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Operator
Good afternoon. Thank you for standing by. Welcome to the Guardant Health Second Quarter 2021 Earnings Conference Call. (Operator Instructions) Please be advised, today's conference is being recorded. (Operator Instructions)
I would now like to turn today's conference over to Carrie Mendivil, Investor Research -- Investor Relations.
Carrie Mendivil - Principal
Thank you. Earlier today, Guardant Health released financial results for the quarter ended June 30, 2021.
If you have not received this news release or if you'd like to be added to the company's distribution list, please send an e-mail to investors@guardanthealth.com. Joining me today from Guardant are Helmy Eltoukhy, AmirAli Talasaz and Mike Bell.
Before we begin, I'd like to remind you that management will make statements during this call that are forward-looking statements within the meaning of federal securities laws. These statements involve material risks and uncertainties that could cause actual results or events to materially differ from those anticipated. Additional information regarding these risks and uncertainties appears in the section entitled Forward Looking Statements in the press release Guardant issued today. For a more complete list and description, please see the Risk Factors section of the company's annual report on Form 10-K for the year ended December 31, 2020 and in its other filings with the Securities and Exchange Commission.
This call will also discuss certain financial measures that are not calculated in accordance with generally accepted accounting principles. Reconciliations to the most directly comparable GAAP financial measures may be found in today's earnings release submitted to the SEC. Except as required by law, Guardant disclaims any intention or obligation to update or revise any financial projections or forward-looking statements, whether because of new information, future events or otherwise. This conference call contains time-sensitive information and is accurate only as of the live broadcast, August 5, 2021.
With that, I'd like to turn the call over to Helmy.
Helmy Eltoukhy - Co-Founder, CEO & Director
Thanks, Carrie. Good afternoon, and thank you for joining our second quarter 2021 earnings call. Our mission of Guardant has always been to ensure patients have access to innovative oncology products. Today, the vision is clearer than ever, and I have never been more excited about the opportunity ahead of us. This afternoon, we announced a new leadership structure, which will allow us to aggressively move and scale into new areas of growth across the continuum of cancer care. We have created 2 focused areas within Guardant, Oncology and Screening. AmirAli and I will serve as Co-CEOs, with AmirAli leading our Screening efforts and me leading Oncology. We believe this leadership structure will provide the focus and strategic attention required to continue as the liquid biopsy leader in oncology, while aggressively pursuing the massive opportunity in cancer screening. This structure will also allow for scalability to address new areas across health care beyond screening and oncology.
Everything we do at Guardant is motivated by our commitment to serve patients. We are dedicated to bring the absolute best products to market that will provide clinically actionable information to inform patient care. We believe that this new focused leadership structure will allow us to more rapidly address the unmet need to serve patients.
And in line with these commitments, I will start off today with a patient story. Last March, a 68-year-old woman was diagnosed with colorectal cancer. Shortly after her diagnosis, surgery was performed followed by adjuvant therapy. In follow-up, our oncologist detected elevated levels of CEA, but she can negative for evidence of disease. At another follow-up, just over a year after the initial diagnosis, her oncologist ordered a Guardant Reveal test, which showed a ctDNA negative.
Guardant Reveal directly measures tumor-derived DNA in the blood while CEA is a non-specification and can be elevated multiple cancer types, for example, in smokers and in patients with various benign diseases. Guardant Reveal has a sensitivity of 91% compared to the CEA test with a sensitivity of 69%. With a higher sensitivity than CEA in the surveillance setting, Guardant Reveal showed the patient was not actively progressing. This story highlights how Guardant Reveal can provide confidence and reliability in recurrence testing for cancer.
Now turning to our second quarter performance. Revenue grew 39% to approximately $92 million. Second quarter clinical volume grew to 20,830 tests, representing 52% growth over the prior year period and up 13% from the first quarter of this year. While patients visit in office actions are still not fully back to pre-COVID levels, we are pleased with how well our commercial team is continuing to execute in this environment and still achieve healthy volumes.
International clinical volumes were impacted by the resurgence of COVID cases, especially in countries where the vaccination rates remain low. During the second quarter, we saw strong growth in U.S. clinical volumes as oncology offices gradually reopened throughout the quarter. However, in recent weeks, we have seen a reduction in oncology office visits and sales force access in the United States and across our global business, which may have an adverse impact for the remainder of the year. Although we have started to see some impact globally, we have not seen much yet in the United States. We are monitoring the situation closely as it evolves.
Our portfolio is growing quickly, and we have launched a record number of new products and product upgrades in the last year alone, but we are nowhere close to done. Two of these new product launches were announced in the second quarter, Guardant360 TissueNext and Guardant360 Response, both products expand the trusted Guardant360 portfolio to offer oncologists end-to-end testing solutions. TissueNext supplements our blood-first approach. Our TissueNext test provides an integrated solution for oncologists to use liquid first ahead of tissues, ensuring patients receive guideline-complete testing with the fastest turnaround time. And oncologist orders an integrated product and begins with a Guardant360 liquid biopsy test. If there is no biomarker detected, here she is able to quickly reflex the tissue with TissueNext. This integrated approach has a significantly higher biomarker detection rate than tissue alone.
In the SLLIP study in non-small cell lung cancer, CGP liquid testing using Guardant360 identified 81% of patients with informative test results and tissue testing found informative biomarkers in the remaining 19% of patients. On the other hand, standard of care tissue testing alone identified just 37% of the patients with an informative test results in this study. This study is one of many that highlights a blood-first tissue next approach offers a clinically superior paradigm.
The early response to TissueNext has been very encouraging. The reimbursement path for tissue is well defined, and we expect to submit the technical assessment application to MolDX this year. We believe this offering will serve as a stepping stone for those who continue to rise solely on tissue testing to move towards the blood-first testing paradigm.
Guardant360 Response is the first commercially available blood-only liquid biopsy test that detects changes in ctDNA level to provide oncologists an early indication of a patient's response to treatment such as targeted immunotherapies. Our comprehensive product portfolio essentially enables oncologist to perform profiling for treatment selection in both blood and tissue as well as response monitoring.
Feedback for both new products is very positive. We do not expect either product to be a significant revenue contributor in the near term as we work to establish reimbursement.
Turning to our current monitoring opportunity of Guardant Reveal, we are pleased by the encouraging feedback and reception from oncologists. Based on the early success we are seeing in the market around Reveal, we have expanded this dedicated commercial team. More than 9,000 oncologists have ordered a Guardant360 test and we are leveraging these existing customers as well as our relationship with KOLs for their launch of Reveal. Beyond CRC, we are also making great advances in other cancer types with compelling data on bladder, lung and now breast as well.
Moving on to biopharma. Biopharma volumes grew to 3,653 tests, up 30% year-over-year and up 4% from the first quarter. We continue to experience some pressure in biopharma sample volumes given the lag in many of the samples coming to us for analysis due to slower enrollment during COVID peaks.
Q2 development services and other revenue was approximately $19.5 million, up 27% year-over-year. We are pleased by the growth of our overall pharma business and continue to serve an increasing number of biopharma customers with more than 80 active partnerships. As our biopharma business matures, we expect growth to be underpinned by sample volume, including new product introductions, for example, multi-indication reveal as well as companion diagnostics.
This quarter, we announced 2 new companion diagnostic approvals with Janssen and Amgen, both for use in advanced non-small cell lung cancer. The FDA has approved the Guardant360 CDx test as the first and only liquid biopsy companion diagnostic for comprehensive genomic profile to identify patients with locally advanced or metastatic non-small cell lung cancer who harbor the KRAS G12C mutation and who may benefit from Amgen's LUMAKRAS or who harbor an EGFR exon 20 insertion mutation who may benefit from Janssen's RYBREVANT.
Moving on to GuardantINFORM, our real-world evidence platform, featuring an extensive clinical genomic liquid biopsy data set of advanced cancer patients. We have signed more than a dozen biopharma collaborations for GuardantINFORM since its launch just over a year ago. We are pleased with the success in growing interest from our biopharma partners in this offering.
At Guardant, our sitter set not only in providing solutions for patients with advanced and early-stage cancer but early cancer detection as well. We are focused on establishing ourselves as a best-in-class company in these large markets while maintaining a culture of fast execution as the organization continues to scale. Since founding Guardant, AmirAli and I have always had a strong partnership and we've been laying the groundwork for these 2 focused areas of oncology and screening for quite some time.
This Co-CEO leadership structure is a continuation of our current strategy and supports the evolution of our business. We are scaling the team to support the growth of both businesses and recently brought on Chris Freeman as our new Chief Commercial Officer of Oncology. We expect to bring on several more key leaders in the near future and have started building a dedicated commercial organization for our Screening business.
Having leadership teams dedicated to each opportunity will give us the focus and velocity to rapidly scale in each of these areas to drive both near term and long-term success. We have also continued to invest in our governance and made recent changes in additions to our Board of Directors. I will now be serving as Chairman of the Board, and AmirAli will continue to serve on the Board as a Director. We believe this rotation and responsibility adds a fresh perspective and is in line with our overall focus to scale our organization.
In addition, Meghan Joyce has been appointed to our Board of Directors. Meghan is the Chief Operating Officer and Executive Vice President of Platform at Oscar Health, a high-growth health tech and health insurance company, where she leads operations, technology, clinical, marketing and new business lines. Prior to joining Oscar Health, Meghan had several leadership roles at Uber, most recently as Regional General Manager of the United States and Canada. Her expertise in scaling high-growth organizations will be invaluable to our next phase of growth. We look forward to her contributions and guidance.
We are committed to continue to develop a portfolio of breakthrough products across all stages of cancer and ensure these innovations are not only available but readily accessible for all patients. We look forward to continuing to expand our product portfolio, attract and develop top talent and improve patient outcomes as we conquer cancer with data across the continuum of care.
I will now turn the call over to AmirAli.
AmirAli Talasaz - President, COO & Chairman
Thanks, Helmy. I want to start by echoing Helmy's excitement for what is ahead at Guardant. Early cancer screening has the potential to significantly transform patient outcomes. The successful readout of our ECLIPSE trial will potentially open up a $20 billion screening opportunity in colorectal cancer. And future studies will open up opportunities in additional cancer types, paving the way towards a total addressable screening market of more than $50 billion.
We are confident that we will become the leader in screening, not just in CRC, but across many cancer types. That said, it is clear that this opportunity requires a dedicated and focused effort. I'm thrilled to assume the role of Co-CEO as we position ourselves for the launch of our Screening business. We are encouraged by the progress in the CRC indication, and this is just the first of many indications we will pursue for Screening.
I'm excited to announce that we have recently enrolled the 10,000th patient in our ECLIPSE trial. I'm proud of the progress our clinical team made in running this study during the pandemic when enrollments in many clinical trials were heavily impacted. Now based on the CRC prevalence that we've seen ECLIPSE so far, we plan to enroll an additional 3,000 patients in this study for a total of 13,000 to ensure we reach the required number of CRC positive patients. We are confident that we will have total enrollment completed by November of this year, the same 24-month time frame that we announced when we launched the ECLIPSE study.
In parallel to running ECLIPSE, we are also making great progress building our commercial infrastructure to launch our Screening product. I am pleased to announce that we are planning to launch the LDT version of our CRC screening assay in the first half of 2022, and we expect to launch the IVD version of the assay in 2023, pending successful FDA review and approval.
The initial version of our screening test will be for CRC and we expect, over time, more indications will be added to the assay. We have presented data and are continuing to see good technical performance in detecting early stage lung, bladder, pancreatic and a few other cancer types in pilot cohort studies. Part of our strategy is to invest in adjacent areas or emerging trends that are synergistic to our efforts in screening.
To that end, we have recently partnered with LUNAR, a company focused on AI-powered radiology and pathology solution with the vision of streamlining the screening journey for patients. We believe that a multi-model and integrated screening paradigm can offer tremendous value to the health care system and patients. This is an important aspect of our overall strategy and we will continue looking for strategic opportunities over the coming quarters.
Turning to clinical data. At this year's ASCO Annual Meeting, we presented about 20 abstracts covering our full suite of products. I would like to highlight a few of these abstracts today. In an MRD study led by UCSF in oligometastatic CRC patients, Guardant Reveal was used to analyze post-procedure ctDNA in serial blood samples in 46 patients. Positive predictive value of positive post-procedure ctDNA to predict recurrence was 96%. And on average, ctDNA was detected 28 weeks before radiographic recurrence, mean of 17 versus 45 weeks, respectively.
Pfizer also presented data leveraging Guardant360 to assess ctDNA dynamics as a predictor of early response. In newly diagnosed advanced non-small cell lung cancer patients treated with lorlatinib, Guardant360 was able to discern molecular responders from nonresponders 4 weeks after the startup therapy and molecular responders had significantly longer progression-free survival.
We also reported clinical outcomes from patients in the NILE study. Patients who received target therapy based on their Guardant360 result at comparable outcomes to those treated based on tissue results. Importantly, time to treatment in ctDNA cohort was significantly shorter compared to the tissue cohort, 18 versus 32 days, respectively.
Lastly, in another abstract covering early-stage cancer management using cancer-specific genomic and epigenomic signals, we showed the performance of our liquid assay for detecting the presence of ctDNA in early-stage non-small cell lung cancer and bladder cancer patients. The assay performance was tested using 175 pre-treatment clinical samples from patients with early-stage disease and 171 healthy, clear healthy donors. Sensitivity for non-small cell lung cancer was 70%; stage 1, 56%; stage 2, 80%; and stage 3, 83% and sensitivity for bladder cancer was 51%; in non-muscle invasive, 36%; in muscle invasive, 69%; with 95% specificity. These abstracts demonstrate the value and utility of liquid biopsy across the continuum of cancer care.
With that, I will now turn the call over to Mike for more detail of our financials.
Michael Bell - CFO
Thanks, AmirAli. Total revenue for the second quarter of 2021 was $92.1 million, up 39% from $66.3 million in the prior year quarter. This growth was driven by a year-over-year increase in both our precision oncology testing revenue and our development services and other revenue.
Total precision oncology testing revenue for the second quarter was $73.6 million, a growth of 43% compared to $51.0 million in the prior year quarter. Precision oncology revenue from clinical tests in the second quarter was $61.1 million, up 54% from $39.6 million for the prior year quarter.
Second quarter clinical test volume, which primarily consisted of Guardant360 tests was 20,830, which is an increase of 53% from the prior year quarter. In the second quarter of 2021, the average estimated ASP for Guardant360 CDX and LDT test was approximately $2,600, which was in line with our expectations, following the April 1 increase to $5,000 of the medical reimbursement rate for Guardant360 CDX and the partial offset from potential payment delays or denials of the new Guardant360 CDX ADLT code from private payers. For the remainder of 2021, we expect the estimated ASP for Guardant360 CDX and LDT test to continue to average approximately $2,600.
Note that the clinical revenue recognized in the second quarter of 2021 consists of accrued revenue of tests performed during the period based on the estimated ASP as well as cash collected the tests performed in prior periods where the cash collected was greater than the previously accrued revenue. As our ability to estimate the ASP for Guardant360 continues to improve due to our growing historical collection data, we expect clinical testing revenue for the second half of 2021 to be primarily derived from accrued revenue for tests performed in the period based on estimated ASPs. And therefore, the amount of revenue recognized from cash collected for tests performed in prior periods will be significantly lower than in the first half of 2021.
Precision oncology revenue from biopharma test in the second quarter totaled $11.6 million, up 2% from $11.4 million for the prior year quarter. Second quarter biopharma test totaled 3,653, up 30% from the prior year quarter. Biopharma test ASP was $3,153, down 22% from $4,054 in the prior year period, primarily due to the mix between our OMNI and G360 test.
Development services and other revenue continue to be a strong growth driver and in the second quarter totaled $19.5 million, up 27% from the prior year quarter. Development services revenue included milestone payments for the 2 FDA companion diagnostic approvals we received in the second quarter of 2021.
Gross profit for the second quarter of 2021 was $62.2 million compared to a gross profit of $43.9 million in the same period of the prior year. Gross margin was in line with our expectations. And in the second quarter 68% compared to 66% during the second quarter of 2020.
Operating expenses for the second quarter of 2021 were $159.8 million, an increase of 62% compared to $98.5 million in the second quarter of 2020. Non-GAAP operating expenses excludes stock-based compensation and related employer payroll tax payments, acquisition-related expenses, amortization of intangible assets, and changes in fair value of contingent consideration.
Non-GAAP operating expenses for the second quarter of 2021 were $124.7 million, a 71% increase from $72.9 million in the second quarter of 2020. We expect operating expenses to continue to accelerate in 2021 as we invest in our LUNAR program, ECLIPSE study and other development activities as well as expand our commercial organization, both in our Oncology business, where we have launched several new products so far this year and in our Screening business, as we prepare for the planned launch of the LVT version of our CRC screening assay in the first half of 2022.
Net loss was $97.6 million or $0.96 per share for the second quarter of 2021 compared to $54.6 million or $0.57 per share in the second quarter of 2020. Non-GAAP net loss was $61.4 million or $0.61 per share for the second quarter of 2021 compared to $23.5 million or $0.25 per share for the second quarter of 2020.
Adjusted EBITDA was a loss of $56.4 million in the second quarter of 2021 compared to $25.1 million loss in the second quarter of 2020. We define adjusted EBITDA as non-GAAP net loss adjusted for interest, income tax, depreciation, amortization and other income and expense. We ended the second quarter of 2021 with $1.8 billion in cash, cash equivalents and marketable securities.
Now turning to our revenue outlook for the full year 2021. While we feel bullish about the trajectory of our business and against our record revenue this quarter, we want to be cautious given the uncertainty around the impacts of COVID-19 and in particular, the delta variant on oncology office visits, clinical study enrollment and sales force access in the U.S. and across our global business. Thus far, we are maintaining our guidance of $360 million to $370 million, representing growth of approximately 27% over 2020 at the midpoint of the range. We continue to expect clinical sample volume for 2021 to be greater than 90,000 tests, representing growth of at least 42% over 2020.
At this point, I would like to turn the call back to Helmy for closing comments.
Helmy Eltoukhy - Co-Founder, CEO & Director
Thanks, Mike. Before closing, I want to thank our team for their incredible work this quarter as we work to establish ourself as a leader in cancer across the continuum of care. We have made great strides this year as we continue to expand our product portfolio and establish our solutions as a class in cancer testing. We are looking forward to bringing the strong momentum into the second half of the year.
With that, we will now open it up to questions.
Operator
(Operator Instructions) And our first question will come from the line of Tycho Peterson with JPMorgan.
Ruizhi Qin - Analyst
This is Julia on for Tycho. To start off, maybe you can spend a little bit more time on the new leadership structure. Obviously, we all understand that Screening is a different animal from Oncology in terms of reimbursement time line, go-to-market channel, et cetera. So would this leadership structure change, like what specific operational changes can we expect for the cancer screening business, especially in terms of resource allocation and financial reporting? I know you touched on commercial team expansion as a major part of it. But are there any meaningful changes in the OpEx outlook or the long-term strategy we should be thinking about. And Helmy, I think you mentioned in the beginning that there are potential opportunities beyond Screening and Oncology. So just wondering if you could elaborate a little more what specific opportunities you could be seeing?
Helmy Eltoukhy - Co-Founder, CEO & Director
I'll start and then I'll let AmirAli kind of fill in on the Screening side. But this is really a culmination of changes and evolution of the organization that has been ongoing for the last several years. And I think it really is a testament to the constants we have around screening, around our separate businesses and then scalability of the future that we want to set up. I'll let AmirAli talk a little bit about the Screening side of things.
AmirAli Talasaz - President, COO & Chairman
Yes. Thank you, Helmy. So I'm thrilled that this additional responsibility, and I believe it will generate actually additional focus, additional share of attention for both of us through run Oncology and Screening while there are a bunch of corporate matters that are beyond these 2 businesses that we are going to continue to best as we as always, be very close partners and still operate under one Guardant entity business operation that we have, just trying to make sure we have more focus and dedication across different business lines that we are going to run.
Helmy Eltoukhy - Co-Founder, CEO & Director
I think in terms of the second part of your question, I think this structure also allows for scalability beyond the areas that we are targeting today. We're not making obviously any announcements around those areas, but we do know that our platform really had the legs and I think the capabilities of addressing other areas of health care, but more to come in the future.
Ruizhi Qin - Analyst
All right. I guess we'll stay tuned. And then separately, I have a question on the G360 Response test. Just curious, since you already have Reveal, what's the rationale for launching Response as a separate test instead of having a single quantitative MRD test? And then a related note, I've got several clients asking this, does the Response test cause any cannibalization on G360?
Helmy Eltoukhy - Co-Founder, CEO & Director
So Response is really, I think, a very well-targeted product. If you think about therapeutic response, most targeted immunotherapies are really targeted towards the advanced cancer patient market. And so to really conflating 2 different animals that don't belong MRD and therapeutic response. So this is absolutely the right product for the field. We're seeing really a lot of excitement in terms of the launch of this test. We have a wealth of data over 40 publications that really support the science and the clinical utility and clinical ability of this application. And it's really part and parcel to I think what we laid the groundwork for now, I think, over 5 years ago in terms of our tumor response lab, you make a decision, a physician makes a decision in terms of which treatment to put advanced cancer patients on. For many reasons, the current standard of care is less than stellar in terms of determining and understanding whether that patient will respond or not, especially to therapies like immunotherapies.
And Guardant Response can come in and just a few weeks later, essentially that test is able to help with adjudication determination of that patient is indeed responding -- they're responding or not. So it's a fantastic product that sits squarely in kind of the unmet need that exists today in the advanced cancer patient market. So we actually see it as an amplification of our current products, not a cannibalization in anyway.
Operator
Our next question comes from the line of Doug Schenkel with Cowen and Company.
Doug Schenkel - MD & Senior Research Analyst
Just going back to the leadership structure change. Clearly, the opportunities are large here and complex even acknowledging that, this leadership change is, it's a bit unusual, especially in this space. Again, I know the opportunities are big. But I mean, we could get on the list of bigger, more diversified growth companies in life science tools and diagnostics and none of them have this structure. And this includes very successful companies like Thermo, Dana or Agilent, just to name 3. And I could probably name 15 to 30 more.
So recognizing part of leading a company is being decisive and nimble and ultimately having one person at the helm, what precedent can you point to that supported this decision? How did the Board make a decision that this was the right thing to do when no one else in the space has. And often -- and this is really important, Co-CEO structures lead to eventual single CEO structures. Usually, these are temporary, when we've seen them in other areas. Helmy, this seems like it could be a sign that you're likely to leave the CEO role at some point relatively soon. Are you committed to this current role through 2022? This seems very, very important, given how many clinical readouts and how many product launches you plan for that time period.
Helmy Eltoukhy - Co-Founder, CEO & Director
Yes, just to put it kind of bluntly, I'm not going anywhere. And I'm firmly committed to Guardant. As it is -- AmirAli and I -- it would be crazy to leave when we have so much opportunity to address so many patients. I don't see another opportunity, frankly, in existence that could really match what we have on our plate. I think this is really an acknowledgment of how much focus, how much mind share it really takes to win, to succeed in these ambitious areas where we're addressing. I mean we're addressing 3 areas of oncology that have been grandstanding challenges for -- outstanding challenges for decades. And it takes a really singular focus to really open up these huge TAMs that exist in each one, $20 billion to $30 billion TAMs, $50 billion TAMs. And with duress, all the respect to some of the companies you listed, I don't think they're necessarily solving some of these complex challenges we're addressing here.
No one thought that liquid biopsy was a viable technology when we started Guardant and there is a lot in terms of how we've succeeded in the past that is bucking -- it's about bucking the trend and doing what is right for the business and what is right for patients regardless of tradition or what has been done in the past.
Doug Schenkel - MD & Senior Research Analyst
Okay. Super helpful. And I appreciate you giving us a little bit more on the thinking behind this. Now maybe just for a couple of more near term questions. And I'm sorry if I missed this in your prepared remarks. I understand that guidance factors in the reality of the environment we're in, that there is still some uncertainty as it relates to what's going on with COVID and specifically the delta variant. And recognizing that, I'm wondering if you can say anything about what you saw over the course of the quarter and what you've seen in the early part of the second half of the year in terms of ordering activity and your ability for the sales force to actually get in detail clinical practices.
Helmy Eltoukhy - Co-Founder, CEO & Director
Yes. I think as we mentioned in our remarks, we actually saw improvement during the quarter. We saw offices opening up. We saw more access, which I think is part of the driver in terms of the strong quarter that we had in Q2. I think what we've started to see is, especially in the last few days, some of these offices are starting to restrict access or starting to close back up. And that's not surprising given where really the number of cases are per day now in the United States, how fast things are rising. And so some -- it's certainly something that despite the strong progress we're seeing, the momentum we're seeing, we wanted to be, I think, cautious in terms of the second half of the year because we're still in the summer months, and who knows what will happen especially in the winter. Mike, is there anything you wanted to...
Michael Bell - CFO
Well, maybe just I will reiterate. Where we did see a little bit of impact was in the international business. And of course, that's not the large piece of our business, but we saw impact there. And again, I think we see continued uncertainty internationally as well. So again, just another reason why we've maintained the guidance where it is.
Operator
And our next question is going to come from the line of Tejas Savant with Morgan Stanley.
Yih-Ming Tu - Research Associate
This is Edmund on for Tejas. The first question I had was on MRD. And given that the beta around the tumor informed and tumor agnostic assays, Helmy, can you provide us with some quantitative color on how the mind share battle is progressing? I guess in a simpler term, is there any way you can give us some information on how many of your new ordering physicians will be able to respond that formerly they've been using other MRD tests?
Helmy Eltoukhy - Co-Founder, CEO & Director
Yes. I think we continue to see good traction. It's just very logistically a straightforward test that really fits in to how physicians currently order tests like CA and how they practice medicine. It's something that I think we've been very pleased by the traction we've seen with the Reveal. We continue to be pleased. There are a number of KOLs, who, I think, have talked publicly in various forums, both in the U.S. and internationally about the challenges with tissue acquisition, even in the early-stage cancer setting and how having a really tissue-independent approach is one that is, I think, really simplifies some of those -- and addresses some of those challenges that exist.
In terms of -- it's obviously hard to give exact numbers, but we really do not see a lot of pushback, whether or not physicians have been -- existing or new users to these types of tests. And so we're very pleased by the traction that Reveal is seeing by the reception that we're seeing really all classes of physicians that we have been in front.
Yih-Ming Tu - Research Associate
Got it. And I'm sorry if I missed this, but can you remind me on the time line for reimbursement and the plans to launch in indications beyond CRC?
Helmy Eltoukhy - Co-Founder, CEO & Director
So I think we've mentioned before that we expect reimbursement by end of the year or at least on the Medicare side. Private payers, I think will take some time as some of the utility studies readout most likely. In terms of multiple indications, it's something that should happen relatively soon. It's -- we have -- data that we've presented at ASCO that shows, I think, the progress we've made and the excellent results that we're seeing with the platform beyond CRC, presented data in bladder and lung, that's very compelling. And I think we've mentioned in the prepared remarks, a data on breast as well. So we expect to see them in the coming quarters.
Yih-Ming Tu - Research Associate
Got it. And one last one from me on ECLIPSE. Maybe Amir, you guys have showed data on cancer patient populations at ASCO. And first, is it still right to think about readout timings for early next year? And second, in terms of the bogey for the ECLIPSE world data, how should we think about this in terms of the cancer patient population data presented at ASCO?
AmirAli Talasaz - President, COO & Chairman
Yes. So as we mentioned in script, we expect that we will finish the enrollment by November, the original time frame that we had from the beginning with all the up and downs that we have in this stunning and strolling pandemic. I'm very pleased with that, even with additional 3,000 patients. And right after that, I think after a few months, after readout of ECLIPSE, as we mentioned before, still we are on track to be ready to run new samples when study ended.
In terms of data, we presented in ASCO, we continue data generation, and shot forward to get access to additional CRC cohort, cancer screen cohort negative or positive findings. We are continuously pleased with the data. I think we updated our data like across cohorts for over 1,000 cases are around 1,300 patients that we showed in ASCO, data holds up. But there is some kind of uniqueness in the ECLIPSE in terms of being the prospective screening study, 13,000 patients that we find 60, 70 CRC being down. Nothing can replace that. We continue to always technically derisk actually the finding of ECLIPSE. But at the end of the day, we have to run ECLIPSE and see what we're going to see there but we feel good about it. And I think I would tell that we feel pretty good about it.
Operator
And our next question will come from the line of Brian Weinstein, Morgan Stanley (sic) [William Blair].
Brian David Weinstein - Partner, Group Head of Life Sciences & Healthcare Analyst
No, just in case anybody is curious, I'm still William Blair. It's all good. So a couple of questions for you guys going back to the new leadership structure here. I definitely heard the questions from Tycho and Doug, but just kind of wanted to dig in a little bit here. I get why you want to do this, but I am curious about things like decisions on deployment of capital, decisions on other kind of corporate matters. Who's in charge really? I mean at the end of the day, where does the buck stop on kind of setting that broader strategic decision-making? With the Co-CEO structure, it's not clear to me kind of who is at the end of the day really healthy countable for broader corporate performance?
Helmy Eltoukhy - Co-Founder, CEO & Director
We've always had a strong partnership between myself and AmirAli since the founding of Guardant. I think it's pretty clear. Things are on Screening. AmirAli will be in charge of decisions around Oncology, I will be in charge of. And we're still having essentially combined leadership structure around other areas. And obviously, some of those decisions rise to the Board level as well, which is heavily engaged at Guardant. So I really see no issues or not a lot of deviation from where things were in terms of business structure. So we're very confident that all of those strategic decisions will continue to be made in the context of one Guardant in the very one mindset.
Brian David Weinstein - Partner, Group Head of Life Sciences & Healthcare Analyst
Okay. And then as it relates to the CRC screening product, the LVT approach, we haven't really seen that before. Can you talk about -- obviously, you get into market a little sooner, but is there any other kind of strategic rationale in terms of data collection or other things that would cause you to kind of go with that LVT approach? And then are you willing to kind of talk about what your updated expectations are for performance of the assay from -- in terms of an early -- in early-stage detection as well as advance adenoma where you think you guys could potentially come in on both of those.
Helmy Eltoukhy - Co-Founder, CEO & Director
Thank you for asking about the LVT and the rationale behind it actually we're still expecting actually this does hopefully that this goes on to other review in 2023. And that would be the major commercial push for us. But couple of years before that, it would be very important for us to branch the market, start shaping the market the way that we believe blood-based screening could add social impact that can impact outcomes for the patients in the right way.
Generate experience for the field, integrating our test with right health networks, generate experience for people and really add this blood-based screening into a bunch of PCP workflows and in some of our key accounts. So it's a very strategic move for us. On the CRC side, I don't believe like some of the real-world evidence which maybe add much into -- really, I don't see any data gap that real-world evidence would steal in terms of the CRC data, I think ECLIPSE would be very comprehensive by itself, bunch of other ISPs that we've done, and we are continuing to do are really sufficient.
It could have some incidental finding for other cancer types and generate some evidence for non-CRC findings for us. For CRC, we feel comfortable. In terms of performance, all the data that we've seen different cores, independent or in partnership with different cancer centers and KOLs and PIs, we have published them in different conference presentation. We're going to continue to do so.
You asked about advanced adenoma, that's an area that actually we look into extensively. While we believe that maybe the performance of advanced adenoma is not required for FDA approval potential like Medicare reimbursement based on the MCB, but we do believe that performance is important for commercial adoption of the test and expansion of the TAM. As the result, we're looking to finding surrogate biomarkers in blood that can have a good sense on advance adenoma in right conference setting. We are going to show some performances hopefully there. So -- but it's an area that we have looked at for some time.
Operator
Our next question will come from the line of Derik De Bruin with Bank of America.
Juan Esteban Avendano - Associate
This is Juan on for Derik. I wanted to ask about the ASPs, the clinicals. With all these new product launches, do you see the ASP for clinical going up in 2022?
Michael Bell - CFO
Yes, it's Michael. No, I think when we look at the clinical ASP, and we were very explicit in their prepared remarks, we talked about ASP for Guardant360 and so for Guardant360 CDx and LDT, now this quarter, it's 2,600 on the back of the ADLT change. And we expect that to be the same for the remainder of the year. Of course, we're launching new products and reimbursement is going to take time. So we take the overall clinical volume and revenue than the ASP overall is probably going to go down because we're not getting paid for some of the tests. But for Guardant360, it should at least remain where it is. And if we can let from the private payers with the new ADLT than we previously expected, there is some potential for some upside there.
Juan Esteban Avendano - Associate
Got you. And then you mentioned that the international market, the sequential decline in revenue that was delta. But going forward, how do you see that growing? And back in the domestic, like what percentage of the visits are in person? You mentioned last quarter that it was around 30%, 40%. I'm wondering how much improvement there is in?
Michael Bell - CFO
Yes. Maybe just on the international, I don't think we said it was sequentially down. What we said is that we saw an impact. And I think we were more referring to the impact on the growth rather than a decline. So we're still seeing strong performance internationally. But we've continued to see an impact because we're in many different countries and the impact across those countries, it varies. And again, it makes an impact to our ability to grow the business. But yes, it's not a sequential decline.
Helmy Eltoukhy - Co-Founder, CEO & Director
Yes, I think things improved from the 30%, probably reached at least 50% or more than started opening up, and it was going in the right direction. But obviously, we're seeing things now close the back up. I mean I think yesterday, there are 150,000 new cases in the U.S. So clearly, I think there's a lot of justified risk in the part of clinicians given the impact of the cancer patients and breast cancer patients of this disease.
Operator
Our next question will come from the line of Patrick Donnelly with Citi.
Patrick Bernard Donnelly - Senior Analyst
Great. AmirAli, I just wanted to follow up on one of the prior questions there. I think it was Brian, was talking about the LDT launch. Have you guys kind of carved out a type of population you think will be addressable with this launch relative to the overall pie coming with the IBD launch? I know other companies that have done LDT launches have carved out a tranche where they feel is addressable with the LVT. Just curious your guys' perspective on that.
AmirAli Talasaz - President, COO & Chairman
Yes. So it is still a population even for LDT launch would be average risk population. Having said that, we don't expect like major adoption before FDA approval. We believe that staff of FDA approval, we believe, getting multiple coverage policies would continue to help. We did adoption of the test especially on the mainstream adopter. But we do believe there are a lot of opportunities with early adopters and people who are really interested in a bunch of people that we are working with. They really want to use our test even sooner than later. So we are kind of responding to some extent on the market demand too. But now that we are carving out and going just after, let's say, high-risk patient population, of course, we don't have that strategy yet. At this time, we're kind of going to market still with average risk indication with the offerings that we have, but we are going to see that the way market would react to the data package that we are kind of putting on all the evidence that we have generated during last few years.
Patrick Bernard Donnelly - Senior Analyst
Okay. That's helpful. And then, Helmy, I know you mentioned you've seen some offices closing back up over the last couple of weeks. But do you feel better prepared to weather another, let's say, partial shutdown? I mean, are there learnings from the first time around that will help you guys insulate volumes better if this continues to worsen and offices close up. I'm just curious if you think the impact this time around would be less, given we all learned something from the first time around?
Helmy Eltoukhy - Co-Founder, CEO & Director
Yes. I mean I think -- certainly, I think our ability to interact remotely with clinician offices. So we've really built lot of capabilities in that area. We've built that muscle. I think the question would be more kind of speed of growth and so on and how that could be impacted -- obviously -- all of it depends on the severity of delta and there's other variants that come around. But yes, I don't expect kind of what happened in Q2 of last year around the industry where people got paralyzed would happen again. I think we're all living to -- we're all learning to live, I think, with the disease in the background to some extent.
Operator
And our next question will come from the line of Dan Arias with Stifel.
Daniel Anthony Arias - MD & Senior Analyst
AmirAli on ECLIPSE and just expanding the study to 13,000 enrollees. Anything you can touch on there just in terms of the need for that move. You guys aren't the first company to take the population up for a trial like this. So just kind of curious if it's total overall colorectal cancer patients that you need to increase the number of. Is it related to subpopulations by stage? Or is it something else altogether?
AmirAli Talasaz - President, COO & Chairman
Yes, it's related to the number of CRC that we need to find in that study. You can think about it like an event-driven study that there are some -- certain number of CRCs we need to find in this patient population that we are screening in our first study to be powered to make the claims that rehab as part of that success criteria. So there is a minimum number of CRC patients that we need to find.
When we started the study based on the prevalence of CRC new at that time, our calculation shows in our study, we need 10,000 patients. And as we've enrolled more and more patients and we started actually getting some reports on number of events that we had, we are effectively like fine-tuning the number based on the most recent actual prevalence that we are seeing in this study. That's why the study is going from 10,000 to 13,000 to find the additional CRCs that we need to find. That's the driver of enrolling mark ready.
Helmy Eltoukhy - Co-Founder, CEO & Director
But we see it as still certainly in line with where we thought things could play out and then certainly going to conclude in our view within the time lines we initiated when we first started. So I think we're very pleased by where we are. We couldn't be more thrilled.
Daniel Anthony Arias - MD & Senior Analyst
Yes. Okay. And then just maybe, Mike, on the mix between OMNI and G360 on the pharma side, what direction do you think that split heads in the coming quarters? Obviously, that's got an implication on the ASPs there going forward.
Michael Bell - CFO
Yes, in this quarter, we definitely saw risk weighted more towards the 360. I think as we look for the remainder of the year, we'll probably double correct a little bit. And I think our forecast is probably coming back more on the OMNI side. And so we're expecting the ASPs to improve a little bit because it will further analyze this quarter. But a lot also depends on the pipeline and the sums that we get through the door as well, but that's how we're looking at it.
Operator
Our next question comes from the line of Matt Sykes with Goldman Sachs.
David Graves Delahunt - Associate
This is Dave on for Matt. Congrats on hitting 10,000 patients in ECLIPSE, very exciting as well as the LUNAR-2 launch next year. You've been very successful in oncology testing, screening is an even bigger opportunity, of course. Could you tell us more about your strategy for ramping sales and marketing to reach the hundreds of thousands of PCPs out there?
Helmy Eltoukhy - Co-Founder, CEO & Director
Yes, sure. So we talked about it a little bit before, too. We started actually building the leadership of our commercial channel and screening side a few quarters ago. And now I'm happy to actually be like couple of layers of that leadership already in place. It's a dedicated leadership on Screening side at the highest level. It was our internal executive that we had on oncology side that took the responsibility of leading the commercial efforts on screening side, very talented individuals that we are really excited about having in. And now we have next layers of leadership in place. As we speak, we are building the next layers to be ready for this LDT launch, and we believe we are going to have commercial and all operational infrastructure that we need to support this LDT launch first half of next year.
David Graves Delahunt - Associate
Fantastic. And could you tell us a little more about the AI-powered pathology partnership that you announced for a multimodal screen?
Helmy Eltoukhy - Co-Founder, CEO & Director
Yes. So the company that we have partnership with is called Lunit. They're an AI comprehend in radiology and pathology. Very strong team with very heavy experience on AI sites, especially on the image processing. And they have already have some regulated products in radiology side that helps with the product, we can improve productivity of the radiologists in reading different kind of scans from different kind of scanning modalities. And when you think about what would be the future of screening, we believe this has -- the blood-based assay are very important, but cannot be the only assets there to really streamline screening journey for the patients.
So we envision obviously a multi-model solution out there that starts with and care point would be blood-based screening but there would -- we need to put some kind of additional solution on the front end and back end to really have a great experience and workflow for patients and providers to really take -- open up the opportunities that blood-based screening can offer in the field. So we are very excited about that partnership. We're going to work with them to see how much we can shape actually the future activities for them to really help us on the screening side.
Operator
And our next question will come from the line of Jack Meehan with Nephron.
Jack Meehan - Research Analyst
I was wondering if you could comment on how much Guardant Reveal added in the quarter in terms of volumes and we're waiting on the Medicare final LCD for MRD. Do you think there's a chance that could be included in that?
Michael Bell - CFO
Yes. I mean there is a final LCD for CRC. And I think the one that is still in draft is the one that extends that -- and extend that to application of the molecular response as well. And so yes, that is obviously going to happen later this year in terms of the finalization. But that's obviously up to them in terms of their time lines.
Helmy Eltoukhy - Co-Founder, CEO & Director
Yes. On the volumes, obviously, we're not splitting out the specific Reveal volumes for competitive reasons amongst other things. And we did say in the prepared remarks that the vast majority of the samples in the volume that we reported were Guardant360. I think what we would say again, is that the Reveal's launch has gone as well as we could have expected, and we're really pleased with it. So the volume side are coming through the door as good as we expected. And we continue to see them grow. But we're not going to be breaking that out specifically.
Jack Meehan - Research Analyst
Great. And then just one math question. Sorry, juggling a few earnings points. Sorry if this is a dumb question. But you had $61 million of clinical sales, 20,830 tests. My math was going at $2,900 price point. I know you quoted $2,600. Is there some other dynamic that I missed?
Helmy Eltoukhy - Co-Founder, CEO & Director
Yes. I tried to explain that in the prepared remarks. But maybe I didn't do justice the way that we recognized revenue in the past, there's always been a large sort of cash collection component from samples from previous periods included in revenue. We're moving more and more to having our revenues just purely based on the accrued revenue from the samples in that quarter. So there's still some cash in the Q2 number from prior periods, and that's why your math is off a bit.
Operator
And our last question will come from the line of Andrew Cooper with Raymond James.
Andrew Harris Cooper - Senior Research Associate
A lot has been covered. But maybe just first, when we think about the screening commercial sales force you intend to build and the sort of time line on LDT to FDA. Can you help us a little bit more think about -- obviously, it's early today, but where do you want to be in the first half when you're launching that LDT and then where you want to be again when we think about the timing for the FDA approval? So just sort of what the stage gate looks like would be helpful.
Helmy Eltoukhy - Co-Founder, CEO & Director
So a lot of success metrics for us during this LDT period is making sure that actually we can build strategic relationship, get into workflows and really build a bunch of power metrics more than like volume metrics. So -- and we would be ready that once FDA approval comes, in fact, all the infrastructure and workflow integration, actually, we have built during this period of time would take us to the maximum opportunity that blood-based screening can offer, much faster than without this LDT experience.
Having said that, we think there is good opportunity with like early adopters and like really this technology and enthusiastic that based on the data that they've seen, in fact, they want to get their hands on this device and start using it clinically. But our main goal, as I mentioned, is for this LDT early launch, is to build much a power metrics and make sure we are well integrated into PCP workflows and any network system.
Andrew Harris Cooper - Senior Research Associate
Okay. Great. And maybe just one more, if I could. On Lunit again, just thinking about sort of the multimodality, I just want to make sure you're kind of thinking about the way you are viewing this appropriately. They've got Scope IO that is more on the immuno-oncology side and then more of the kind of traditional radiography type tools as well. So is this something you envision on the front end with the IO piece or maybe the back end in terms of reflexing from a multi-cancer test. How do we think about where this fits into the Guardant pipeline?
Helmy Eltoukhy - Co-Founder, CEO & Director
I would maybe encourage you to maybe stay tuned a little bit. And we are excited about this partnership and we have our origin of how this multimodal integrated radiology blood testing would really shape the future. Let us go through that process, and we would keep you post about the progress that we make just tell you that we are very excited about this future and the way screening can get streamlined for the patients in oncology and potentially than other diseases.
Operator
Thank you. And with that, we have no further questions, and we would like to thank everyone for participating on today's Guardant Health Second Quarter 2021 Earnings Conference Call. This concludes today's conference call, and you may now disconnect. Thank you.