On June 22, 2021 Guardant Health, Inc. (Nasdaq: GH) reported that adds two new products to its portfolio to help improve the management of patients with late-stage and metastatic cancers (Press release, Guardant Health, JUN 22, 2021, View Source [SID1234584240]). The Guardant360 Response test represents a breakthrough as the first commercially available, blood-only, liquid biopsy test that detects changes in circulating tumor DNA (ctDNA) levels to provide oncologists an early indication of a patient’s response to treatment . The Guardant360 TissueNext test, the company’s first tissue-based test, is now available, if needed, to help oncologists identify patients with advanced cancer who may benefit from biomarker-informed treatment.
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Both products expand on the trusted Guardant360 portfolio to offer oncologists end-to-end testing solutions, covering treatment selection, with the option of ordering tissue biopsy results if needed, and treatment response monitoring, to help improve clinical outcomes for patients with advanced cancer.
The Guardant360 Response liquid biopsy test detects changes in ctDNA levels from a simple blood draw, to assess treatment response up to eight weeks earlier than RECIST (Response Evaluation Criteria in Solid Tumors),1-11 giving oncologists a new tool to use when considering whether to continue, stop, or explore other treatment options for their patients with late-stage or metastatic cancer. Molecular responders (those with decreasing ctDNA levels) show significantly longer progression-free and overall survival rates, compared to molecular non-responders.1-12 In over 50 studies, Guardant Health has demonstrated that molecular response, as measured by changes in ctDNA levels, can help provide an early indication of treatment response across therapies (targeted, immunotherapy, and chemotherapy) and cancer types including non-small cell lung, colorectal, breast, and bladder.1-12
"Using circulating tumor DNA levels to monitor treatment response is a promising new approach in the management of patients with advanced cancer," said Craig Eagle, MD, Guardant Health Chief Medical Officer. "We are delighted to offer oncologists a simple blood test that can provide an early assessment of whether their patient is responding to treatment, or not. Multiple studies using the Guardant360 Response test have shown that molecular response, as measured by circulating tumor DNA levels, can help predict clinical benefit, and longer progression-free survival."
The Guardant360 TissueNext test can now be ordered, alongside the Guardant360 CDx blood test, to prepare for cases when the Guardant360 CDx test does not find actionable biomarkers. While starting with the Guardant360 CDx blood test to perform complete genomic testing finds nearly 80 percent of patients with actionable biomarkers in only seven days,13-15 compared to finding only 50 percent of patients when starting with a tissue biopsy, and which can take two to four times longer,13-15 there are cases when results are needed from a tissue biopsy. The new Guardant360 TissueNext test offers oncologists the most efficient "blood-first, tissue-next" workflow to complete genomic testing, ensuring that as many patients as possible are identified who may benefit from biomarker-informed treatment.
"With the new Guardant360 Response blood test, we are excited to offer a cutting-edge test able to predict patient response to treatment sooner than standard radiographic assessment, to help inform clinical decisions and improve outcomes," said Helmy Eltoukhy, Guardant Health CEO. "By broadening our Guardant360 portfolio to cover not only treatment selection but treatment response, we provide oncologists a more complete view of their patient’s tumor evolution and resistance to interventional therapies, including immunotherapies. Furthermore, while starting with the Guardant360 CDx liquid biopsy for biomarker testing is shown to be more efficient than starting with an invasive tissue biopsy13-15 which has a longer turn-around time to return results, the addition of our new Guardant360 TissueNext test strengthens our treatment selection offering, by providing oncologists the benefits of ‘blood-first, tissue-next’ testing options to find as many patients as possible, who may benefit from biomarker-informed treatment."
The Guardant360 CDx test, the new Guardant360 TissueNext test, and the new Guardant360 Response test are all part of the Guardant360 portfolio, which provides oncologists a more complete genomic picture across the treatment journey. This comprehensive set of cancer tests empowers oncologists to optimize treatment, and know confidently what to do next. From fast treatment selection, starting first with the FDA-approved Guardant360 CDx test, to reflex testing with the Guardant360 TissueNext test, if needed, to early treatment response monitoring with the Guardant360 Response test, the Guardant360 portfolio helps oncologists unlock the full potential of precision oncology for their patients with late-stage and metastatic cancers.