“Scientists are stepping up the hunt for better diagnostic tests to predict if cancer patients will benefit from costly modern immunotherapy drugs, which are transforming cancer care but remain a hit-and-miss affair.
“Research presented at Europe’s biggest oncology congress in Madrid adds to evidence that patients with an above average number of genetic mutations in their tumors have a better chance of responding to the new treatments, and drugmakers are racing to confirm the idea.”
University of Colorado Cancer Center | Sep 6, 2017
“For many years, oncologists have known that cancers can secrete complex molecules into the blood and that levels of these molecules can be easily measured. These so-called ‘tumor markers’ are traditionally associated with a single dominant cancer type, for example Prostate Specific Antigen (PSA) linked to prostate cancer, Carcinoembryonic antigen (CEA) to colorectal cancer, CA125 to ovarian cancer, CA19.9 to pancreatic cancer and CA27.29 to breast cancer. However, the real challenge has been to determine a practical use for these markers. They don’t appear to be useful as a means of screening otherwise healthy people for evidence of underlying cancers.”
“The boom of blood-based biomarkers has led to a turning point in clinical practice for physicians treating patients with non–small cell lung cancer (NSCLC). While tissue biopsies remain the standard approach, plasma assays—if positive—can direct patients to a first-line targeted treatment quicker.
” ‘Blood-based testing does have a role in patients with NSCLC,’ said Leora Horn, MD, MSc. ‘The blood can be potentially used as a surrogate for markers for directing for therapy. But if blood testing is negative, it is not enough to say that a patient is not positive. Those patients do need to go on to get a biopsy.’ ”
“Findings from a phase III clinical trial for advanced lung cancer patients could help oncologists better predict which patients are likely to receive the most benefit from immunotherapy as a first-line treatment based on the unique molecular characteristics of their tumor, according to a new study reported by a global team led by David Carbone, MD, PhD, of The Ohio State University Comprehensive Cancer – Arthur G. James Cancer Hospital and Richard J. Solove Research Institute (OSUCCC – James).
“In this study, researchers compared the effectiveness of the immunotherapy drug nivolumab (pronounced ‘nye VOL ue mab,’ marketed at Opdivo), with standard-of-care chemotherapy in 541 patients with previously untreated or recurrent non-small cell lung cancer (NSCLC) that expressed PDL-1 antibodies.”
“Updates to the National Comprehensive Cancer Network (NCCN) guidelines for the management of advanced non–small cell lung cancer (NSCLC) stress the importance of multiplexed biomarker testing at diagnosis to aid in the selection of appropriate first-line and subsequent lines of therapy, said presenters at the 2017 NCCN Annual Conference.
“The latest version of the guidelines recommends that PD-L1, in addition to molecular analysis, be employed as a biomarker to direct initial therapy, with ≥50% expression established as the threshold for a positive result. The PD-L1 test ‘decides whether a patient has enough of the marker to warrant initial immunotherapy,’ said presenter Gregory J. Riely, MD, PhD.”
“A recent survey of over 2,000 women newly diagnosed with breast cancer found that half of those who undergo bilateral mastectomy after genetic testing don’t actually have mutations known to confer increased risk of additional cancers, according to a study by researchers at the Stanford University School of Medicine and four other U.S. medical centers.
“Instead the women had what are known as variants of uncertain significance, or VUS, that are often eventually found to be harmless. A bilateral mastectomy is a surgical procedure in which both of a woman’s breasts are removed after a diagnosis of cancer in one breast.”
“In 2017, a lung cancer diagnosis must be accompanied by biomarker testing, whether it be for a genomic alteration, such as EGFR, ALK, or ROS1, or the immune marker PD-L1, according to Daniel B. Costa, MD, PhD, MMSc.
“Moreover, even with FDA-approved agents designed to target these abnormalities or expression levels, researchers are still hoping to uncover additional markers and match novel therapies to them.”
“Genomic Health, Inc. (Nasdaq: GHDX) today announced the presentation of new results from a large multi-center validation study, which confirmed that the Oncotype DX® Genomic Prostate Score™ (GPS) is a strong independent predictor of metastases at 10 years in prostate cancer patients across all National Comprehensive Cancer Network (NCCN) clinical risk groups. The clinical validation study data were designated one of the ‘best posters’ (abstract #352) at the 32nd Annual European Association of Urology (EAU) Congress in London.”