Video: Lisa A. Carey, MD, and Julie Gralow, MD: Top Breast Cancer Papers Presented at the 2016 ASCO Annual Meeting

Excerpt:

“Lisa A. Carey, MD, of the University of North Carolina, and Julie Gralow, MD, of the University of Washington, discuss the most important data presented this year on treating breast malignancies (Abstracts LBA1, 500, and 507).”

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Everolimus Survival Benefit Suggested in Updated NET Trial Results

Excerpt:

“Patients with nonfunctioning neuroendocrine tumors (NETs) of lung or gastrointestinal (GI) origin continued to live longer when treated with the mammalian target of rapamycin (mTOR) inhibitor everolimus (Afinitor) than with placebo, ongoing follow-up in a randomized trial has shown.

“A second planned interim analysis of the RADIANT-4 trial showed a 27% reduction in the estimated risk of death for patients who received everolimus compared with placebo. However, the difference did not meet the statistical threshold for overall survival (OS) significance.

“As previously reported, the trial met the primary endpoint of progression-free survival (PFS), and a first interim survival analysis showed a trend in favor of the everolimus arm. Follow-up for survival will continue, James C. Yao, MD, a professor at The University of Texas MD Anderson Cancer Center, reported at the 2016 ASCO Annual Meeting.”

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Binimetinib Improves PFS in NRAS-Mutated Metastatic Melanoma

Excerpt:

“The novel MEK inhibitor binimetinib resulted in improved progression-free survival (PFS) and response rates vs dacarbazine in patients with NRAS-mutated advanced unresectable/metastatic melanoma, according to results of an open-label phase III trial.

“ ‘NRAS mutations are present in approximately 20% of all patients with metastatic melanoma,’ said Reinhard Dummer, MD, of the University Hospital Zurich in Switzerland. ‘It activates the MAPK pathway and by this drives cell proliferation and anti-apoptotic mechanisms.’ Preclinical studies have shown that NRAS-mutant melanoma is sensitive to MEK inhibition, and binimetinib inhibits both MEK1 and MEK2. A phase II study showed clinical activity in NRAS-mutant metastatic melanoma.

“The NEMO trial included 402 patients randomized 2:1 to receive either binimetinib (269 patients) or dacarbazine (133 patients; 19 were not treated and were not evaluated for safety). Patients were either treatment-naive or had progressed on or after immunotherapy. The primary endpoint of the study was PFS. The results were presented at the 2016 American Society of Clinical Oncology (ASCO) Annual Meeting held earlier this month in Chicago (abstract 9500).”

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Can Patients Discontinue Immunotherapy and Still Benefit?

Excerpt:

“At present in clinical practice, immunotherapy with anti-PD-1 agents is administered indefinitely until intolerable toxicities or progressive disease sets in. But there has been anecdotal evidence that patients who stop treatment may still derive benefit, and now there is evidence of this from a post hoc analysis of a randomized study.

“It comes from the CheckMate 069 trial that evaluated the combination of nivolumab (Opdivo, Bristol-Myers Squibb Company) and ipilimumab (Yervoy, Bristol-Myers Squibb Company) vs ipilimumab alone in patients with metastatic melanoma.

“New results from a post hoc analysis of this trial, presented at the recent American Society of Clinical Oncology (ASCO) 2016 Annual Meeting (abstract 9518), show that a subgroup of patients who discontinued combination immunotherapy because of treatment-related adverse events achieved an impressive overall response rate (ORR) of 66%.”

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Treating 'Out-of-the-Box' Melanoma Patients With Anti-PD-1s

Excerpt:

“Clinical trials that led to the approval of new therapies often have strict exclusion criterion, and so yield no data on how the drugs fare in patients with preexisting conditions. For that, data from the real-world setting are needed, and the latest to come in for the anti-PD-1 immunotherapies are data to show that they are safe and effective even in patients with preexisting autoimmune diseases.

“Researchers reporting a retrospective study at the American Society of Clinical Oncology (ASCO) 2016 Annual Meeting say that the new data are reassuring and that preexisting autoimmune diseases should not preclude treatment with immunotherapy with the PD-1 inhibitors pembrolizumab (Keytruda, Merck & CO) and nivolumab (Opdivo, Bristol-Myers Squibb).”

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Osimertinib Demonstrates Early Efficacy for Leptomeningeal Disease in NSCLC

Excerpt:

“Phase I findings of a study examining the efficacy of osimertinib (Tagrisso) in heavily pretreated patients with EGFR-mutated advanced non–small cell lung cancer (NSCLC) and leptomeningeal disease showed promising activity in the patient population.

“In the BLOOM study, which was presented during the 2016 ASCO Annual Meeting, treatment with the third-generation EGFR TKI osimertinib was associated with radiologic improvement of leptomeningeal disease in 33% and neurologic improvement in patients who presented with neurologic impairment at baseline. In addition, 2 of the 21 patients (9.5%) enrolled experienced clearing of cerebrospinal fluid (CSF) cytology, said James Chih-Hsin Yang, MD, PhD, who announced the results.”

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Can Liquid Biopsies and Tumor Biomarkers Personalize Prostate Cancer Treatment?

Excerpt:

“Experimental, minimally invasive ‘liquid biopsy’ blood tests might soon help to personalize prostate cancer treatment by predicting androgen resistance and survival benefits from particular treatments, researchers announced at the 2016 American Society of Clinical Oncology (ASCO) Annual Meeting, held June 3–7 in Chicago.

“Liquid biopsies detect circulating tumor cells (CTCs) or bits of tumor DNA (ctDNA). Not all tumors shed cells or DNA into a patient’s bloodstreams, but most do. And when they do, they can reveal a lot about themselves—including molecular signatures that can be targeted with specific treatments.

“Recent years have seen an explosion of candidate biomarkers for prostate cancer and other malignancies, including both liquid biopsies and tumor-sample gene panels. Most candidate biomarkers have been prognostic gene-mutation signatures that can estimate patient survival regardless of what treatment strategies are attempted. These prognostic tests can be useful for risk-stratifying patients who are participating in clinical studies, or in communicating prognosis to a patient and his loved ones.”

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Brigatinib Shows Promise in ALK-Positive NSCLC After Crizotinib Therapy

Excerpt:

“The investigational tyrosine kinase inhibitor (TKI) brigatinib offered good response rates in a pivotal phase II trial of patients with ALK-positive non–small-cell lung cancer (NSCLC) whose disease progressed on crizotinib. The results were presented at the 2016 American Society of Clinical Oncology (ASCO) Annual Meeting, held June 3–7 in Chicago (abstract 9007).

“ ‘Most ALK-positive NSCLC patients treated with crizotinib eventually progress, often due to acquired ALK resistance mutations and/or poor CNS drug penetration,’ said Dong-Wan Kim, MD, PhD, of Seoul National University Hospital in South Korea, who presented the study.

“Brigatinib, a next-generation ALK TKI designed to have broad activity against resistant ALK mutants, showed promising clinical activity in a phase I/II study of crizotinib-treated ALK-positive NSCLC patients. The new open-label phase II ALTA study included 222 patients with locally advanced or metastatic NSCLC who had progressive disease on crizotinib. Patients were randomized to two brigatinib treatment regimens: group A (112 patients) received oral brigatinib 90 mg once per day, and group B (110 patients) received the same dose for 7 days followed by 180 mg once per day.”

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Palbociclib Addition to Letrozole Improved PFS in ER+/HER2- Breast Cancer

Excerpt:

“Palbociclib (Ibrance), when added to letrozole, increased the median progression-free survival (PFS) rate in patients with ER-positive, HER2-negative advanced or metastatic breast cancer by >10 months, according to results from the phase III PALOMA-2 trial presented at the 2016 ASCO Annual Meeting. 

“The risk of disease progressed was reduced by 42 with the addition of palbociclib, a CDK4/6 inhibitor, when compared with letrozole alone. The combination of palbociclib and letrozole was granted an accelerated approval in February 2015, based on the phase II PALOMA-1 study. These results from PALOMA-2 provide confirmation of the combination’s benefits in the frontline setting.

“ ‘These data represent the longest frontline improvement in median PFS seen to date in women with advanced ER+ breast cancer,’ senior study author Dennis J. Slamon, MD, PhD, chief of the Division of Hematology/Oncology in the UCLA Department of Medicine, said when presenting the findings at ASCO.”

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