CDK4/6 Inhibitor Shows Promise as Single Agent in HR+ Breast Cancer

Excerpt:

“As a single agent, abemaciclib has shown exciting potential in heavily pretreated patients with refractory, hormone-receptor (HR)–positive, HER2-negative advanced breast cancer, following phase II findings of the MONARCH 1 trial.

“Results of the single-arm study, which were presented during the 2016 ASCO Annual Meeting1, show that the CDK4/6 inhibitor induced a response rate of nearly 20% in this patient population. The median progression-free survival (PFS) was 6 months (95% CI 4.2-7.5) and the median overall survival (OS) was 17.7 months (95% CI, 16 to not reached). Previously, abemaciclib received a breakthrough therapy designation in this setting from the FDA in October 2015.”

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Puma Biotechnology Submits Marketing Authorization Application for PB272 (Neratinib) as Extended Adjuvant Treatment of HER2-Positive Early Stage Breast Cancer in Europe

Excerpt:

“Puma Biotechnology, Inc. (NYSE: PBYI), a biopharmaceutical company, announced that it has submitted its Marketing Authorization Application (MAA) to the European Medicines Agency (EMA) for neratinib. The potential indication is for the extended adjuvant treatment of HER2-positive early stage breast cancer that has previously been treated with trastuzumab (Herceptin®)-based adjuvant therapy. The submission is based upon the ExteNET Phase III study, which reached its primary endpoint whereby neratinib demonstrated a statistically significant reduction of risk of invasive disease recurrence or death versus placebo.”

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Neoadjuvant HER2+ Breast Cancer Options Need Refinement, Expert Says

Excerpt:

“While recent findings from the I-SPY 2 trial have shown potential with the combination of ado-trastuzumab emtansine (T-DM1; Kadcyla) and pertuzumab (Perjeta) for patients with HER2-positive breast cancer, the neoadjuvant space still has a lot of work ahead, according to Lisa A. Carey, MD.

“Results presented at the 2016 AACR Annual Meeting1 showed that, out of the 249 patients enrolled on the I-SPY 2 study, 54% of those who received T-DM1/pertuzumab experienced a pathological complete response (pCR) rate compared with 22% of those who received the combination of paclitaxel (Abraxane) plus trastuzumab (Herceptin).

“This suggests that T-DM1 could increase overall survival (OS) in this patient population, but Carey adds more research with the regimen needs to be conducted.”

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Comparing Combination Treatments in HER2-Positive Early Breast Cancer

Excerpt:

“In patients with HER2-positive early breast cancer, data from a phase III trial has shown a significantly higher pathological complete response (pCR) rate with neoadjuvant docetaxel plus carboplatin plus trastuzumab plus pertuzumab (TCH+P) versus trastuzumab emtansine plus pertuzumab (T-DM1+P).

“According to the results of the KRISTINE trial, the TCH+P regimen was also associated with a higher rate of breast conserving surgery. However, researchers reported that T-DM1+P had a notably better safety profile and that health-related quality of life and physical functioning were maintained longer.

“ ‘Neoadjuvant TCH+P achieved a superior pCR rate compared with T-DM1+P and was associated with a higher breast-conserving-surgery rate,’ said Sara A. Hurvitz, MD, General Internal Medicine, Hematology & Oncology, UCLA Medical Center in Santa Monica, CA. ‘However, neoadjuvant T-DM1+P had a more favorable safety profile, with lower incidence of grade 3 or greater adverse events, serious adverse events, and adverse events leading to treatment discontinuation.’ ”

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Lilly Announces Results from MONARCH 1 Trial of Abemaciclib Monotherapy

Excerpt:

“Eli Lilly and Company (LLY) today announced results from the MONARCH 1 Phase 2 study of abemaciclib, a cyclin-dependent kinase (CDK) 4 and CDK 6 inhibitor, in patients with hormone-receptor-positive (HR+), human epidermal growth factor receptor 2-negative (HER2-) metastatic breast cancer. The data, which were presented at the 2016 American Society of Clinical Oncology (ASCO) Annual Meeting by Maura Dickler, M.D., of Memorial Sloan Kettering Cancer Center, showed that single-agent activity was observed in metastatic breast cancer patients, for whom endocrine therapy was no longer a suitable treatment option. The MONARCH 1 results (abstract #510) confirmed objective response (ORR), durability of response (DoR), clinical benefit rate (CBR) and progression-free survival (PFS).

“The single-arm study, designed to evaluate the safety and efficacy of abemaciclib monotherapy, enrolled 132 patients who were given 200 mg of abemaciclib orally every 12 hours until disease progression. Patients enrolled in the study were heavily pretreated, having experienced progressive disease on or after prior endocrine therapy, and had received prior chemotherapy with one or two chemotherapy regimens for metastatic disease. The primary objective of the trial was investigator-assessed ORR, with secondary endpoints of DoR, CBR and PFS.”

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Merrimack Presents Expanded Analysis from Seribantumab (MM-121) Phase 2 Breast Cancer Study at the AACR Precision Medicine Series

Excerpt:

“Merrimack Pharmaceuticals, Inc. (NASDAQ: MACK) today presented an expanded analysis of its Phase 2 study of seribantumab (MM-121) in combination with exemestane in HER2-negative, hormone receptor positive metastatic breast cancer.  Top line results from this study were announced in 2014. The final analysis, as well as a poster on Merrimack’s investigational companion diagnostic for seribantumab, were presented this week at the AACR Precision Medicine Series: Targeting the Vulnerabilities of Cancer, in Miami, Florida.

” ‘This data package underscores the most significant finding from all of our seribantumab Phase 2 studies – the identification of a heregulin-positive cancer cell phenotype that infiltrates approximately 30-50% of tumors and that may directly impact response to current standard-of-care therapies.  This hypothesis is supported by a strong consistent data set that spans three solid tumor types where we saw improved progression free survival when seribantumab was added to each of the standard-of-care regimens,’ saidAkos Czibere, MD, Ph.D., Senior Medical Director and Team Lead for the seribantumab program. ‘We are currently pursuing a registration study for seribantumab in patients with non-small cell lung cancer whose disease has progressed following immunotherapy.’ ”

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Neoadjuvant T-DM1/Pertuzumab Combo Boosts pCR in HER2+ Breast Cancer

Excerpt:

“Neoadjuvant ado-trastuzumab emtansine (T-DM1; Kadcyla) in combination with pertuzumab (Perjeta) improved pathologic complete response (pCR) compared with standard of care in patients with advanced HER2-positive breast cancer, according to recently reported data from the adaptively randomized I-SPY 2 trial.

“Of the 249 patients with HER2-positive disease included in the I-SPY 2 trial, 54% of those who received T-DM1/pertuzumab experienced a pCR compared with 22% of those who received the combination of paclitaxel (Abraxane) plus trastuzumab (Herceptin).

“These findings suggest that T-DM1 may ultimately increase survival in these patients, says lead study author Angela M. DeMichele, MD, professor of Medicine and Epidemiology at the University of Pennsylvania.”

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​​A Presurgery Combination Therapy May Improve Outcomes for Women With HER2-positive Breast Cancer

Excerpt:

“Results from the I-SPY 2 TRIAL show that a neoadjuvant (presurgery) therapy combination of the antibody-drug conjugate trastuzumab emtansine (T-DM1; Kadcyla) and pertuzumab (Perjeta) was more beneficial than paclitaxel plus trastuzumab for women with HER2-positive invasive breast cancer, according to research presented here at the AACR Annual Meeting 2016, April 16-20.

“In this portion of the I-SPY2 TRIAL, the investigators tested if T-DM1 plus pertuzumab could bring a substantially greater proportion of patients to the primary endpoint of pathological complete response [pCR] compared with paclitaxel plus trastuzumab. They also examined whether this combination could meet that goal without the need for patients to receive paclitaxel. pCR is an outcome in which, following neoadjuvant therapy, no residual invasive cancer is detected in the breast tissue and lymph nodes removed during surgery.”

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TDM-1 With Docetaxel/Pertuzumab Offers Benefit in Advanced HER2-Positive Breast Cancer

Excerpt:

“Combining trastuzumab emtansine with docetaxel both with and without pertuzumab yielded promising efficacy in a phase Ib/IIa study of patients with HER2-positive locally advanced (LABC) or metastatic breast cancer (MBC). Many patients, however, required dose reductions due to toxicity.

“Trastuzumab emtansine (T-DM1) is a drug-antibody conjugate, and has been shown to offer significant survival benefits in phase III trials of HER2-positive metastatic breast cancer. ‘In preclinical studies, T-DM1 exhibited enhanced antitumor activity when combined with docetaxel or pertuzumab,’ wrote study authors led by Miguel Martin, MD, PhD, of Hospital General Universitario Gregorio Marañón in Madrid.”

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