Eribulin Plus Trastuzumab Safe, Effective in HER-2–Positive Metastatic Breast Cancer

The gist: Researchers recently tested a breast cancer treatment in a clinical trial—a research study with volunteer patients. The treatment combines the drug trastuzumab (aka Herceptin) with a new drug called eribulin mesylate. The goal of the trial was to find out how well the combination might work for patients who had already been treated with trastuzumab. All patients who participated had HER-positive metastatic breast cancer. It was found that the treatment was safe and effective, regardless of whether patients had already taken trastuzumab.

“Eribulin mesylate plus trastuzumab demonstrated activity in patients with HER-2–positive metastatic breast cancer regardless of prior treatment with trastuzumab, according to phase 2 study results presented at the Breast Cancer Symposium.

“Joyce O’Shaughnessy, MD, of the Texas Oncology Baylor Charles A. Sammons Cancer Center, and colleagues sought to evaluate whether prior trastuzumab (Herceptin, Genentech) affected the efficacy of eribulin mesylate (Halaven, Eisai) plus trastuzumab. Previous data indicated the combination conferred a 71% objective response rate as a first-line treatment.

“The analysis included 52 patients (median age, 59.5 years) who had not undergone prior chemotherapy for metastatic breast cancer. Twenty-one patients had previously received trastuzumab and 31 had not. A median of 23 months had passed since previous treatment.

“Patients received 1.4 mg/m2 IV eribulin mesylate on days 1 and 8 of a 21-day cycle. They also received an initial trastuzumab dose of 8 mg/kg, followed by 6-mg/kg doses on day 1 of each cycle. Median treatment duration was approximately 30 weeks.

“Researchers reported similar rates of objective clinical response (62% vs. 77%) and clinical benefit (81% vs. 87%) between patients who had received prior trastuzumab and those who had not.”