Outlook in HER2+ Breast Cancer Much Brighter Today Than 10 Years Ago, Expert Says

Excerpt:

“Over the last decade, the treatment landscape in HER2-positive breast cancer has changed dramatically, says Sara Hurvitz, MD.

” ‘I believe that a patient diagnosed today has a much greater chance of being alive 5 or 10 years from now—some of them may even be cured—and that compares very favorably with the outlook of 10 years ago when we just had 1 or 2 therapies and no evidence to support using HER2-targeted therapies after a patient’s disease grew,’ Hurvitz said.

“In an interview with Targeted Oncology, Hurvitz director of the Hematology/Oncology Breast Cancer Program and an associate professor in the Department of Medicine at the University of California, Los Angeles, discusses ongoing advances that continue to revolutionize the treatment of patients with HER2+ breast cancer.”

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Chemotherapy May Not Be Necessary for Intermediate-Risk, Early-Stage Breast Cancer

Excerpt:

“Women with early-stage breast cancer and an intermediate risk recurrence score from a 21-gene expression assay may be able to avoid chemotherapy, according to a retrospective study published in Cancer.

” ‘Through years of research discoveries, it became clear that we were overtreating many women with breast cancer, especially those with early-stage breast cancer,’ Carlos H. Barcenas, MD, assistant professor of breast medical oncology at The University of Texas MD Anderson Cancer Center, said in a press release. ‘In addition to chemotherapy’s obvious side effects, there were also long-term complications for these women as survivors.’ ”

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Can Less Costly 9-Week Trastuzumab Match Efficacy of 12-Month Regimen?

Excerpt:

“A cost-effectiveness analysis found that 9 weeks of trastuzumab therapy is better than the more standard 12 months in patients with HER2-positive breast cancer, without loss of clinical efficacy. The analysis is limited, though, by the need to combine various trials rather than any head-to-head comparisons.

“Trastuzumab has been shown to significantly improve survival in women with HER2-positive disease. ‘The budget impact of trastuzumab is high, mostly due to the drug’s high cost, and the most serious adverse effect observed is cardiac dysfunction,’ wrote study authors led by Caroline Clarke, PhD, of University College London in the United Kingdom. Though 12 months is considered the standard duration of therapy, some studies have also found similar results with only 9 or 10 weeks of trastuzumab.”

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Chemo Benefit Unclear in Breast Cancer Patients With Higher Recurrence Scores

Excerpt:

“In patients with hormone receptor–positive, HER2-negative, lymph node–negative breast cancer with a recurrence score (RS) based on a 21-gene expression assay of 11 to 25, outcomes were similar whether chemotherapy was used or not used, according to a retrospective analysis. However, the study’s limited follow-up means a benefit from chemotherapy in these patients cannot be ruled out.

“The Oncotype DX 21-gene expression assay is the most commonly used test of this kind in breast cancer in the United States. It offers an RS, and previous research has shown that patients with an RS below 11 fare very well when treated with endocrine therapy alone. ‘To our knowledge, it is unknown whether chemotherapy provides any additional benefit in outcomes in patients with hormone receptor–positive, HER2-negative, lymph node–negative, early-stage breast cancer with an RS of 11 to 25 who are treated with endocrine therapy,’ wrote study authors led by Carlos H. Barcenas, MD, MSc, of the University of Texas MD Anderson Cancer Center in Houston.”

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Novel HER2 Inhibitor Offers Manageable Toxicity, Anti-Tumor Activity in Metastatic Breast Cancer

Excerpt:

“A phase I trial found that the HER2 inhibitor ONT-380 had a lower incidence of certain adverse events associated with this class of agent and notable anti-tumor activity in heavily pretreated patients with HER2-positive metastatic breast cancer (MBC).

” ‘Though existing targeted therapies are improving outcomes in patients with HER2-positive MBC, disease resistance does eventually develop in most patients,’ wrote study authors led by Stacy Moulder, MD, of the MD Anderson Cancer Center in Houston. Also, some agents preclude combination with other regimens due to off-target effects such as skin rash and diarrhea.”

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Trial Explores Eliminating Breast Cancer Surgery in Exceptional Responders to Neoadjuvant Therapy

Excerpt:

“A prospective study is investigating whether breast cancer surgery can be eliminated in patients who respond well to neoadjuvant systemic therapy.

“The phase II single-center trial, conducted out of The University of Texas MD Anderson Cancer Center (NCT02945579), aims to determine how often breast cancer recurs in patients who previously received chemotherapy and follow-up radiation therapy, but not surgery, and have no evidence of disease. Forty patients with early-stage, triple-negative or HER2-positive breast cancer care underwent image-guided biopsy after completing chemotherapy and before beginning radiation therapy to see if surgery is necessary.”

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Humana Issues Positive Coverage Decision for NanoString’s Prosigna® Breast Cancer Assay

Excerpt:

“NanoString Technologies, Inc. (NASDAQ:NSTG), a provider of life science tools for translational research and molecular diagnostic products, today announced that Humana has issued a positive coverage decision for the Prosigna® Breast Cancer Gene Signature Assay. Humana and its more than 13 million members join other payors now covering Prosigna, collectively representing more than 175 million covered lives throughout the United States.

“This positive coverage decision is in line with updated ASCO guidelines released in February of 2016, wherein Prosigna is considered medically necessary to assess the necessity of adjuvant chemotherapy in ER-positive, HER2-negative, node-negative breast cancer patients, when adjuvant chemotherapy is not precluded due to any other factor.”

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Dual HER2-Blockade Plus AI Shows Promise in HER2+/ER+ Breast Cancer

Excerpt:

“Data from the phase II PERTAIN trial presented late last year at the 2016 San Antonio Breast Cancer Symposium (SABCS) showed that adding an aromatase inhibitor (AI) to pertuzumab (Perjeta) and trastuzumab (Herceptin) extended progression-free survival (PFS) by over 3 months versus trastuzumab plus an AI in patients with HER2-positive, HR-positive locally advanced or metastatic breast cancer.

“The median PFS was 18.89 months with the pertuzumab triplet compared with 15.80 months for trastuzumab and an AI alone (HR, 0.65; 95% CI, 0.48-0.89; P = .007). The objective response rates were 63.3% versus 55.7%, respectively.”

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Pegram Sheds Light on Margetuximab in HER2+ Breast Cancer

Excerpt:

“The Fc-modified monoclonal antibody margetuximab in combination with chemotherapy may offer a new treatment option for patients with HER2-positive metastatic breast cancer.

“In the ongoing phase III SOPHIA trial (NCT02492711), researchers are comparing margetuximab plus chemotherapy with trastuzumab (Herceptin) plus chemotherapy. In a previous phase I study, margetuximab demonstrated single-agent activity in HER2-positive tumors, leading researchers to explore the regimen in the phase III trial.”

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