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Breast Cancer Research and Treatment

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01-02-2018 | Review

Efficacy and safety in older patient subsets in studies of endocrine monotherapy versus combination therapy in patients with HR+/HER2− advanced breast cancer: a review

Authors: Rachel A. Freedman, Sara M. Tolaney

Published in: Breast Cancer Research and Treatment | Issue 3/2018

Abstract

Purpose

Prospective information regarding the tolerability and efficacy of endocrine therapy (ET) alone and in combination with targeted agents in older patients in the metastatic setting is limited. This review summarizes available trial data in this population.

Methods

We searched PubMed for Phase 2 or 3 trials with age-stratified patient cohorts (≥ 65 vs. < 65 years in most studies) with hormone receptor-positive (HR+), human epidermal growth factor receptor 2-negative (HER2−) advanced breast cancer treated with ET ± targeted agents.

Results

We identified 19 studies reporting 10 clinical trials. Efficacy was similar in age-stratified subsets. There was a reduced disease progression risk for ET + everolimus, palbociclib, or ribociclib versus ET alone. In the first-line setting, median progression-free survival (mPFS) in older patients was 8.5, 26.2 months, and not reached with letrozole + temsirolimus, palbociclib, and ribociclib, respectively, and in younger patients was 9.0, 18.8 months, and not reached, respectively. In the second-line setting, older patients had mPFS of 6.8 and 9.9 months with everolimus + exemestane and palbociclib + fulvestrant, respectively, and younger patients had mPFS of 8.1 and 9.5 months, respectively. Tolerability was worse for combination therapy versus monotherapy. No age-related differences in discontinuations were observed for CDK4/6 inhibitors, although a higher rate of treatment discontinuation was observed for patients ≥ 70 years receiving everolimus + exemestane. Adverse event rates were similar in age-stratified subsets.

Conclusions

ET + CDK4/6 or mTOR inhibitors are likely safe and effective in older patients with HR+, HER2− advanced breast cancer.

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Title: Efficacy and safety in older patient subsets in studies of endocrine monotherapy versus combination therapy in patients with HR+/HER2− advanced breast cancer: a review
Authors: Rachel A. Freedman
Sara M. Tolaney
Publication date: 01-02-2018
Publisher: Springer US
Published in: Breast Cancer Research and Treatment / Issue 3/2018
Print ISSN: 0167-6806
Electronic ISSN: 1573-7217
DOI: https://doi.org/10.1007/s10549-017-4560-6

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