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  • Author: Jairam Krishnamurthy x
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Jing Xi, Aabha Oza, Shana Thomas, Foluso Ademuyiwa, Katherine Weilbaecher, Rama Suresh, Ron Bose, Mathew Cherian, Leonel Hernandez-Aya, Ashley Frith, Lindsay Peterson, Jingqin Luo, Jairam Krishnamurthy, and Cynthia X. Ma

Background: Cyclin-dependent kinase (CDK) 4/6 inhibitors are now the standard of care for hormone receptor–positive (HR+), HER2-negative (HER–) metastatic breast cancer (MBC). However, guidelines are lacking regarding their optimal sequencing with other available agents. This study examines physician practice patterns and treatment outcomes of palbociclib and subsequent therapies in a real-world setting. Methods: A retrospective chart review was conducted for consecutive patients with MBC who received palbociclib between February 2015 and August 2017 at the Alvin J. Siteman Cancer Center. Kaplan-Meier method was used to generate time-to-event curves and estimate median progression-free survival (mPFS). Log-rank test was used to compare differences. Results: A total of 200 patients, with a median age of 59.4 years and a follow-up of 19.5 months, were included. Palbociclib was most frequently combined with letrozole (73.5%), followed by fulvestrant (25%), anastrozole (1%), and tamoxifen (0.5%). Most patients received palbociclib in the endocrine-resistant setting (n=42, n=50, and n=108 in the first-, second-, and subsequent-line settings, respectively), and the fraction of patients receiving palbociclib as first- or second-line therapy increased in recent months (P=.0428). mPFS was 20.7, 12.8, and 4.0 months with palbociclib administered in the first-, second-, and subsequent-line settings, respectively (P<.0001). Incidences of grade 3/4 neutropenia (41.5%) and dose reductions (29%) were comparable to reports in the literature. Among patients whose disease progressed on palbociclib (n=104), the most frequent next-line treatment was capecitabine (n=21), followed by eribulin (n=16), nab-paclitaxel (n=15), and exemestane + everolimus (n=12). mPFS with hormone therapy alone or in combination with targeted agents (n=32) after first-, second-, and subsequent-line palbociclib was 17.0, 9.3, and 4.2 months, respectively (P=.04). mPFS with chemotherapy (n=70) was not reached, 4.7, and 4.1 months after first-, second-, and subsequent-line palbociclib, respectively (P=.56). Conclusions: Palbociclib is effective for HR+/HER2– MBC in real-world practice. Hormone therapy alone or in combination with targeted agents remains an effective option after palbociclib progression.

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William J. Gradishar, Benjamin O. Anderson, Jame Abraham, Rebecca Aft, Doreen Agnese, Kimberly H. Allison, Sarah L. Blair, Harold J. Burstein, Chau Dang, Anthony D. Elias, Sharon H. Giordano, Matthew P. Goetz, Lori J. Goldstein, Steven J. Isakoff, Jairam Krishnamurthy, Janice Lyons, P. Kelly Marcom, Jennifer Matro, Ingrid A. Mayer, Meena S. Moran, Joanne Mortimer, Ruth M. O'Regan, Sameer A. Patel, Lori J. Pierce, Hope S. Rugo, Amy Sitapati, Karen Lisa Smith, Mary Lou Smith, Hatem Soliman, Erica M. Stringer-Reasor, Melinda L. Telli, John H. Ward, Jessica S. Young, Jennifer L. Burns, and Rashmi Kumar

Several new systemic therapy options have become available for patients with metastatic breast cancer, which have led to improvements in survival. In addition to patient and clinical factors, the treatment selection primarily depends on the tumor biology (hormone-receptor status and HER2-status). The NCCN Guidelines specific to the workup and treatment of patients with recurrent/stage IV breast cancer are discussed in this article.

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NCCN Guidelines® Insights: Breast Cancer, Version 4.2021

Featured Updates to the NCCN Guidelines

William J. Gradishar, Meena S. Moran, Jame Abraham, Rebecca Aft, Doreen Agnese, Kimberly H. Allison, Sarah L. Blair, Harold J. Burstein, Chau Dang, Anthony D. Elias, Sharon H. Giordano, Matthew P. Goetz, Lori J. Goldstein, Sara A. Hurvitz, Steven J. Isakoff, Rachel C. Jankowitz, Sara H. Javid, Jairam Krishnamurthy, Marilyn Leitch, Janice Lyons, Jennifer Matro, Ingrid A. Mayer, Joanne Mortimer, Ruth M. O'Regan, Sameer A. Patel, Lori J. Pierce, Hope S. Rugo, Amy Sitapati, Karen Lisa Smith, Mary Lou Smith, Hatem Soliman, Erica M. Stringer-Reasor, Melinda L. Telli, John H. Ward, Kari B. Wisinski, Jessica S. Young, Jennifer L. Burns, and Rashmi Kumar

The NCCN Guidelines for Breast Cancer include up-to-date guidelines for clinical management of patients with carcinoma in situ, invasive breast cancer, Paget disease, phyllodes tumor, inflammatory breast cancer, male breast cancer, and breast cancer during pregnancy. These guidelines are developed by a multidisciplinary panel of representatives from NCCN Member Institutions with breast cancer–focused expertise in the fields of medical oncology, surgical oncology, radiation oncology, pathology, reconstructive surgery, and patient advocacy. These NCCN Guidelines Insights focus on the most recent updates to recommendations for adjuvant systemic therapy in patients with nonmetastatic, early-stage, hormone receptor–positive, HER2-negative breast cancer.