Abstract
Introduction: Patients with hormone receptor-positive/HER2-negative (HR+/HER2-) metastatic breast cancer have benefitted from treatment with palbociclib, a cyclin-dependent kinase (CDK) 4/6 inhibitor capable of selectively targeting mechanisms of cell cycle progression that contribute to tumor cell proliferation. Palbociclib use in this setting demonstrates improved progression-free survival when given in combination with aromatase inhibitors or fulvestrant. Areas covered: The authors describe the current state of research surrounding palbociclib use in breast cancer, present evidence supporting a role for palbociclib in additional subtypes of metastatic breast cancer such as HER2-positive (HER2+) and triple-negative, report ongoing clinical trials aimed at expanding the scope of use for palbociclib, and discuss expected clinical results that will better inform decisions on including palbociclib as a part of breast cancer treatment strategies. Expert opinion: Preclinical and clinical studies have shown promising evidence for palbociclib use in metastatic HER2+ and androgen receptor-expressing triple-negative breast cancer but mixed results in the adjuvant/neoadjuvant setting, where differences may only be detectable in high-risk disease. Palbociclib combinations may constitute viable replacements for chemotherapy in the neoadjuvant setting as part of de-escalation strategies. Investigation into synergy of palbociclib with immunotherapies is also ongoing based on non-canonical effects of CDK4/6 inhibition on the tumor immune microenvironment.
Original language | English (US) |
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Pages (from-to) | 281-290 |
Number of pages | 10 |
Journal | Expert opinion on pharmacotherapy |
Volume | 22 |
Issue number | 3 |
DOIs | |
State | Published - 2021 |
Externally published | Yes |
Keywords
- Adjuvant therapy
- CDK4/6 inhibitors
- HER2-positive breast cancer
- HR+HER2- breast cancer
- breast cancer
- clinical trials
- metastatic breast cancer
- neoadjuvant therapy
- palbociclib
- triple-negative breast cancer
ASJC Scopus subject areas
- Pharmacology
- Pharmacology (medical)