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Association details:
| Biomarker: | RB1 deletion |
|---|---|
| Cancer: | Hormone Receptor Positive Breast Cancer |
| Drug: | Ibrance (palbociclib) (CDK4 inhibitor, CDK6 inhibitor) |
| Direction: | Resistant |
Evidence:
Source:
Title:
Exploratory biomarker analysis of Young-PEARL [palbociclib plus exemestane with GnRH agonist versus capecitabine in premenopausal women with HR (hormone receptor)-positive, HER2-negative metastatic breast cancer (MBC)] study
Published date:
11/17/2020
Excerpt:
This was a phase II trial that randomized 184 patients with HR+ MBC in premenopausal women to palbociclib plus exemestane with GNRH agonist (Arm A, n=79) versus capecitabine (Arm B, n=62)....RB1 loss, known as a resistant biomarker of CDK4/6 inhibitor was found in 4% of Arm A, and was associated with shorter PFS (log2 HR=2.26, 95% CI 0.51 to 4.01, p=0.011)....The alteration of a few genes including Rb1 loss may be associated with resistance of palbociclib in HR-positive premenopausal population with MBC.
Secondary therapy:
GnRH agonist + exemestane
Trial ID:
