A Study of Palbociclib in Addition to Standard Endocrine Treatment in Hormone Receptor Positive Her2 Normal Patients With Residual Disease After Neoadjuvant Chemotherapy and Surgery

Official Title

Phase III Study Evaluating Palbociclib (PD-0332991), a Cyclin-Dependent Kinase (CDK) 4/6 Inhibitor in Patients With Hormone-receptor-positive, HER2-normal Primary Breast Cancer With High Relapse Risk After Neoadjuvant Chemotherapy "PENELOPEB"


The PENELOPEB study is designed to demonstrate that in the background of standard anti-hormonal therapy palbociclib provides superior invasive disease-free survival (iDFS) compared to placebo in pre- and postmenopausal women with HR-positive/HER2-normal early breast cancer at high risk of relapse after showing less than pathological complete response to neoadjuvant taxane- containing chemotherapy. Considering the high risk of recurrence in patients after neoadjuvant chemotherapy and a high CPS-EG score, palbociclib appears to be an attractive option with a favourable safety profile for these patients.

Trial Description

Primary Outcome:

  • Invasive disease free survival (iDFS) for palbociclib vs. placebo in patients with high CPS-EG score after neoadjuvant chemotherapy receiving standard adjuvant endocrine therapy for HR-positive/HER2-normal primary breast cancer.
Secondary Outcome:
  • iDFS excluding second non-breast cancers
  • distant disease free survival (DDFS)
  • overall survival (OS)
  • iDFS per treatment group in patients with luminal-B tumours (as determined by e.g. PAM50 or any other commercially available test at the time of analysis)
  • compliance and safety according to NCI-CTCAE Version 4.0
  • patients reported outcomes EORTC QLQ C30, • EORTC QLQ BR-23, • EORTC QLQ FA-13 Fatigue, • GAD7 patient self-rating mood scale
  • quality-adjusted life years (QALY), health economic outcomes EQ-5D
  • Area under the Curve (AUC), Cmax
  • correlations between exposure and efficacy and/or safety findings
About one third of patients with hormone-receptor (HR)-positive, HER2- normal breast cancer and residual disease after neoadjuvant chemotherapy have a substantial risk of relapse. The clinical-pathologic stage
  • estrogen/grade (CPS-EG)1 combining clinical stage before neoadjuvant treatment, pathological stage after neoadjuvant treatment, grading and estrogen-receptor status can be used to identify these high-risk patients. The CPS-EG score was additionally validated in 2454 patients with HRpositive/ HER2-normal tumours from the German neoadjuvant studies' metadatabase. Patients who had a score of 3 or higher or Score 2 and ypN+ disease show a 3-years iDFS of 77% despite adequate local therapy and adjuvant endocrine treatment. Cyclin dependent kinases (CDK), a group of serine/threonine kinases, play a key role in regulating cell cycle progression by interacting with specific cyclin proteins in luminal-type tumours.2,3 PD-0332991 (palbociclib) is an oral, highly selective inhibitor of CDK4/6 kinase activity that prevents cellular DNA synthesis by prohibiting progression of the cell cycle from G1 to S phase through blocking retinoblastoma (Rb) phosphorylation.4 Preclinical studies identified luminal ER subtype, elevated expression of cyclin D1 and Rb protein, and reduced p16 expression as being associated with sensitivity to palbociclib.

View this trial on ClinicalTrials.gov

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