Neoadjuvant buparlisib plus trastuzumab and paclitaxel for women with HER2+ primary breast cancer: A randomised, double-blind, placebo-controlled phase II trial (NeoPHOEBE).

Abstract

AIM:

The Neoadjuvant PI3K inhibition in HER2 OverExpressing Breast cancEr (NeoPHOEBE) trial evaluated the efficacy and safety of buparlisib, a pan-phosphatidylinositol 3-kinase (PI3K) inhibitor, plus trastuzumab and paclitaxel as neoadjuvant treatment for human epidermal growth factor receptor-2 positive (HER2+) breast cancer.

METHODS:

NeoPHOEBE was a neoadjuvant, phase II, randomised, double-blind study. Women with HER2+ breast cancer were randomised within two independent cohorts by PIK3CA mutation status and, in each cohort stratified by oestrogen receptor (ER) status to receive buparlisib or placebo plus trastuzumab (first 6 weeks) followed by buparlisib or placebo with trastuzumab and paclitaxel. Primary end-point was pathological complete response (pCR) rate; key secondary end-point was objective response rate (ORR) at 6 weeks. Exploratory end-points were evaluation of Ki67 levels and change in tumour infiltrating lymphocytes (TILs) in intermediate biopsies at day 15.

RESULTS:

Recruitment was suspended mainly due to liver toxicity after enrolment of 50 of the planned 256 patients. In each arm (buparlisib n = 25; placebo n = 25) 21 patients (84%) had wild type PIK3CA and 4 patients (16%) had mutant PIK3CA. Overall, pCR rate was similar between buparlisib and placebo arms (32.0% versus 40%; one-sided P = 0.811). A trend towards higher ORR (68.8% versus 33.3%; P = 0.053) and a significant decrease in Ki67 (75% versus 26.7%; P = 0.021) was observed in buparlisib versus placebo arm in the ER+ subgroup (Pinteraction = 0.03).

CONCLUSIONS:

Addition of the pan-PI3K inhibitor buparlisib to taxane-trastuzumab-based therapy in HER2+ early breast cancer was not feasible. However, the higher ORR and Ki67 reduction in the ER+, HER2+ subgroup indicates a potential role for PI3K-targeted therapy in this setting and may warrant further investigation with better-tolerated second-generation PI3K inhibitors.

TRIAL REGISTRATION IDENTIFIER:

NCT01816594.

• Authors: Sibylle Loibl, Lorena de la Pena, Valentina Nekljudova, Dimitrios Zardavas, Stefan Michiels, Carsten Denkert, Mahdi Rezai, Begoña Bermejo, Michael Untch, Soo Chin Lee, Sabine Turri, Patrick Urban, Sherko Kümmel, Guenther Steger, Andrea Gombos, Michael Lux, Martine J Piccart, Gunter Von Minckwitz, José Baselga, Sherene Loi
• Journal: European journal of cancer (Oxford, England : 1990) (Eur J Cancer) Vol. 85 Pg. 133-145 (11 2017) ISSN: 1879-0852 [Electronic] England
• PMID: 28923573 (Publication Type: Clinical Trial, Phase II, Journal Article, Multicenter Study, Randomized Controlled Trial, Research Support, Non-U.S. Gov't)
• Copyright: Copyright © 2017 Elsevier Ltd. All rights reserved.

Chemical References

• Aminopyridines
• Biomarkers, Tumor
• Ki-67 Antigen
• Morpholines
• NVP-BKM120
• Protein Kinase Inhibitors
• Class I Phosphatidylinositol 3-Kinases
• PIK3CA protein, human
• ERBB2 protein, human
• Receptor, ErbB-2
• Trastuzumab
• Paclitaxel

Topics

• Adult
• Aged
• Aminopyridines (administration & dosage, adverse effects)
• Antineoplastic Combined Chemotherapy Protocols (adverse effects, therapeutic use)
• Australia
• Biomarkers, Tumor (antagonists & inhibitors, genetics, metabolism)
• Biopsy
• Breast Neoplasms (drug therapy, enzymology, pathology)
• Chemical and Drug Induced Liver Injury (etiology)
• Chemotherapy, Adjuvant
• Class I Phosphatidylinositol 3-Kinases (antagonists & inhibitors, genetics, metabolism)
• Double-Blind Method
• Early Termination of Clinical Trials
• Europe
• Female
• Humans
• Ki-67 Antigen (metabolism)
• Lymphocytes, Tumor-Infiltrating (drug effects)
• Middle Aged
• Morpholines (administration & dosage, adverse effects)
• Mutation
• Neoadjuvant Therapy (adverse effects)
• Paclitaxel (administration & dosage, adverse effects)
• Protein Kinase Inhibitors (administration & dosage, adverse effects)
• Receptor, ErbB-2 (antagonists & inhibitors, metabolism)
• Time Factors
• Trastuzumab (administration & dosage, adverse effects)
• Treatment Outcome