Abstract 4401
Background
In Feb 2015, palbociclib plus letrozole (P+L) became the first cyclin-dependent-kinase 4/6 inhibitor approved for mBC/aBC in the US. Until now, long-term outcomes studies have included a limited number of patients receiving P+L. The objective of this study is to describe real-world patient characteristics and clinical effectiveness associated with P+L as initial endocrine-based therapy use 4 years post approval.
Methods
Adult postmenopausal women diagnosed with metastatic HR+/HER2- breast cancer who initiated P+L as first-line therapy on or after 2/3/2015 were identified by providers in the Cardinal Health Oncology Provider Extended Network, including 1800 oncologists/hematologists in the US. A subset of providers abstracted data related to patient characteristics and clinical outcomes including disease response and disease progression into an electronic case report from (eCRF). Data were abstracted from the time of initiation of P+L through Feb 2019 (or end of follow up/death). Providers were shown response classification schema corresponding to RECIST v1.1 and asked to indicate the patient’s best response if recorded. The objective response rates (ORR – incl. complete response [CR] and partial response [PR]), clinical benefit rates (CBR – incl. CR+PR+stable disease [SD] >24 wks), and progression-free survival (PFS) rate at 12-month were reported. Each eCRF was reviewed by independent clinical staff; source data was verified on 10% of the patients.
Results
31 providers submitted 202 eCRFs, of which, 193 were eligible. Median follow-up from 1L P+L initiation was 15.4 months, 45.6% of patients had discontinued P+L at data cut-off. Table shows key patient characteristics and ORR, CBR, and PFS rate at 12-month, each showing benefit of 1L P+L in the real-world.Table:
338P
N = 193 | All |
---|---|
Mean age at diagnosis, yrs | 62.7 |
Non-Hispanic white, % | 74.6 |
Black/African-American, % | 17.1 |
ECOG-PS 0/1, % | 89.6 |
N0, % | 22.8 |
Visceral mets, % | 51.3 |
Bone only mets, % | 25.4 |
ORR, % | 65.8 |
CR | 9.8 |
PR | 56.0 |
CBR†, % | 88.0 |
CR | 12.7 |
PR | 61.3 |
SD† | 14.0 |
12-month PFS, % | 74.5 |
†Excluding 43 patients with duration of treatment <24 wks
Conclusions
These real-world data demonstrate the benefit of 1L P+L 4 years post approval in the US and support the clinical benefit of 1L P+L reported in randomized clinical trials.
Clinical trial identification
Editorial acknowledgement
Legal entity responsible for the study
Pfizer Inc.
Funding
Pfizer Inc.
Disclosure
J. Kish: Full / Part-time employment: Cardinal Health; Advisory / Consultancy, Paid consultant in connection with the development of this abstract: Pfizer Inc. J. Trocio: Shareholder / Stockholder / Stock options, Full / Part-time employment: Pfizer Inc. T. Miller: Full / Part-time employment: Cardinal Health; Advisory / Consultancy, Paid consultant in connection with the development of this abstract: Pfizer Inc. D. Nero: Full / Part-time employment: Cardinal Health; Advisory / Consultancy, Paid consultant in connection with the development of this abstract: Pfizer Inc. D. Liassou: Full / Part-time employment: Cardinal Health; Advisory / Consultancy, Paid consultant in connection with the development of this abstract: Pfizer Inc. X. Liu: Shareholder / Stockholder / Stock options, Full / Part-time employment: Pfizer Inc. L. McRoy: Shareholder / Stockholder / Stock options, Full / Part-time employment: Pfizer Inc. B. Feinberg: Full / Part-time employment: Cardinal Health; Advisory / Consultancy, Paid consultant in connection with the development of this abstract: Pfizer Inc.
Resources from the same session
4616 - Alpelisib (ALP) + Endocrine Therapy (ET) by Last Prior Therapy in Patients (pts) With PIK3CA-Mutated Hormone-Receptor Positive (HR+) Human Epidermal Growth Factor Receptor-2-Negative (HER2–) Advanced Breast Cancer (ABC): Additional Study Cohort in BYLieve
Presenter: Eva Ciruelos
Session: Poster Display session 2
Resources:
Abstract
3592 - PRECYCLE: Impact of CANKADO-based eHealth-support on quality of life in metastatic breast cancer patients treated with palbociclib and endocrine therapy.
Presenter: Tom Degenhardt
Session: Poster Display session 2
Resources:
Abstract
4168 - Efficacy and safety of oral poly (ADP-ribose) polymerase inhibitor fluzoparib in patients with BRCA1/2 mutations and platinum sensitive recurrent ovarian cancer
Presenter: Ning Li
Session: Poster Display session 2
Resources:
Abstract
2785 - Effect of response to last platinum-based chemotherapy in patients (pts) with platinum-sensitive, recurrent ovarian carcinoma in the phase 3 study ARIEL3 of rucaparib maintenance treatment
Presenter: Jonathan Ledermann
Session: Poster Display session 2
Resources:
Abstract
3496 - Integrated safety analysis of the poly(ADP-ribose) polymerase (PARP) inhibitor rucaparib in patients (pts) with ovarian cancer in the treatment and maintenance settings
Presenter: Rebecca Kristeleit
Session: Poster Display session 2
Resources:
Abstract
2844 - Clinical factors associated with prolonged response and survival under olaparib as maintenance therapy in BRCA mutated ovarian cancers
Presenter: S.Intidhar Labidi-Galy
Session: Poster Display session 2
Resources:
Abstract
1955 - A Prospective Evaluation of Tolerability of Niraparib Dosing Based on Baseline Body Weight (BW) and Platelet (plt) Count: Blinded Pooled Interim Safety Data from the NORA Study
Presenter: Xiaohua Wu
Session: Poster Display session 2
Resources:
Abstract
2539 - Evaluation of Niraparib 200 mg/d as Maintenance Therapy in Recurrent Ovarian Cancer and Associated Thrombocytopenia in a Real-World US Setting
Presenter: Premal Thaker
Session: Poster Display session 2
Resources:
Abstract
1290 - Niraparib initial dose and its’ management in patients with recurrent high-grade serous ovarian cancer.
Presenter: Jacek Grabowski
Session: Poster Display session 2
Resources:
Abstract
3353 - Results of the 3rd interim analysis of C-Patrol: A non-interventional study on olaparib in German routine clinical practice
Presenter: Jalid Sehouli
Session: Poster Display session 2
Resources:
Abstract