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J Thorac Oncol. 2019 Jul 11. pii: S1556-0864(19)30557-X. doi: 10.1016/j.jtho.2019.06.027. [Epub ahead of print]

SWOG S1400C (NCT02154490)-A Phase II Study of Palbociclib for Previously Treated Cell Cycle Gene Alteration-Positive Patients with Stage IV Squamous Cell Lung Cancer (Lung-MAP Substudy).

Author information

Fox Chase Cancer Center, Philadelphia, Pennsylvania. Electronic address:
SWOG Statistics and Data Management Center at Fred Hutchinson Cancer Reseach Center, Seattle, Washington.
Loyola University Chicago Stritch School of Medicine, Maywood, Illinois.
Kaiser Permanente National Community Oncology Research Program/Kaiser Permanente Medical Group, Los Angeles, California.
Mercy Medical Center Tri-County Hematology/Oncology Association, Canton, Ohio.
University of Pittsburgh Cancer Institute, Pittsburgh, Pennsylvania.
Washington University School of Medicine, St. Louis, Missouri.
Thoracic/Head and Neck Medical Oncology, University of Texas M. D. Anderson Cancer Center, Houston, Texas.
University of California Davis Cancer Center, Sacramento, California.
Medical Oncology, Yale Cancer Center, New Haven, Connecticut.



Lung-MAP (SWOG S1400) is a master platform trial assessing targeted therapies in squamous NSCLC. The objective of study C (S1400C) was to evaluate the response rate to palbociclib, a cyclin-dependent kinase 4 and cyclin-dependent kinase 6 inhibitor, in patients with cell cycle gene abnormalities.


Patients with squamous NSCLC, a performance status of 0 to 2, and normal organ function who had progressed after at least one prior platinum-based chemotherapy with cyclin-dependent kinase 4 gene (CDK4) or cyclin D1 gene (CCND1), cyclin D2 gene (CCND2), or cyclin D3 gene (CCND3) amplifications on tumor specimens were eligible. The study was originally designed as a phase II/III trial comparing palbociclib with docetaxel, but it was modified to a single-arm phase II trial with the primary end point of response when immunotherapy was approved. If two or fewer responses were seen in the first 20 patients, then the study would cease enrollment.


A total of 88 patients (9% of patients screened) were assigned to S1400C, and 53 patients enrolled (including 17 to receive docetaxel). One patient who had been registered to receive docetaxel was re-registered to receive palbociclib after progression while taking docetaxel. The frequencies of cell cycle gene alterations in the eligible patients taking palbociclib (n = 32) were as follows: CCND1, 81% (n = 26); CCND2, 9% (n = 3); CCND3, 6% (n = 2); and CDK4, 3% (n = 1). In all, 32 eligible patients received palbociclib. There were two partial responses (response rate 6% [95% confidence interval (CI): 0%-15%]), both with CCND1 amplification. Twelve patients had stable disease (38% [95% CI: 21%-54%]). The median progression-free survival was 1.7 months (95% CI: 1.6-2.9 months) and the median overall survival was 7.1 months (95% CI: 4.2-12.5).


Palbociclib as monotherapy failed to demonstrate the prespecified criteria for advancement to phase III testing.


Cell cycle gene alteration; Cyclin-dependent kinase; Lung cancer; Master protocol; Squamous NSCLC; Targeted therapy


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