PALbociclib CoLlaborative Adjuvant Study

Summary

This is a prospective, two arm, international, multicenter, randomized, open-label Phase III study evaluating the addition of 2 years of palbociclib to standard adjuvant endocrine therapy for patients with HR+ / HER2- early breast cancer (EBC). The purpose of the PALLAS study is to determine whether the addition of palbociclib to adjuvant endocrine therapy will improve outcomes over endocrine therapy alone for HR+/HER2- early breast cancer. Assessment of a variety of correlative analysis, including evaluation of the effect of palbociclib in genomically defined tumor subgroups, is planned.

Timeline

Start

2015-08

Primary completion

2020-11

Completion

2028-12

Outcome

Missed primary endpoint

registry analysis (other test); Palbociclib Plus Endocrine Therapy (Arm A) vs Endocrine Therapy Alone (Arm B); p = 0.65; Hazard Ratio (HR) 0.96 NCT02513394 ↗

paper At this final analysis of the PALLAS trial, the addition of adjuvant palbociclib to standard endocrine therapy did not improve outcomes over endocrine therapy alone PMID 34874182 ↗

release “PALLAS determined that the trial is unlikely to show a statistically significant improvement in the primary endpoint” pfizer.com ↗

Publications

• Shinn E, Zahrieh D, DeMichele A, Zdenkowski N, Lemieux J, Mao J, Bjelic-Radisic V, Naughton MJ, Pfeiler G, Gelmon K, Balko JM, Egle D, Zoppoli G, Traina T, Jimenez MM, Novoa SA, Haddad T, Chan A, Ring A, Wolff A, Symmans WF, Ponce Lorenzo J, Sabanathan D, Burstein HJ, Nowecki ZI, Pristauz-Telsnigg G, Brufsky A, Bellet-Ezquerra M, Foukakis T, Novik Y, Rubovszky G, Singer CF, Muehlbacher K, Filho OM, Goulioti T, Law E, Partridge AH, Carey LA, Zoroufy A, Hlauschek D, Fesl C, Mayer EL, Gnant M. Impact of adding palbociclib on treatment adherence to ongoing adjuvant endocrine treatment in the global randomized PALLAS randomized trial in patients with early breast cancer. Breast Cancer Res Treat. 2025 Jun;211(2):385-397. doi: 10.1007/s10549-025-07653-2. Epub 2025 Mar 27.
• DeMichele A, Dueck AC, Hlauschek D, Martin M, Burstein H, Pfeiler G, Zdenkowski N, Wolff A, Bellet-Ezquerra M, Winer E, Balic M, Miller K, Colleoni M, Lake D, Rubovsky G, Cameron D, Balko J, Singer CF, Nowecki Z, Iwata H, Wolmark N, Parraga KA, Rugo H, Steger GG, Traina T, Werutsky G, Czajkowska D, Metzger O, El-Abed S, Theall KP, Lu RD, O'Brien P, Fesl C, Mayer E, Gnant M. Outcomes in stage IIA versus stage IIB/III in the PALLAS trial [ABCSG-42/AFT-05/PrE0109/BIG-14-13]). Breast Cancer Res. 2025 Jan 23;27(1):12. doi: 10.1186/s13058-024-01941-3.
• Pfeiler G, Hlauschek D, Mayer EL, Deutschmann C, Kacerovsky-Strobl S, Martin M, Meisel JL, Zdenkowski N, Loibl S, Balic M, Park H, Prat A, Isaacs C, Bajetta E, Balko JM, Bellet-Ezquerra M, Bliss J, Burstein H, Cardoso F, Fohler H, Foukakis T, Gelmon KA, Goetz M, Haddad TC, Iwata H, Jassem J, Lee SC, Linderholm B, Los M, Mamounas EP, Miller KD, Morris PG, Munzone E, Gal-Yam EN, Ring A, Shepherd L, Singer C, Thomssen C, Tseng LM, Valagussa P, Winer EP, Wolff AC, Zoppoli G, Machacek-Link J, Schurmans C, Huang X, Gauthier E, Fesl C, Dueck AC, DeMichele A, Gnant M; PALLAS Groups and Investigators. Impact of BMI in Patients With Early Hormone Receptor-Positive Breast Cancer Receiving Endocrine Therapy With or Without Palbociclib in the PALLAS Trial. J Clin Oncol. 2023 Nov 20;41(33):5118-5130. doi: 10.1200/JCO.23.00126. Epub 2023 Aug 9.
• Mayer EL, Fesl C, Hlauschek D, Garcia-Estevez L, Burstein HJ, Zdenkowski N, Wette V, Miller KD, Balic M, Mayer IA, Cameron D, Winer EP, Ponce Lorenzo JJ, Lake D, Pristauz-Telsnigg G, Haddad TC, Shepherd L, Iwata H, Goetz M, Cardoso F, Traina TA, Sabanathan D, Breitenstein U, Ackerl K, Metzger Filho O, Zehetner K, Solomon K, El-Abed S, Theall KP, Lu DR, Dueck A, Gnant M, DeMichele A. Treatment Exposure and Discontinuation in the PALbociclib CoLlaborative Adjuvant Study of Palbociclib With Adjuvant Endocrine Therapy for Hormone Receptor-Positive/Human Epidermal Growth Factor Receptor 2-Negative Early Breast Cancer (PALLAS/AFT-05/ABCSG-42/BIG-14-03). J Clin Oncol. 2022 Feb 10;40(5):449-458. doi: 10.1200/JCO.21.01918. Epub 2022 Jan 7.
• Gnant M, Dueck AC, Frantal S, Martin M, Burstein HJ, Greil R, Fox P, Wolff AC, Chan A, Winer EP, Pfeiler G, Miller KD, Colleoni M, Suga JM, Rubovsky G, Bliss JM, Mayer IA, Singer CF, Nowecki Z, Hahn O, Thomson J, Wolmark N, Amillano K, Rugo HS, Steger GG, Hernando Fernandez de Aranguiz B, Haddad TC, Perello A, Bellet M, Fohler H, Metzger Filho O, Jallitsch-Halper A, Solomon K, Schurmans C, Theall KP, Lu DR, Tenner K, Fesl C, DeMichele A, Mayer EL; PALLAS groups and investigators. Adjuvant Palbociclib for Early Breast Cancer: The PALLAS Trial Results (ABCSG-42/AFT-05/BIG-14-03). J Clin Oncol. 2022 Jan 20;40(3):282-293. doi: 10.1200/JCO.21.02554. Epub 2021 Dec 7.
• Mayer EL, Dueck AC, Martin M, Rubovszky G, Burstein HJ, Bellet-Ezquerra M, Miller KD, Zdenkowski N, Winer EP, Pfeiler G, Goetz M, Ruiz-Borrego M, Anderson D, Nowecki Z, Loibl S, Moulder S, Ring A, Fitzal F, Traina T, Chan A, Rugo HS, Lemieux J, Henao F, Lyss A, Antolin Novoa S, Wolff AC, Vetter M, Egle D, Morris PG, Mamounas EP, Gil-Gil MJ, Prat A, Fohler H, Metzger Filho O, Schwarz M, DuFrane C, Fumagalli D, Theall KP, Lu DR, Bartlett CH, Koehler M, Fesl C, DeMichele A, Gnant M. Palbociclib with adjuvant endocrine therapy in early breast cancer (PALLAS): interim analysis of a multicentre, open-label, randomised, phase 3 study. Lancet Oncol. 2021 Feb;22(2):212-222. doi: 10.1016/S1470-2045(20)30642-2. Epub 2021 Jan 15.
• Dieras V, Rugo HS, Schnell P, Gelmon K, Cristofanilli M, Loi S, Colleoni M, Lu DR, Mori A, Gauthier E, Huang Bartlett C, Slamon DJ, Turner NC, Finn RS. Long-term Pooled Safety Analysis of Palbociclib in Combination With Endocrine Therapy for HR+/HER2- Advanced Breast Cancer. J Natl Cancer Inst. 2019 Apr 1;111(4):419-430. doi: 10.1093/jnci/djy109.

Drugs

Evaluation	Drug	Modality	Dose	Route
Subject	Palbociclib	Small molecule	125 mg	Oral

Indications