deltatrials
Completed PHASE3 INTERVENTIONAL 2-arm NCT01740427

A Study of Palbociclib (PD-0332991) + Letrozole vs. Letrozole For 1st Line Treatment Of Postmenopausal Women With ER+/HER2- Advanced Breast Cancer (PALOMA-2)

A RANDOMIZED, MULTICENTER, DOUBLE-BLIND PHASE 3 STUDY OF PD-0332991 (ORAL CDK 4/6 INHIBITOR) PLUS LETROZOLE VERSUS PLACEBO PLUS LETROZOLE FOR THE TREATMENT OF POSTMENOPAUSAL WOMEN WITH ER (+), HER2 (-) BREAST CANCER WHO HAVE NOT RECEIVED ANY PRIOR SYSTEMIC ANTI CANCER TREATMENT FOR ADVANCED DISEASE

Sponsor: Pfizer

Updated 33 times since 2017 Last updated: Oct 22, 2024 Started: Feb 22, 2013 Primary completion: Feb 26, 2016 Completion: Nov 9, 2023
This information is for research purposes only and is not medical advice. Consult a healthcare provider before making any medical decision.

A PHASE3 clinical study on Breast Neoplasms, this trial is completed. The trial is conducted by Pfizer and has accumulated 33 data snapshots since 2013. Oncology trials at this stage typically focus on safety, tolerability, and early efficacy signals.

Status Flow

~Jan 2017 – ~Feb 2017 · 31 days · monthly snapshot~Feb 2017 – ~Jun 2017 · 4 months · monthly snapshot~Jun 2017 – ~Jul 2017 · 30 days · monthly snapshot~Jul 2017 – ~Aug 2017 · 31 days · monthly snapshot~Aug 2017 – ~Oct 2017 · 2 months · monthly snapshot~Oct 2017 – ~Nov 2017 · 31 days · monthly snapshot~Nov 2017 – ~Mar 2018 · 4 months · monthly snapshot~Mar 2018 – ~May 2018 · 2 months · monthly snapshot~May 2018 – ~Jun 2018 · 31 days · monthly snapshot~Jun 2018 – ~Aug 2018 · 2 months · monthly snapshot~Aug 2018 – ~Oct 2018 · 2 months · monthly snapshot~Oct 2018 – ~Dec 2018 · 2 months · monthly snapshot~Dec 2018 – ~Jan 2019 · 31 days · monthly snapshot~Jan 2019 – ~Feb 2019 · 31 days · monthly snapshot~Feb 2019 – ~May 2019 · 3 months · monthly snapshot~May 2019 – ~Jun 2019 · 31 days · monthly snapshot~Jun 2019 – ~Jul 2019 · 30 days · monthly snapshot~Jul 2019 – ~Nov 2019 · 4 months · monthly snapshot~Nov 2019 – ~Mar 2020 · 4 months · monthly snapshot~Mar 2020 – ~Nov 2020 · 8 months · monthly snapshot~Nov 2020 – ~Jan 2021 · 2 months · monthly snapshot~Jan 2021 – ~Dec 2021 · 11 months · monthly snapshot~Dec 2021 – ~May 2022 · 5 months · monthly snapshot~May 2022 – ~Jul 2022 · 2 months · monthly snapshot~Jul 2022 – ~Sep 2022 · 2 months · monthly snapshot~Sep 2022 – ~Nov 2022 · 2 months · monthly snapshot~Nov 2022 – ~Jan 2023 · 2 months · monthly snapshot~Jan 2023 – ~Dec 2023 · 11 months · monthly snapshot~Dec 2023 – ~Jul 2024 · 7 months · monthly snapshot~Jul 2024 – ~Sep 2024 · 2 months · monthly snapshot~Sep 2024 – ~Dec 2024 · 3 months · monthly snapshot~Dec 2024 – ~Sep 2025 · 9 months · monthly snapshot~Sep 2025 – present · 11 months · monthly snapshot

Change History

33 versions recorded
  1. Sep 2025 — Present [monthly]

    Completed PHASE3

  2. Dec 2024 — Sep 2025 [monthly]

    Completed PHASE3

  3. Sep 2024 — Dec 2024 [monthly]

    Completed PHASE3

  4. Jul 2024 — Sep 2024 [monthly]

    Completed PHASE3

  5. Dec 2023 — Jul 2024 [monthly]

    Completed PHASE3

    Status: Active Not RecruitingCompleted

Show 28 earlier versions
  1. Jan 2023 — Dec 2023 [monthly]

    Active Not Recruiting PHASE3

  2. Nov 2022 — Jan 2023 [monthly]

    Active Not Recruiting PHASE3

  3. Sep 2022 — Nov 2022 [monthly]

    Active Not Recruiting PHASE3

  4. Jul 2022 — Sep 2022 [monthly]

    Active Not Recruiting PHASE3

  5. May 2022 — Jul 2022 [monthly]

    Active Not Recruiting PHASE3

  6. Dec 2021 — May 2022 [monthly]

    Active Not Recruiting PHASE3

  7. Jan 2021 — Dec 2021 [monthly]

    Active Not Recruiting PHASE3

  8. Nov 2020 — Jan 2021 [monthly]

    Active Not Recruiting PHASE3

  9. Mar 2020 — Nov 2020 [monthly]

    Active Not Recruiting PHASE3

  10. Nov 2019 — Mar 2020 [monthly]

    Active Not Recruiting PHASE3

  11. Jul 2019 — Nov 2019 [monthly]

    Active Not Recruiting PHASE3

  12. Jun 2019 — Jul 2019 [monthly]

    Active Not Recruiting PHASE3

  13. May 2019 — Jun 2019 [monthly]

    Active Not Recruiting PHASE3

  14. Feb 2019 — May 2019 [monthly]

    Active Not Recruiting PHASE3

  15. Jan 2019 — Feb 2019 [monthly]

    Active Not Recruiting PHASE3

  16. Dec 2018 — Jan 2019 [monthly]

    Active Not Recruiting PHASE3

  17. Oct 2018 — Dec 2018 [monthly]

    Active Not Recruiting PHASE3

  18. Aug 2018 — Oct 2018 [monthly]

    Active Not Recruiting PHASE3

  19. Jun 2018 — Aug 2018 [monthly]

    Active Not Recruiting PHASE3

  20. May 2018 — Jun 2018 [monthly]

    Active Not Recruiting PHASE3

  21. Mar 2018 — May 2018 [monthly]

    Active Not Recruiting PHASE3

  22. Nov 2017 — Mar 2018 [monthly]

    Active Not Recruiting PHASE3

  23. Oct 2017 — Nov 2017 [monthly]

    Active Not Recruiting PHASE3

  24. Aug 2017 — Oct 2017 [monthly]

    Active Not Recruiting PHASE3

    Status: SuspendedActive Not Recruiting

  25. Jul 2017 — Aug 2017 [monthly]

    Suspended PHASE3

    Status: Active Not RecruitingSuspended

  26. Jun 2017 — Jul 2017 [monthly]

    Active Not Recruiting PHASE3

  27. Feb 2017 — Jun 2017 [monthly]

    Active Not Recruiting PHASE3

  28. Jan 2017 — Feb 2017 [monthly]

    Active Not Recruiting PHASE3

    First recorded

Feb 2013

Trial started

Per CT.gov start date — pre-dates our first snapshot

Eligibility Summary

No eligibility information available.

Contact Information

Sponsor contact:
  • Pfizer
Data source: Pfizer

For direct contact, visit the study record on ClinicalTrials.gov .