Palbociclib Plus Letrozole in Hormone Receptor Positive Residual Disease After Neoadjuvant Chemotherapy

2019-10-23 13:11:52 | BioPortfolio


PROMETEO II is a single-arm window of opportunity trial to evaluate biologic and anti-proliferative effects of palbociclib and letrozole in HR+/HER2-negative operable breast cancer (BC) patients with residual disease after neoadjuvant chemotherapy (NAC) and help to identify biomarkers for better patient selection.


This is a single-arm window of opportunity trial to evaluate biologic and anti-proliferative effects of palbociclib and letrozole in HR+/HER2-negative operable BC patients with residual disease after NAC and help to identify biomarkers for better patient selection.

The primary endpoint will be the Complete Cell Cycle Arrest (CCCA) determined by Ki67<2.7%, centrally assessed at surgery after 4 weeks of palbociclib and letrozole.

Tumor measurement will be performed by magnetic resonance imaging (MRI) for disease evaluation at screening at the end of NAC. The biopsy after chemotherapy will only be done if the tumor is equal or larger than 1 cm in its greatest diameter by MRI. Ki67% ≥ 10% after NAC by local determination will be necessary to be included in the study.

Patients will be administered palbociclib at a dose of 125 mg once daily, day 1 to day 21 followed by 7 days off treatment in a 28-day cycle and letrozole: oral, 2.5 mg per day continuously, one cycle of treatment.

After finalization of the neoadjuvant treatment, patients will undergo surgery. Surgery specimens will be collected for histological examination and biomarker analysis

The end of the study is defined as the date of post-surgery visit and will take place 4 weeks (+/- 7days) after the surgery in order to monitor the patient's safety and collect the surgery information.

Study Design


Breast Cancer


Palbociclib, Letrozole


Hospital General de Catalunya


Not yet recruiting


SOLTI Breast Cancer Research Group

Results (where available)

View Results


Published on BioPortfolio: 2019-10-23T13:11:52-0400

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