Safety results of the Canadian Expanded Access Program (EAP) of palbociclib (PAL) plus letrozole (L) in postmenopausal patients (pts) with hormone receptor-positive (HR+)/human epidermal growth factor receptor 2-negative (HER2-) advanced breast cancer (ABC) deemed appropriate candidates for first-line (1L) endocrine therapy (ET) with L.
Bibliographic record
Abstract
e12534 Background: In the PALOMA-2 study, 1L PAL+L prolonged progression-free survival in women with estrogen receptor-positive/HER2- ABC vs placebo + L (hazard ratio 0.58; P< 0.001). Here we assess a cohort of Canadian pts treated with 1L PAL+L for ABC in an EAP study (NCT02142868). Methods: This was an open-label, single-arm study of US and Canadian postmenopausal women (N = 337) with HR+/HER2- ABC for whom 1L ET with L was deemed appropriate. The primary objective was to allow pt access to PAL in combination with L. PAL (125 mg/d orally [3 wk on, 1 wk off]) was administered with L (2.5 mg orally QD) until PAL was commercially available. Secondary objectives included safety and patient-reported outcomes (PROs). Results: 96/97 (99%) treated/enrolled Canadian pts were assessed for safety and PROs (treated pt characteristics: median age 62.5 y, white/Asian [89%/7%], metastatic sites bone/lung/liver [71%/25%/17%], ECOG PS 0-1/2 [93%/7%], 89% with prior systemic anticancer treatment [tx]). Median exposure was 4 x 28 d cycles of tx, and the median average PAL dose was 125 mg/d. All-causality treatment-emergent adverse events (AEs) were reported in 100% pts; 68% had grade 3/4 events, the most common events were neutropenia (61%), infections (3%), and alanine aminotransferase increase (3%). Grade 4 neutropenia and grade 3 febrile neutropenia were reported in 2% and 1% of pts, respectively. Due to AEs, PAL was temporarily discontinued in 59% and 31% had ≥1 dose reduction. The main reasons pts permanently discontinued from the study were sponsor study termination, 77%; objective progression, 11%; and AE related/unrelated to study drug, 6%/2%. All EQ-5D questions were completed by 96% pts at baseline and 85% by end of tx (EOT). At EOT, the median EQ-5D index and the EQ visual analog scale scores were not significantly changed from baseline. Conclusions: A safe and tolerable profile was observed for PAL+L in 1L treatment of Canadian pts with HR+/HER2− ABC, consistent with other studies. Sponsor Pfizer Clinical trial information: NCT02142868.
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.001 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.003 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".