# Real-world Treatment Patterns and Effectiveness of Palbociclib and AI Therapy

> **NCT04176354** · — · COMPLETED · sponsor: **Pfizer** · enrollment: 813 (actual)

## Conditions studied

- Metastatic Breast Cancer

## Interventions

- **DRUG:** Palbociclib + an aromatase inhibitor
- **DRUG:** Palbociclib + Letrozole
- **DRUG:** Letrozole

## Key facts

- **NCT ID:** NCT04176354
- **Lead sponsor:** Pfizer
- **Sponsor class:** INDUSTRY
- **Phase:** —
- **Study type:** OBSERVATIONAL
- **Status:** COMPLETED
- **Start date:** 2019-01-25
- **Primary completion:** 2019-09-27
- **Final completion:** 2019-09-27
- **Target enrollment:** 813 (ACTUAL)
- **Last updated:** 2024-08-23


## Primary source

ClinicalTrials.gov registry: https://clinicaltrials.gov/study/NCT04176354

## Citation

> US National Library of Medicine, ClinicalTrials.gov registration NCT04176354, "Real-world Treatment Patterns and Effectiveness of Palbociclib and AI Therapy". Retrieved via AI Analytics 2026-06-04 from https://api.ai-analytics.org/clinical/NCT04176354. Licensed CC0.

---

*[Clinical trials dataset](/datasets/clinical-trials) · CC0 1.0*