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Study of LEE011, BYL719 and Letrozole in Advanced ER+ Breast Cancer

NCT01872260 · Status: ACTIVE_NOT_RECRUITING · Phase: PHASE1/PHASE2 · Type: INTERVENTIONAL · Enrollment: 255

Last updated 2026-04-01

No results posted yet for this study

Summary

The purpose of this trial is to inform the future clinical development of the two investigational agents in ER+ breast cancer, LEE011 (CDK4/6 inhibitor) and BYL719 (PI3K-alpha inhibitor).

This is a multi-center, open-label Phase Ib study. The Phase Ib dose escalation will estimate the MTD and/or RP2D for three regimens: two double combinations, LEE011 with letrozole and BYL719 with letrozole, followed by triple combinations of LEE011 + BYL719 with letrozole (Arms 3 and 4).

The Phase Ib dose escalation part will be followed by Phase Ib dose expansions to further characterize the safety, tolerability, PK and preliminary clinical anti-tumor activity of the combinations. Optional crossover for patients who have progressed while on dose escalation or dose expansion with doublet treatment on Arms 1 or 2 to be treated with the triplet combination (Arm 3) after the determination of the RP2D for Arm 3; is no longer permitted after protocol amendment 6.

Approximately 270 adult women with ER+/HER2- locally advanced or metastatic breast cancer will be enrolled.

Conditions

Interventions

DRUG

LEE011

LEE011 - 28 day cycles (21 days followed by a 7 day break) for Arms 1, 3. LEE011 28 days cycles (continuous) Arm 4.

DRUG

Letrozole

Letrozole 2.5 mg/day

DRUG

BYL719

BYL719 - 28 days cycle (continuous) for Arm 2; 3 and 4

Sponsors & Collaborators

Principal Investigators

  • Novartis Pharmaceuticals · Novartis Pharmaceuticals

Study Design

Allocation
RANDOMIZED
Purpose
TREATMENT
Masking
NONE
Model
PARALLEL

Eligibility

Min Age
18 Years
Max Age
100 Years
Sex
FEMALE
Healthy Volunteers
No

Timeline & Regulatory

Start
2013-10-22
Primary Completion
2027-02-26
Completion
2027-02-26
FDA Drug
Yes

Countries

  • United States
  • Australia
  • France
  • Italy
  • South Korea
  • Spain
  • Switzerland
  • United Kingdom

Study Locations

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Entities

Drugs
Diseases
Companies

Read the full study record

This page highlights key information. For complete eligibility criteria, study locations, investigator contacts, and the full protocol, visit the original record on ClinicalTrials.gov.

View NCT01872260 on ClinicalTrials.gov