Clinical Trial

Treatment of Breast Cancer

Study Description

To Evaluate the Safety, Tolerability, and Pharmacokinetics of GDC-0077 Single Agent in Participants With Solid Tumors and in Combination With Endocrine and Targeted Therapies in Participants With Breast Cancer

This is an open-label, multicenter, Phase I study designed to evaluate the safety, tolerability, and pharmacokinetics of GDC-0077 administered orally as a single agent in participants with locally advanced or metastatic Phosphatidylinositol-4,5-Bisphosphate 3-Kinase Catalytic Subunit Alpha (PIK3CA)-mutant solid tumors, including breast cancer, and in combination with standard-of-care endocrine and targeted therapies for the treatment of locally advanced or metastatic PIK3CA-mutant hormone receptor-positive (HR+)/human epidermal growth factor receptor 2 negative (HER2-) breast cancer. Participants will be enrolled in two stages: a dose-escalation stage (Stage I) and an expansion stage (Stage II). Participants will be assigned to one of six regimens: GDC-0077 as a single agent (Arm A), GDC-0077 in combination with palbociclib and letrozole (Arm B), GDC-0077 in combination with letrozole (Arm C), GDC-0077 in combination with fulvestrant (Arm D), GDC-0077 in combination with palbociclib and fulvestrant (Arm E), and GDC-0077 in combination with palbociclib, fulvestrant, and metformin (Arm F).

Location

Locations Selected Location

Methods

Pharmaceutical medication involved Pharmaceutical medication involved
Recruiting patients only Recruiting patients only

Drug - GDC-0077

Participants will receive oral GDC-0077 once daily on Days 1-28 of each cycle.

Drug - Fulvestrant

Participants will receive fulvestrant 500 mg, administered intramuscularly on Days 1 and 15 of Cycle 1. For subsequent cycles, participants will receive fulvestrant intramuscularly on Day 1 of each cycle.

Drug - Letrozole

Participants will receive once daily oral doses of letrozole 2.5 mg on Days 1−28 of each cycle.

Drug - Palbociclib

Participants will receive once daily oral doses of palbociclib 125 mg on Days 1−21 of each cycle.

Drug - Metformin

Participants will receive oral metformin once daily, starting on Cycle 1, Day 1, as tolerated.

Additional Information

Official Study Title

A Phase I, Open-Label, Dose-Escalation Study Evaluating the Safety, Tolerability, and Pharmacokinetics of GDC-0077 as a Single Agent in Patients With Locally Advanced or Metastatic PIK3CA-Mutant Solid Tumors and in Combination With Endocrine and Targeted Therapies in Patients With Locally Advanced or Metastatic PIK3CA-Mutant Hormone-Receptor Positive Breast Cancer

Clinical Trial ID

NCT03006172

ParticipAid ID

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