Metformin Hydrochloride in Preventing Breast Cancer in Patients With Atypical Hyperplasia or In Situ Breast Cancer

Mount Sinai Hospital, New York

NYP/Columbia University Medical Center/Herbert Irving Comprehensive Cancer Center, New York

Roswell Park Cancer Institute, Buffalo

Duke University Medical Center, Durham

Prisma Health Cancer Institute - Spartanburg, Boiling Springs

Greenville Health System Cancer Institute-Andrews, Greenville

Prisma Health Cancer Institute - Butternut, Greenville

Prisma Health Cancer Institute - Faris, Greenville

Prisma Health Greenville Memorial Hospital, Greenville

Prisma Health Cancer Institute - Eastside, Greenville

Prisma Health Cancer Institute - Easley, Easley

Prisma Health Cancer Institute - Greer, Greer

Prisma Health Cancer Institute - Seneca, Seneca

Ohio State University Comprehensive Cancer Center, Columbus

The Christ Hospital, Cincinnati

The Community Hospital, Munster

University of Wisconsin Carbone Cancer Center, Madison

Mayo Clinic in Rochester, Rochester

University of Kansas Cancer Center, Kansas City

Cotton O'Neil Cancer Center / Stormont Vail Health, Topeka

University of Oklahoma Health Sciences Center, Oklahoma City

M D Anderson Cancer Center, Houston

Doctor's Hospital of Laredo, Laredo

Los Angeles County-USC Medical Center, Los Angeles

USC / Norris Comprehensive Cancer Center, Los Angeles

City of Hope Comprehensive Cancer Center, Duarte

City of Hope South Pasadena, South Pasadena