The Breast Center The Breast Center 50 South San Mateo Drive, Suite 120 San Mateo, CA 94401 Phone: (650) 696-4140 Hours of Operation: Monday, Tuesday, Thursday, Friday, 8:30am - 5:00pm Wednesday, 8:30am - 7:30pm Saturday afternoons as needed Services Offered: Breast Imaging, Biopsy, and Consultation Click here for directions