To receive a personalized response to your specific questions about cancer, please call the Cancer Information Service (CIS) at 1-800-4-CANCER (1-800-422-6237) Monday through Friday from 9:00 a.m. to 4:30 p.m. to speak with a Cancer Information Specialist. Deaf and hard of hearing callers with TTY equipment may call 1-800-332-8615.