Cancer of Unknown Primary Origin

If you have been diagnosed with a cancer that is difficult to treat because the primary site is unknown, Memorial Sloan Kettering Cancer Center is ready to help. Our doctors are experts in using the latest diagnostic tools to learn as much as possible about the tumor – and determine the most effective treatment.

Making an Appointment

Call 800-525-2225
Mon–Fri, 8:30 AM–5:30 PM, ET

Watch a video|For referring physicians

MSK Named #1 by U.S. News

U.S. News & World Report named Memorial Sloan Kettering the top hospital for cancer care in the nation. We're honored, and patient care will always be our top priority.

Pictured: Martee Hensley
Becoming a Patient: The First Steps

If you have recently been diagnosed with cancer or a related disease, we can help you understand your treatment options.

Pictured: Martee Hensley
Pictured: Christina Maggiuli
Patient Care Facilities

We provide patient care at locations in New York City and at state-of-the-art facilities in New Jersey, Long Island, and Westchester County.

Pictured: Christina Maggiuli
Pictured: Robert Motzer
Expert Care
Our team for diagnosing and treating hard-to-diagnose tumors includes Robert Motzer, a medical oncologist.