Memorial Sloan Kettering Cancer Center Sleepy Hollow provides outstanding ambulatory cancer care in an outpatient facility that is convenient for residents of Westchester County and the Hudson Valley. We offer chemotherapy and infusion services, radiation therapy, and support services to help you during and after treatment. Our staff includes medical oncologists and radiation oncologists who are experts in a wide range of cancers, including breast, prostate, lung, colorectal, hematologic, and gynecologic cancers.