The MyMSK patient portal allows Memorial Sloan Kettering Cancer Center patients and caregivers to easily manage their cancer care online. ... the MyMSK Help Desk at 646-227-2593 Monday through Friday from 8 a.m. to 6 p.m.(Eastern time). ×. MyMSK Patient Portal: Your Cancer Care at Memorial Sloan Kettering. ... or wait for the login screen to ....