Mskcc Portal Rentals. MyMSK Patient Portal - Memorial Sloan Kettering Cancer Center; Rentals Details: We're here to help!If you need some help about MyMSK, you can use this link to email the MyMSK Help Desk, or email us at [email protected]mskcc.org .You can also call the MyMSK Help Desk toll free at 646-227-2593 in New York City, or call toll free outside New York City at 800-248-0593 ....