How do I cancel my monthly credit card donation? 1 month ago Updated To cancel your monthly credit card donation don't hesitate to get in touch with Donor Support at donorsupport@su2c.org or by calling 1-800-204-5809. Recently viewed articlesAre donations made to my livesteam tax deductible?Are auctions benefitting Stand Up To Cancer allowed?Is my donation to Stand Up To Cancer tax deductible?How does my stream benefit Stand Up To Cancer? Related articles Are donations made to my livesteam tax deductible? Are auctions benefitting Stand Up To Cancer allowed? What hours are your Donor Support representatives available? How do I find out if my employer offers employee matching contributions for Stand Up To Cancer?