Nivolumab With or Without Ipilimumab in Treating Patients With Refractory Metastatic Anal Canal Cancer
National Cancer Institute (NCI)
National Cancer Institute (NCI)
AIDS Malignancy Consortium
National Cancer Institute (NCI)
National Cancer Institute (NCI)
Institut du Cancer de Montpellier - Val d'Aurelle
Eastern Cooperative Oncology Group
Duke University
Instituto do Cancer do Estado de São Paulo
University of California, San Francisco
AHS Cancer Control Alberta
Karolinska Institutet
AIDS Malignancy Consortium