Nivolumab With or Without Ipilimumab in Treating Patients With Refractory Metastatic Anal Canal Cancer
National Cancer Institute (NCI)
National Cancer Institute (NCI)
National Cancer Institute (NCI)
National Cancer Institute (NCI)
Eastern Cooperative Oncology Group
National Cancer Institute (NCI)
Jonsson Comprehensive Cancer Center
M.D. Anderson Cancer Center
University Health Network, Toronto
Copenhagen University Hospital at Herlev