A case of an advanced renal collecting duct carcinoma in which initial therapeutic effect was achieved with pembrolizumab plus axitinib oleh Yuichiro Atagi, Kei Daizumoto, Shinsuke Mohri, Kai Somiya, Daisuke Seto, Shigeo Nakanishi, Yutaka Yanagihara, Iku Ninomiya, Kenjiro Okamoto, Sadamu Yamashi