Novel case of androgen receptor-positive cancer of unknown primary without serum prostate-specific antigen elevation that became progression free in the long term after primary combined androgen blockade. - Matsuyama N; Naiki T; Naiki-Ito A; Chaya R; Kawai T; Etani T; Nagai T; Kato H; Kubota Y; Yasui T (IJU case reports, 2020)