Prognostic Impact of Arterial Phase Hyperenhancement After Proton Beam Therapy for Untreated Solitary Hepatocellular Carcinoma - Hikaru Niitsu; Masashi Mizumoto; Yinuo Li; Masahiko Harada; Takuya Sawada; Masaaki Goto; Taisuke Sumiya; Keiichiro Baba; Takeshi Fujisawa; Masatoshi Nakamura; Toshiki Ishida; Takashi Iizumi; et al. (Cancer Medicine, 2026)