Updated Japanese multicenter registry study evaluates the efficacy and safety of proton beam therapy for treating extrahepatic cholangiocarcinoma

H Hideya Yamazaki K Kei Shibuya T Takuya Kimoto M Motohisa Suzuki M Masao Murakami K Kazuki Terashima T Tomoaki Okimoto T Takashi Iizumi H Hideyuki Sakurai M Masaru Wakatsuki T Takashi Ogino T Takeshi Arimura M Masaru Takagi M Masayuki Araya T Takahiro Waki S Sae Matsumoto H Hiroyuki Ogino N Norio Katoh T Takayuki Hashimoto H Hidehiro Hojo N Nobuyoshi Fukumitsu T Takumi Fukumoto M Masayuki Ohtsuka