Outcomes and Prognostic Factors for Locally Recurrent Rectal Cancer Treated With Proton Beam Therapy oleh Yoshiaki Takagawa, MD, Motohisa Suzuki, MD, Hisashi Yamaguchi, MD, Ichiro Seto, MD, Yusuke Azami, MD, PhD, Masanori Machida, MD, Kanako Takayama, DDS, PhD, Takuya Tominaga, DDS, Masao Murakami, MD, PhD