Utility of circulating tumour DNA for prognosis and prediction of therapeutic effect in locally recurrent rectal cancer: study protocol for a multi-institutional, prospective obser... by Atsuo Takashima, Masaaki Ito, Yukihide Kanemitsu, Tadayoshi Hashimoto, Yuichiro Tsukada, Keisuke Kanato, Junki Mizusawa, Haruhiko Fukuda, Shunsuke Tsukamoto

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