Circulating Tumor DNA Predicts Pathologic and Clinical Outcomes Following Neoadjuvant Chemoradiation and Surgery for Patients With Locally Advanced Rectal Cancer. - McDuff SGR; Hardiman KM; Ulintz PJ; Parikh AR; Zheng H; Kim DW; Lennerz JK; Hazar-Rethinam M; Van Seventer EE; Fetter IJ; Nadres B; Eyler CE; et al. (JCO precision oncology, 2021)