ASO Author Reflections: Response to Neoadjuvant Chemotherapy Strengthens the Prognostic Impact of Pathological Stage for Esophageal Squamous Cell Carcinoma. - Matsuda S; Kawakubo H; Okamura A; Takahashi K; Toihata T; Takemura R; Mayanagi S; Takeuchi H; Watanabe M; Kitagawa Y (Annals of surgical oncology, 2021)