title: Why do we need another tumor regression grading system for rectal cancer after neoadjuvant therapy?
authors.affiliation: São Paulo, Brazil.
authors.forename: Rodrigo O
authors.initials: RO
authors.lastname: Perez
mesh_terms: D059248:Chemoradiotherapy; D006801:Humans; D020360:Neoadjuvant Therapy; D060787:Neoplasm Grading; D018365:Neoplasm, Residual / Q000473:pathology; D011379:Prognosis; D012004:Rectal Neoplasms / Q000473:pathology* / Q000532:radiotherapy*