title: Nonstandard protocol for treatment of carcinoma esophagus does not suffice for identification of prognostic markers in retrospective study.
authors.forename: Abhishek
authors.initials: A
authors.lastname: Puri
authors.forename: Sheh
authors.initials: S
authors.lastname: Rawat
authors.forename: Pranav
authors.initials: P
authors.lastname: Chadha
mesh_terms: D002294:Carcinoma, Squamous Cell / Q000188:drug therapy / Q000473:pathology / Q000532:radiotherapy; D003131:Combined Modality Therapy / Q000379:methods; D004938:Esophageal Neoplasms / Q000188:drug therapy / Q000473:pathology / Q000532:radiotherapy; D016629:Esophagectomy; D006801:Humans; D009364:Neoplasm Recurrence, Local / Q000601:surgery; D010778:Photochemotherapy; D011879:Radiotherapy Dosage / Q000592:standards; D012074:Remission Induction; D012189:Retrospective Studies; D016879:Salvage Therapy