title: p53 immunohistochemical staining predicts residual disease after chemoradiation in patients with high-risk rectal cancer.
abstract: This study was conducted to investigate the value of p53 immunohistochemical staining of pretreatment biopsy specimens in predicting the response of rectal cancer to chemoradiation. The study group comprised 42 patients with high-risk rectal cancer treated between July 1990 and July 1995 with a preoperative chemoradiation regimen of 45 Gy of external-beam irradiation and continuous-infusion 5-fluorouracil followed by surgical resection. p53 immunohistochemical staining was performed on pretreatment biopsy specimens. p53 immunohistochemical staining pattern and standard clinical and pathological parameters were correlated with extent of residual cancer in the surgical specimen. Twenty tumors were positive for p53 on immunohistochemical staining, 19 were negative, and 3 were focally positive. Thirteen patients experienced a complete response to chemoradiation. Aberrant p53 protein accumulation, as measured by immunohistochemical staining, correlated inversely with a complete pathological response to chemoradiation (P = 0.005; correlation coefficient = -0.43) and directly with an increased likelihood of residual cancer in the lymph nodes of surgical specimens (P = 0.02; correlation coefficient = 0.39). p53 immunohistochemical staining of pretreatment biopsy specimens correlates with the extent of residual disease after chemoradiation in patients with high-risk rectal cancer.
authors.affiliation: Departments of Surgical Oncology, The University of Texas M.D. Anderson Cancer Center, Houston, Texas 77030, USA.
authors.forename: F R
authors.initials: FR
authors.lastname: Spitz
authors.forename: G G
authors.initials: GG
authors.lastname: Giacco
authors.forename: K
authors.initials: K
authors.lastname: Hess
authors.forename: L
authors.initials: L
authors.lastname: Larry
authors.forename: T A
authors.initials: TA
authors.lastname: Rich
authors.forename: N
authors.initials: N
authors.lastname: Janjan
authors.forename: K R
authors.initials: KR
authors.lastname: Cleary
authors.forename: J M
authors.initials: JM
authors.lastname: Skibber
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000964:Antimetabolites, Antineoplastic / Q000627:therapeutic use*; D014408:Biomarkers, Tumor / Q000032:analysis*; D001706:Biopsy; D002454:Cell Differentiation; D017024:Chemotherapy, Adjuvant; D003131:Combined Modality Therapy; D005260:Female; D005472:Fluorouracil / Q000627:therapeutic use*; D006801:Humans; D007124:Immunoenzyme Techniques; D008207:Lymphatic Metastasis; D008297:Male; D008875:Middle Aged; D009363:Neoplasm Proteins / Q000032:analysis*; D018365:Neoplasm, Residual; D011237:Predictive Value of Tests; D011300:Preoperative Care; D018714:Radiotherapy, Adjuvant; D012004:Rectal Neoplasms / Q000737:chemistry* / Q000188:drug therapy / Q000473:pathology / Q000532:radiotherapy / Q000601:surgery; D012074:Remission Induction; D012189:Retrospective Studies; D012306:Risk; D016159:Tumor Suppressor Protein p53 / Q000032:analysis*
chemical_list: D000964:Antimetabolites, Antineoplastic; D014408:Biomarkers, Tumor; D009363:Neoplasm Proteins; D016159:Tumor Suppressor Protein p53; D005472:Fluorouracil