title: GLUT-1 expression and response to chemoradiotherapy in rectal cancer.
abstract: Preoperative chemoradiotherapy is used in locally advanced rectal cancer to reduce local recurrence and improve operability, however a proportion of tumors do not undergo significant regression. Identification of predictive markers of response to chemoradiotherapy would improve patient selection and may allow response modification by targeting of specific pathways. The aim of this study was to determine whether expression of glucose transporter-1 (GLUT-1) and p53 in pretreatment rectal cancer biopsies was predictive of tumor response to chemoradiotherapy. Immunohistochemical staining for GLUT-1 and p53 was performed on 69 pretreatment biopsies and compared to tumor response in the resected specimen as determined by the tumor regression grade (TRG) scoring system. GLUT-1 expression was significantly associated with reduced response to chemoradiotherapy and increasing GLUT expression correlated with poorer response (p=0.02). GLUT-1 negative tumors had a 70% probability of good response (TRG3/4) compared to a 31% probability of good response in GLUT-1 positive tumors. GLUT-1 may be a useful predictive marker of response to chemoradiotherapy in rectal cancer.
authors: Department of Surgery, Beaumont Hospital and Royal College of Surgeons in Ireland, Dublin, Ireland. sbrophy@rcsi.ie
authors: Sarah
authors: S
authors: Brophy
authors: Katherine M
authors: KM
authors: Sheehan
authors: Deborah A
authors: DA
authors: McNamara
authors: Joseph
authors: J
authors: Deasy
authors: David J
authors: DJ
authors: Bouchier-Hayes
authors: Elaine W
authors: EW
authors: Kay
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000971:Antineoplastic Combined Chemotherapy Protocols / Q000627:therapeutic use*; D014408:Biomarkers, Tumor / Q000378:metabolism; D003131:Combined Modality Therapy; D005260:Female; D051272:Glucose Transporter Type 1 / Q000378:metabolism*; D006801:Humans; D007124:Immunoenzyme Techniques; D008297:Male; D008875:Middle Aged; D011300:Preoperative Care; D011379:Prognosis; D012004:Rectal Neoplasms / Q000188:drug therapy / Q000378:metabolism* / Q000532:radiotherapy / Q000628:therapy*; D012189:Retrospective Studies; D016896:Treatment Outcome; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism
chemical_list: D014408:Biomarkers, Tumor; D051272:Glucose Transporter Type 1; C495901:TP53 protein, human; D016159:Tumor Suppressor Protein p53