title: Association of thymidylate synthase polymorphisms with the tumor response to preoperative chemoradiotherapy in rectal cancer: a systematic review and meta-analysis.
abstract: Preoperative chemoradiotherapy (pCRT) followed by surgery is currently the standard therapy for patients with locally advanced rectal cancer. It is very important to develop biomarkers to prior identify the patients who have a higher likelihood of responding to pCRT. Recently, a series of studies have been conducted to investigate the association of thymidylate synthase (TYMS) polymorphisms with the tumor response to pCRT in rectal cancer, but the results were not consistent and conclusive. In the present study, we performed a systematic literature search for relevant studies up to 30 March 2015 and conducted a meta-analysis to summarize and clarify the association between the TYMS polymorphisms and the tumor response to pCRT in rectal cancer. Finally, 7 studies containing 892 cases for TYMS 2R/3R polymorphism, 7 studies involving 715 cases for TYMS 1494del6 polymorphism and 6 studies containing 616 cases for TYMS 5' untranslated region (UTR) expression allele polymorphism were analyzed in the meta-analysis. The results suggested that TYMS 2R/3R was associated with the response and the patients with 2R/2R or 2R/3R genotype with rectal cancer might benefit more from pCRT than others. On the contrary, neither 1494del6 nor 5'UTR expression allele polymorphisms was associated with the response to pCRT.
authors.affiliation: Department of General Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing Key Laboratory of Cancer Invasion and Metastasis Research &National Clinical Research Center of Digestive Diseases, Beijing, China.
authors.forename: Y C
authors.initials: YC
authors.lastname: Yang
authors.affiliation: Department of General Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing Key Laboratory of Cancer Invasion and Metastasis Research &National Clinical Research Center of Digestive Diseases, Beijing, China.
authors.forename: G C
authors.initials: GC
authors.lastname: Wu
authors.affiliation: Department of General Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing Key Laboratory of Cancer Invasion and Metastasis Research &National Clinical Research Center of Digestive Diseases, Beijing, China.
authors.forename: L
authors.initials: L
authors.lastname: Jin
authors.affiliation: Department of General Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing Key Laboratory of Cancer Invasion and Metastasis Research &National Clinical Research Center of Digestive Diseases, Beijing, China.
authors.forename: K L
authors.initials: KL
authors.lastname: Wang
authors.affiliation: Department of General Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing Key Laboratory of Cancer Invasion and Metastasis Research &National Clinical Research Center of Digestive Diseases, Beijing, China.
authors.forename: Z G
authors.initials: ZG
authors.lastname: Bai
authors.affiliation: Department of General Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing Key Laboratory of Cancer Invasion and Metastasis Research &National Clinical Research Center of Digestive Diseases, Beijing, China.
authors.forename: J
authors.initials: J
authors.lastname: Wang
authors.affiliation: Department of General Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing Key Laboratory of Cancer Invasion and Metastasis Research &National Clinical Research Center of Digestive Diseases, Beijing, China.
authors.forename: Z T
authors.initials: ZT
authors.lastname: Zhang
mesh_terms: D020121:5' Untranslated Regions; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D059186:Chemoradiotherapy, Adjuvant; D005260:Female; D005838:Genotype; D006801:Humans; D008297:Male; D008875:Middle Aged; D020360:Neoadjuvant Therapy; D016017:Odds Ratio; D018579:Patient Selection; D010597:Pharmacogenetics; D000071185:Pharmacogenomic Testing; D000071184:Pharmacogenomic Variants; D010641:Phenotype; D011110:Polymorphism, Genetic; D057285:Precision Medicine; D011237:Predictive Value of Tests; D012004:Rectal Neoplasms / Q000201:enzymology / Q000235:genetics / Q000473:pathology / Q000628:therapy*; D012307:Risk Factors; D013940:Thymidylate Synthase / Q000235:genetics*; D016896:Treatment Outcome
chemical_list: D020121:5' Untranslated Regions; C000600377:TYMS protein, human; D013940:Thymidylate Synthase