title: Oestrogen receptor-β CA repeat polymorphism is associated with incidence of colorectal cancer among females.
abstract: OBJECTIVE
  Increasing evidence suggests an association between oestrogens and colorectal cancer. Oestrogen receptor beta, ER-β, putatively plays a pathobiological role in colorectal cancer as colorectal epithelial cells frequently express ER-β. The aim was to elucidate the association of the dinucleotide (CA) repeat polymorphism of the ER-β gene (ESR2) with colorectal cancer.
  
  
  RESULTS
  Deoxyribonucleic acids extracted from the renal cortex of 1488 Japanese autopsies with complete clinical/pathological data were studied. CA repeat polymorphism was determined by polymerase chain reaction using fluorescein-labelled primers. Patients were divided into three genotype groups according to the number of CA repeats of each allele (S < 22, L ≥ 22); SS (with two S alleles), SL (with one each S and L allele) and LL (with two L alleles). The presence/absence of colorectal cancers was determined by examining the clinical records and autopsy material. The incidence of colorectal cancer was significantly different according to the ESR2 CA repeat genotype only among females (SS, 37/202 = 18.3%; SL, 19/332 = 5.7%; LL, 5/155 = 3.2%, P < 0.0001). Immunohistochemically, cancers in females with the SS genotype, but not the SL genotype, frequently expressed the C-terminus portion of ER-β1 (wild-type ER-β).
  
  
  CONCLUSIONS
  A role for ESR2 CA repeat polymorphism in the pathogenesis of colorectal cancer among females is suggested.
authors: Research Team for Geriatric Pathology, Tokyo Metropolitan Institute of Gerontology, Japan. nhonma@tmig.or.jp
authors: Naoko
authors: N
authors: Honma
authors: Tomio
authors: T
authors: Arai
authors: Kaiyo
authors: K
authors: Takubo
authors: Mamoun
authors: M
authors: Younes
authors: Noriko
authors: N
authors: Tanaka
authors: Makiko Naka
authors: MN
authors: Mieno
authors: Kohei
authors: K
authors: Tamura
authors: Shinobu
authors: S
authors: Ikeda
authors: Motoji
authors: M
authors: Sawabe
authors: Masaaki
authors: M
authors: Muramatsu
mesh_terms: D000230:Adenocarcinoma / Q000453:epidemiology / Q000235:genetics* / Q000378:metabolism; D000369:Aged, 80 and over; D015179:Colorectal Neoplasms / Q000453:epidemiology / Q000235:genetics* / Q000378:metabolism; D018900:Dinucleotide Repeats; D047629:Estrogen Receptor beta / Q000235:genetics* / Q000378:metabolism; D005260:Female; D020022:Genetic Predisposition to Disease; D006801:Humans; D015994:Incidence; D008297:Male; D011110:Polymorphism, Genetic
chemical_list: D047629:Estrogen Receptor beta