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  • Title: Cholecystokinin receptor A gene polymorphism in gallstone disease and gallbladder cancer.
    Author: Srivastava A, Pandey SN, Dixit M, Choudhuri G, Mittal B.
    Journal: J Gastroenterol Hepatol; 2008 Jun; 23(6):970-5. PubMed ID: 17944886.
    Abstract:
    BACKGROUND AND AIM: Gallbladder carcinoma (GBC) usually arises in the background of gallstone disease which may be causatively related to decreased gallbladder contractility. Cholecystokinin receptor A (CCK-AR) mediates signals resulting in gallbladder contraction. Deteriorating gallbladder contraction promotes gallstone formation. A common genetic polymorphism of CCK-AR may be causatively associated with the risk of gallstone and GBC. This study aimed to understand the association of CCK-AR Pst I polymorphism in gallstone disease with gallbladder cancer. METHOD: This study included 165 gallstone patients, 139 GBC patients, and 190 healthy subjects. Genotyping was done using the polymerase chain reaction-restriction fragment length polymorphism (PCR-RFLP) method. RESULTS: The frequency of the A1A1 genotype of CCK-AR was significantly higher in gallstone patients than healthy individuals (P = 0.008 odds ratio [OR] = 2.25, and 95% confidence interval [CI]:1.2-4.1). However, there was a significant difference in the frequency of A1A1 genotype when gallstone patients were compared to GBC patients (P = 0.041, OR = 0.49, and 95% CI: 0.3-0.9). On stratification of GBC patients according to presence or absence of gallstones, GBC patients without stones were compared to controls and GBC patients with stones were compared to stone patients; however, no significant differences in frequencies were observed. CONCLUSION: The results suggest that the A1A1 genotype of CCK-AR is an independent genetic risk factor for gallstone disease and does not modulate the susceptibility of gallbladder cancer.
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