Association of common variants on chromosome 8q24 with gastric cancer in Venezuelan patients.
Gastric cancer remains one of the leading causes of death in the world, being Central and South America among the regions showing the highest incidence and mortality rates worldwide. Although several single nucleotide polymorphisms (SNPs) identified in the chromosomal region 8q24 by genome-wide association studies have been related with the risk of different kinds of cancers, their role in the susceptibility of gastric cancer in Latin American populations has not been evaluated yet. Hereby, we performed a case-control study to explore the associations between three SNPs at 8q24 and gastric cancer risk in Venezuelan patients. We analyzed rs1447295, rs4733616 and rs6983267 SNPs in 122 paraffin-embedded tumor samples from archival bank and 129 samples with chronic gastritis (obtained by upper endoscopy during the study) from the Central Hospital of Barquisimeto (Lara, Venezuela). Genotypes were determined by PCR-RFLP reactions designed in this study for efficient genotyping of formalin-fixed/paraffin-embedded tissues. No significant differences in genotype frequencies between case and control groups were found. However, carriers of the homozygous TT genotype of SNP rs4733616 had an increased risk of developing poorly differentiated gastric cancer according to the codominant (OR=3.59, P=0.035) and the recessive models (OR=4.32, P=0.014, best-fitting model of inheritance), adjusted by age and gender. Our study suggests that the SNP rs4733616 is associated with susceptibility to poorly differentiated gastric cancer in Venezuelans. Additional studies are needed to further interrogate the prognostic value of the rs4733616 marker in this high-risk population for gastric cancer.
Laboratorio de Genética Molecular "Dr. Jorge Yunis-Turbay", Decanato de Ciencias de la Salud, Universidad Centroccidental Lisandro Alvarado (UCLA), Barquisimeto 3001, Venezuela. Electronic address: luis.labrador@ucla.edu.ve.
Luis
L
Labrador
Laboratorio de Genética Molecular "Dr. Jorge Yunis-Turbay", Decanato de Ciencias de la Salud, Universidad Centroccidental Lisandro Alvarado (UCLA), Barquisimeto 3001, Venezuela. Electronic address: keilatorres@ucla.edu.ve.
Keila
K
Torres
Laboratorio de Genética Molecular "Dr. Jorge Yunis-Turbay", Decanato de Ciencias de la Salud, Universidad Centroccidental Lisandro Alvarado (UCLA), Barquisimeto 3001, Venezuela. Electronic address: mariaecamargo@ucla.edu.ve.
Maria
M
Camargo
Laboratorio de Genética Molecular "Dr. Jorge Yunis-Turbay", Decanato de Ciencias de la Salud, Universidad Centroccidental Lisandro Alvarado (UCLA), Barquisimeto 3001, Venezuela. Electronic address: laskhmikristal@gmail.com.
Laskhmi
L
Santiago
Departamento de Anatomía Patología, Hospital Antonio María Pineda-UCLA, Barquisimeto 3001, Venezuela. Electronic address: elvisvalderrama@hotmail.com.
Elvis
E
Valderrama
Laboratorio de Genética Molecular "Dr. Jorge Yunis-Turbay", Decanato de Ciencias de la Salud, Universidad Centroccidental Lisandro Alvarado (UCLA), Barquisimeto 3001, Venezuela. Electronic address: mchiurillo@ucla.edu.ve.
Miguel Angel
MA
Chiurillo
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002898:Chromosomes, Human, Pair 8; D005260:Female; D005819:Genetic Markers; D006801:Humans; D008297:Male; D008875:Middle Aged; D020641:Polymorphism, Single Nucleotide; D013274:Stomach Neoplasms / Q000235:genetics*; D014687:Venezuela
D005819:Genetic Markers
8q24; Gastric cancer; Histologic differentiation; SNPs; Susceptibility