Patricia Rios-Ibarra C, Janeth Rodriguez-Silva C, Alonso Lopez-Chuken Y, Ortiz-Lopez R, Fernandez-Castillo E, Beatriz Del Toro Runzer C, Paul Armenta-Perez V, Flores-Gutierrez JP, Quintanilla-Guzman A, Salinas-Santander M, Gonzalez-Guerrero JF, Bosques-Padilla F, Santos A, Guadalupe Martinez-Rodriguez H. Thymidylate synthase polymorphism in Mexican patients with colon cancer treated with 5-fluorouracil.
J BUON 2016;
21:935-940. [PMID:
27685916]
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Abstract
PURPOSE
We analyzed the genotype and allele frequency of variable number tandem repeats (VNTR)-thymidylate synthase (TS) and its relationship with the disease evolution in colon cancer patients.
METHODS
We selected 24 paraffin-embedded colon cancer tissue samples from Mexican patients who received a 5-fluorouracil (5-FU)-based chemotherapy regimen. Tumor tissue was digested with proteinase K and genomic DNA was isolated by the standard method with phenol-chloroform extraction. Polymerase chain reaction (PCR) was performed for TS genotyping of VNTR and the results were evaluated directly in a stained agarose gel.
RESULTS
The allele frequency of 2 repeats (2R) was greater (0.66) than 3R (0.34) in metastatic colon cancer (x2=10.24; p=0.001)) however, no difference in allelic distribution between 2R (0.54) and 3R (0.46) in non metastatic patients was observed (x2=0.640; p=0.424).
CONCLUSION
Our results suggest that Mexican patients with colon cancer present differences in the allelic distribution, the 2R allele being the most frequent.
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