Determination of vhl gene mutations in sporadic renal cell carcinoma.

OBJECTIVE

Characterization of the molecular status of the vhl gene and its relationship to the usual prognostic factors could help establish new diagnostic and therapeutic strategies. This study determines the presence of vhl gene mutations in tumor tissue from patients with sporadic renal cell carcinoma, the relationship between the mutations and classic prognostic factors, and the possible impact on protein function.

MATERIALS AND METHOD

Cross-sectional analytical study investigating vhl gene mutations in tumor tissue by PCR testing of the gene exons and automatic sequencing in 96 patients with sporadic renal cell carcinoma. The characteristics of the mutations detected, as well as their relationship with various clinical and pathological parameters and the possible impact on protein function, were analyzed.

RESULTS

Twenty-two mutations were found in 21 patients (21.9%); 68.2% were point mutations. The mutations were associated only with tumor histotype and were located in protein functional domains. Three mutations were detected in the intron position; 73.7% were considered relevant to protein function.

CONCLUSION

The percentage of vhl gene mutations in sporadic renal cell carcinoma was relatively low, mutations were seen more often in clear cell carcinoma and were not related to the classic clinical prognostic factors. Mutations of the vhl gene produce important changes in the protein, causing it to lose its tumor suppressor function.