Although the largest proportion of scientific literature suggests that when cancer is highly related to genetic factors and is attributable to specific founder mutations in a given population, it is possible to perform an inexpensive screening -as compared to the cost of the complete sequencing of each gene 15, the results obtained in this study show that 84.3% of the patients carrying a mutation in BRCA1 or BRCA2 did not show any one of the previously defined founder mutations. This evidence concerns the gene BRCA1 and cancer.