It emerged that the presence of ovarian cancer or known predisposing factors (BRCA1 mutation, age, etc.)is seemingly associated with an altered and unfavorable local bacterial community, as it is low in Lactobacilli (community O), suggesting a close relationship between a specific CST (or a specific microbial population) and the possibility of developing the disease. This evidence concerns the gene BRCA1 and ovarian carcinoma.