FN1 and breast cancer: Comparatively, 2 of the included studies [41, 43], both of which stated their patient follow-up periods as being more than 10 years, implied that the influence of FN species microbial levels within oral biofilms statistically possessed an insignificant effect on female-specific BC pathogenesis (RR = 1.41, 95% CI = 0.88–1.87) (Table 2).