Study to Investigate Efficacy of a Novel Probiotic on the Bacteriome and Mycobiome of Breast Cancer

This study will investigate the efficacy of the investigational product (a novel probiotic) on altering the microbiome (bacteriomeand mycobiome) and polymicrobial biofilms in the gut of 50 women with breast cancer given the novel probiotic, compared to 50 women with breast cancer given a placebo. The objectives of this study are to: 1. Determine the efficacy profile of the novel probiotic 2. Analyze bacteriome and mycobiome profiles as well as polymicrobial biofilm composition from breast tissue and stool before and after consumption of the probiotic. 3. Compare quality of life (QoL) of those receiving novel probiotic compared to placebo.