An aspirin a day keeps metastatic cancer away, if so, what is the mechanism?: Probiotic-based chemotherapy targeting cancer stem cells and immune-inhibitory receptors in advanced metastatic cancers: A pharmaceutical mixture encompassing Aspirin, a nonsteroidal anti-inflammatory drug, and probiotic Lactobacillus rhamnosus increases the expression of tumor suppressor genes, such as  E-cadherin, PDCD4, BIRC5,  p53, and TA-p73/p63, inhibits immune-inhibitory receptors/molecules, targets ovarian cancer stem cells, confers protection against chemoresistance and prolongs survival, via up-regulation of its target gene, 18/April/2019, 10.41 pm