Probiotics are now being looked at as a possible addition to cancer treatments in both study and clinical settings. This study tries to give an overview of probiotic research as it relates to cancer, with a focus on how it might help avoid cancer, treat it, and improve the health of cancer patients. We look at developmental studies that use cell culture and animal models to look at how well probiotics work in cancer. We focus on how probiotics change the immune system, inflammation, and gut bacteria. The results of clinical studies that looked at probiotics as an add-on therapy for cancer patients are looked at to see how they affected the treatment success, side effects, and quality of life of the patients. We look at the possible benefits of probiotics for certain types of cancer, such as colorectal cancer, breast cancer, and stomach tumors. We also find the best probiotic strains for each type of cancer. We also look at the synergistic benefits of combining probiotics with standard cancer treatments like chemotherapy, radiation therapy, and immunotherapy to improve the effectiveness of treatment and lower side effects. Lastly, we talk about the present problems and future directions of probiotic research for cancer. We focus on personalized methods, ideal doses and treatment plans, finding signs of treatment success, and making probiotic-based therapies. By learning more about how probiotics could be used to treat cancer, we can create personalized, successful, and well-tolerated probiotic treatments to improve cancer outcomes.