Probiotics for Abemaciclib-Induced Abdominal Discomfort.

This study investigates whether a specific "Synbiotic" supplement (containing probiotics, prebiotics, and postbiotics) can help reduce abdominal discomfort, particularly diarrhea, in breast cancer patients taking the targeted therapy drug, Abemaciclib. Abemaciclib is highly effective in preventing breast cancer recurrence but frequently causes gastrointestinal side effects. While standard anti-diarrhea medications (Loperamide) are used, many patients still experience discomfort. Preliminary observations suggest that certain probiotics and polyphenols may help restore intestinal balance and reduce these symptoms. Participants will be randomly assigned to two groups. During the 4-month study period, everyone will receive both the synbiotic supplement and a placebo at different stages (a crossover design). All participants will continue their standard cancer treatment and have access to standard anti-diarrhea medication as needed. The study will also analyze blood samples to see if the supplement improves metabolic health.