Research is exploring the connection between gut microbiota and cancer, including how it affects the immune response and immunotherapy. Studies suggest that gut microbiota can influence cancer development and treatment resistance, and that certain molecules derived from gut bacteria may enhance cancer treatment responses. The relationship between gut microbiota and various types of cancer, including colorectal, lung, and breast cancer, is being investigated, with some findings indicating that gut microbiota can impact tumor growth and immunotherapy effectiveness.