The colorectal cancer(CRC)is one of the most common malignant tumors of digestive system,and has a complex process of development and progression.Its development is a complex and multistep process so the occurrence of CRC may influence organism immune and cause change of immunity.There are lots of researches demonstrating the immune system's reaction during the occurrence or development of the malignancy.Peripheral blood mononuclear cell(PBMC)is an ideal sample to study the immune functions,which is main pa...