肿瘤的发生发展与机体的免疫机能有着密切的关系。伴随肿瘤发生和发展的过程,宿主体内往往产生一些免疫抑制物质。这些物质既能抑制T、B淋巴细胞的功能,又能抑制T与B细胞的协同作用。它们在患者血清中的浓度往往随着癌肿的切除或病情的缓解而降低,随着肿瘤的复发或病情的恶化再度增高。 Tumor occurrence and development and the body’s immune function has a close relationship. With the process of tumorigenesis and development, the host often produces some immunosuppressive substances. These substances can both inhibit T, B lymphocyte function, but also inhibit the synergy of T and B cells. Their concentration in patient serum often decreases with the excision of the cancer or the remission of the disease and increases again with the recurrence of the tumor or the worsening of the disease.