癌症到了晚期，往往难以治愈，尤其是发生了广泛转移，病人难免死亡。那么癌症是如何致人于死地呢？分析一下主要是下列直接因素导致的。（１）合并感染：癌症病人免疫能力低下，因此容易发生感染。尤其病人经过化、放疗后，骨髓造血机能受到抑制，白细胞显著减少，更容易发生 Late cancer is often difficult to cure. In particular, there has been a widespread metastasis, and patients will inevitably die. So how does cancer cause death? Analysis is mainly caused by the following direct factors. (1) Co-infection: cancer patients have low immunity and are prone to infection. In particular, after the patient has undergone chemotherapy and radiotherapy, the hematopoietic function of the bone marrow is inhibited, and the white blood cells are significantly reduced and are more likely to occur.