肿瘤学家面临的主要难题是无法阻止一些常见肿瘤的复发,尽管这些肿瘤最初对化疗很敏感。出现抗药是引起小细胞肺癌、乳腺癌、卵巢癌、急性白血病等其它癌症病人死亡的主要原因。克服抗药的方法有交替联合用药.大剂量化疗、区域性化疗等,但至今效果欠佳。 The main problem facing oncologists is that they cannot prevent the recurrence of some common tumors, although these tumors are initially sensitive to chemotherapy. The emergence of drug resistance is the main cause of the death of patients with small cell lung cancer, breast cancer, ovarian cancer, acute leukemia and other cancers. The methods of overcoming drug resistance include alternate combination therapy, high-dose chemotherapy, regional chemotherapy, etc., but the effect has so far been poor.