Interferon has the following roles 1, antiviral effect: its antiviral activity is not to kill but to inhibit the virus, it is generally a broad-spectrum virus inhibitor, both RNA and DNA viruses have inhibitory effects. When the recovery period of viral infection is visible interferon, on the other hand with exogenous interferon can also relieve the infection. 2, inhibit cell proliferation interferon inhibits cell division activity has obvious selectivity, the activity of tumor cells is 500 to 1000 times greater than normal cells. The anti-tumor effect of interferon can be direct inhibition of tumor cell proliferation, or through the host organism’s immune defense mechanism to limit tumor growth. 3, induction of apoptosis: interferon can induce apoptosis of tumor cells, thereby killing tumor cells. 4, interferon on humoral immunity, cellular immunity have immunomodulatory effects, macrophages and NK cells also have a certain immune enhancing effect. It can be used in the following cases: 1. for a variety of malignant tumors, including hairy cell leukemia, chronic leukemia, non-Ho lymphoma, myeloma, bladder cancer, ovarian cancer, advanced metastatic kidney cancer and malignant endocrine tumors of the pancreas, melanoma and Kaposi sarcoma, etc. 2. in combination with other anti-tumor drugs. 3. as an adjuvant to radiotherapy, chemotherapy and surgery. 4. for the prevention and treatment of viral diseases. Interferon has the following advantages 1, on a variety of malignant tumors have significant efficacy Interferon for hairy cell leukemia efficiency of up to 80%; for chronic leukemia CR up to 69%, IF-α instrument therapy has become a standard treatment for chronic granulocytic leukemia; for non-Ho lymphoma efficiency of 65%; for myeloma is 15%-25%; for acute leukemia only moderate efficacy; for bladder cancer, ovarian cancer, advanced metastatic cancer, It is also effective against bladder cancer, ovarian cancer, advanced metastatic kidney cancer and malignant endocrine tumors of the pancreas; 15%-25% for melanoma IF-α; 35%-50% for Kaposi’s sarcoma occurring in AIDS. 2. Combination with other antitumor drugs can significantly improve the efficacy of treatment with DTIC for disseminated malignant melanoma; combination with ADM for ovarian cancer, pancreatic cancer, etc. shows synergistic effects, 5-Fluorouracil combined with interferon has the highest overall response rate of 63% in the treatment of advanced gastrointestinal cancer, especially colon cancer and esophageal cancer. 3.In clinical application, it is mostly used as an adjuvant to radiotherapy, chemotherapy and surgery. 4.It is effective in the prevention and treatment of viral diseases, such as acne vulgaris, condyloma and warts caused by papilloma virus. It is effective against acne vulgaris caused by papilloma virus, keratitis caused by herpes simplex virus, cold caused by rhinovirus and herpes zoster, etc. There is a certain effect on hepatitis B.