2019 年底新冠病毒疾病 (COVID-19) 首次爆发后，在全球多个国家引发了多轮传播。癌症患者主要为老年人，肿瘤本身和抗肿瘤治疗引起的免疫抑制状态，伴随更多的基础疾病，以及更多的住院环境暴露导致 COVID-19 感染率更高。感染后严重病例比例高，死亡率高。因此，基于国内外研究和临床实践，中国临床肿瘤学会老年肿瘤预防与治疗专家委员会根据癌症患者的特征，包括流行病学、临床表现、鉴别诊断、严重病例的定义和危险因素、诊断和治疗建议、抗肿瘤治疗复原及疫苗接种建议，发起了一次讨论，为此类患者的临床诊断和治疗提供相应建议。

After the first outbreak of corona virus disease 2019 (COVID-19) at the end of 2019, it has caused multiple rounds of transmission in many countries around the world. Cancer patients are mainly elderly people, and the immunosuppression state caused by the tumor itself and anti-tumor treatment, more accompanying underlying diseases, and more hospital environmental exposure leading to a higher incidence of COVID-19 infection. The proportion of severe cases after infection is high, and the mortality is high. Therefore, based on the domestic and foreign research and clinical practice, the Expert Committee of Geriatric Cancer Prevention and Treatment of Chinese Society of Clinical Oncology launched a discussion based on the characteristics of cancer patients, including the epidemiology, clinical manifestations, differential diagnosis, definition and risk factors of severe cases, diagnosis and treatment recommendations, recovery of anti-tumor treatment and vaccination recommendations. To provide the corresponding suggestions for the clinical diagnosis and treatment of such patients.