Trilaciclib Prevents Myelosuppression With Chemoradiotherapy

Inclusion Criteria: 1. The histopathology is limited-stage small cell lung cancer. 2. ECOG score 0-2. 3. Good organ function (no blood transfusions, no hematopoietic stimulating factors, no transfusions of albumin or blood products within 14 days prior to the examination). 4. It is suitable for patients treated with Trilaciclib combined with etoposide plus cisplatin or carboplatin. 5. Understand and can sign informed consent Exclusion Criteria: 1. Brain metastases with clinical symptoms require local radiotherapy or hormone therapy. 2. Active infections require systemic treatment. 3. Subjects with active, known or suspected autoimmune disease or history of autoimmune disease. 4. Combined with other tumors. 5. The current or previous presence of a clinically significant and medically unstable condition, which in the investigator's professional judgment may compromise subject safety, interfere with study evaluation or endpoint assessment, or otherwise impact the reliability of study results.