Thymidine kinase 1 is a cytoproliferative kinase that provides the precursor dTMP (deoxythymidine nucleotide) for cellular DNA (deoxyribonucleic acid) synthesis in vivo. Its level and activity are elevated in response to cancerous changes in the body. It can be detected by drawing blood from a vein. Thymidine kinase 1 antibody test serum is suitable for population census, especially for monitoring tumor patients under treatment (including surgery, radiotherapy and chemotherapy) and evaluating treatment effect, and early diagnosis of whether there is a risk of recurrence and metastasis during treatment, which provides a basis for clinical treatment. It can evaluate the effect of radiotherapy for lung cancer, breast cancer, gastrointestinal tract tumors, lymphoma and other malignant tumors, and provide information reference for the development and adjustment of treatment plans; it can evaluate the proliferation of tumor cells before and after surgery of tumor patients, and find out the recurrence and metastasis earlier than the imaging examination, and evaluate the effect of surgery. Thymidine kinase 1 is detected by drawing blood from vein, and it is recommended to consult with doctor for the specific suitability and clinical significance of the test.