The significance of PDL1-122c3 test is to assess whether immunotherapy can be applied, and the degree of benefit of treatment can be predicted. Malignant tumors are relatively common diseases nowadays, and in recent years, after treatment through chemotherapy, radiotherapy, surgery, targeting and other treatments, a part of the patients can achieve better results, or even can be cured, but there are still a part of the patients who will have recurrence and metastasis, or even found to be in advanced stage. However, for advanced patients, PDL1-122c3 test can be used to be able to assess whether it is sensitive to immunotherapy, further improve the treatment effect of patients, prolong the survival period and improve the quality of life, which is also a more popular treatment mode at present.