Foundation and Clinical About the Expression of PD-1 in Peripheral Blood T Lymphocytes

From the perspective of immunology, it is intended to explore whether the expression of PD-1 in peripheral blood T lymphocytes can be used as a reference index for selecting immune "+" therapy in patients with advanced HCC, and to clarify the relationship between the expression level of peripheral blood T lymphocytes and the survival data of patients receiving immune "+" therapy. And explore whether there is consistency between the expression level of PD-L1 and that of PD-L1 on patients. At the same time, to explore whether there is a correlation between the distribution of T cell subsets and the efficacy of immunotherapy, so as to provide a new theoretical basis for the clinical screening of the target population of immune "+" therapy and a new clinical screening index for the prognosis assessment of patients.