Positive CD79a indicates that the cells are of B-cell origin, which is clinically important in the diagnosis of B-cell lymphoma. CD79a is an immunophenotype of cells, often B lymphocytes show CD79a positive, so in the pathologic diagnosis of lymphoma, need to carry out the examination of this index, can guide the diagnosis and treatment. Lymphoma is a common malignant tumor, and lymphoma cells are divided into T cells and B cells, and different types of cells have different treatments and prognosis. The examination of CD79a helps to further categorize them. At present, this index is only used for the classification of lymphoma, and there is no relevant targeted drug application.