To investigate the changes on the immunophenotypes and the clinical effects of treatment of the late cancer patients with infusion of human peripheral blood lymphocytes stimulated by anti-CD28 and anti-CD80 monoclonal antibodies in combination with radiotherapy and chemotherapy, 42 patients with late cancers were collected for study, among which 22 patients were treated with infusion of stimulated lymphocytes in combination with radiotherapy and chemotherapy. The immunological treatment procedure was given twice per week, and one course of treatment consisted of 8 times of giving infusion of lymphocytes. Another 20 patients were selected for control group, in which only radiotherapy and chemotherapy were given without lymphocyte infusions. Flow cytometry was used to examine the immunophenotypes and the clinical symptoms were observed before and after treatments. It was found that the numbers of the CD3~+, CD4~+ cells increased, while those of the CD8~+ cells decreased, with an increase of CD4/CD8 radios, but no significant difference existed in case of 22 patients treated with lymphocyte infusion as well as with radiotherapy and chemotherapy. Fifteen patients out of these 22 cases (68.18%), the immunophenotypes changed obviously with increased numbers of CD3~+, CD4~+ cells in comparison with those before treatment, and the number of CD95~+ cells was increased after treatment. The PS value in this group of patients decreased after treatment. In comparison with 20 cases in the control group, the immunophenotypes showed no differences before and after treatment. While the PS value decreased obviously. Seven out of the 22 cases (31.83%) treated with lymphocyte infusions as well as with radiotherapy and chemotherapy illustrated no major changes in their immunophenotypes, compared with the situation before treatment, but the PS value also decreased. In case of treatment with lymphocyte infusions in combination with radiotherapy and chemotherapy, the alteration of phenotypes was reversely correlated with the changes of clinical grades. Although there were 7 cases showing no major alterations of the immunological phenotypes, but their correlation was still evident. In the control group, neither alteration of immunophenotypes nor changes in clinical grades was found. It is concluded that immunotherapy in combi-nation with radiotherapy and chemotherapy can relieve the side effects induced by radiotherapy and chemotherapy and also enhance the therapeutic efforts. To investigate the changes on the immunophenotypes and the clinical effects of treatment of the late cancer patients with infusion of human peripheral blood lymphocytes stimulated by anti-CD28 and anti-CD80 monoclonal antibodies in combination with radiotherapy and chemotherapy, 42 patients with late cancers were for study, among which 22 patients were treated with infusion of stimulated lymphocytes in combination with radiotherapy and chemotherapy. The immunological treatment procedure was given twice per week, and one course of treatment consisting of 8 times of giving infusion of lymphocytes. Another 20 patients were selected for control group, in which only radiotherapy and chemotherapy were given without lymphocyte infusions. Flow cytometry was used to examine the immunophenotypes and the clinical symptoms were observed before and after treatments. It was found that the numbers of the CD3 ~ +, CD4 ~ + cells increased, while those of the CD8 ~ + cells decreased, with an increase of CD4 / CD8 radios, but no significant difference existed in case of 22 patients treated with lymphocyte infusion as well as with radiotherapy and chemotherapy. Fifteen patients out of 22 cases (68.18%), the immunophenotypes changed obviously with increased numbers of CD3 ~ +, CD4 ~ + cells in comparison with those before treatment, and the number of CD95 ~ + cells was increased after treatment. The PS value in this group of patients decreased after treatment. showed no differences before and after treatment. While the PS value decreased obviously. Seven out of the 22 cases (31.83%) treated with lymphocyte infusions as well as with radiotherapy and chemotherapy illustrated no major changes in their immunophenotypes, compared with the situation before treatment , but the PS value also decreased. In case of treatment with lymphocyte infusions in combination with radiotherapy and chemotherapy, the alteration of phenotypes the reversely correlated with the changes of clinical grades. there the were 7 cases showing no major alterations of the immunological phenotypes, but their correlation was still evident. In the control group, neither alteration of immunophenotypes nor changes in clinical grades was found. It is concluded that immunotherapy in combi-nation with radiotherapy and chemotherapy can relieve the side effects induced by radiotherapy and chemotherapy and also enhance the therapeutic efforts.