Objective: To study on Fuzheng Baozhen Decoction (FZBZD) enhancing effect of radio- and chemotherapy for malignant tumors. Methods: One hundred and Seventeen cases of malignant tumors treated with chemotherapy or/and radiotherapy. Among them 55 cases were treated together with FZBZD (group A)

30 cases together with Zhenqi Fuzheng Granules (group B)

and the other 32 cases treated with radio- and chemotherapy alone (group C). Mechanism of FZBZD enhancing effect of chemotherapy in treating transplanted human lung adenocarcinoma (SPC-A-1) and sarcoma (S180) bearing mice was conducted experimentally. Results: Effective rates (CR+PR) of group A

B and C were 63.6%

43.3% and 37.5% respectively

that of group A being the best (P < 0.05). The survival quality of life was improved the most in group A (P < 0.05). The picture of peripheral blood (WBC

Hb

PLT count) of group A after treatment was better than that of the other two groups (P < 0.05). And CD3

CD4

NK activity

interleukin-2 levels were also improved more significantly in group A (P < 0.01) than those in the other two. Animal experiment showed that FZBZD could improve the effect of chemotherapy in inhibiting tumor growth (P < 0.01)

raising cAMP/cGMP ratio (P < 0. 01) by increasing the cAMP level in cancer tissue

and enhancing cells ofG0/G1 phase and reducing cells of S phase. Conclusion: FZBZD inhibited tumor growth and enhanced the effect of radio- and chemotherapy by improving immune and hematopoietic function

cAMP/cGMP ratio and halting tumor cells in G0/G1 phase.