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OBIECTIVE To observe the clinical efficacy and toxic effects of Mabthera(rituximab)in combination with the CHOP(R-CHOP)regimen for treating invasive B-cell non-Hodgkins lymphoma.METHODS A total of 45 patients with CD20 positive B-cell non-Hodgkins lymphoma were randomly divided into the R-CHOP(22 cases) and CHOP groups(23 cases for controls).They received the regimens of Mabthera in combination with CHOP or single CHOP therapy respectively.An appraisement of the curative effect could only be performed following 4 cycles of chemotherapy for the 45 patients.Follow-up was conducted to observe the conditions ot survival.RESULTS The rate of complete remission(CR)in the R-CHOP group was 68.2%,with a total effective rate of 81.8%,and in the CHOP group these rates were 34.8% and 78.3%respectively.There was a significant difference in comparing the CR rates between the two groups (P