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1·Objective to study antitumor effect of calcium folinate (CF) and 5 fluorocytosine (5 FU) on rectal carcinoma cells transfected with cytosine deaminase (CD) gene.

目的：探讨亚叶酸钙(CF)联合5氟胞嘧啶(5 FU)对转染胞嘧啶脱氨酶(CD)基因的直肠癌细胞的杀伤作用。