Female nude mice (5–6 weeks) were purchased from Beijing Vital River Laboratory Animal Technology Co., Ltd. (Beijing, China). A total of 5 × 106 HCT116 and Hep3B cells were subcutaneously inoculated to nude mice. When the tumors reached a mean group size of about 100 mm3, mice were randomly divided into four groups receiving sodium carboxymethyl cellulose (CMCNa) as vehicle, ARS (50 mg/kg), SAHA (50 mg/kg), and combination (50 mg/kg ARS plus 50 mg/kg SAHA) daily by intragastric administration for 3 weeks. Tumor volume was calculated as (length × width2)/2.
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