<p>(<b>A</b>) Balb/c nude mice bearing the established A549 tumors (∼50 mm<sup>3</sup>) were treated with HTPB via intraperitoneal (left panel) or oral administration (right panel) for three weeks (3 days/week). A known HDAC inhibitor, SAHA, was used for comparison in intraperitoneal experiments. The tumor volumes of mice were measured twice weekly. Points, mean; bars, ±SEM. Three mice per group for intraperitoneal injection and five mice per group for oral treatment were used in the xenograft experiment. (<b>B</b>) The tumor weights of mice were measured. P values were for comparisons with DMSO or vehicle control (* <i>P</i><0.05, ** <i>P</i><0.01). (<b>C</b>) HTPB treatments did not cause significant body weight loss of tested animals. (<b>D</b>) Hematological biochemistry tests including GOT, GPT, albumin and creatinine were examined and the results showed no significant differences between HTPB treatment and DMSO or solvent control.</p
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