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Inhibition of histone deacetylases (HDACs) is emerging as a new strategy in cancer therapy. In the present work a novel pyrimido-quinoline benzene sulfonamide (PIQSA compound) was designed and synthesized postulating its ability to inhibit HDAC enzyme in cancer cells. This study was designed to examine the in vitro anti-tumor efficacy of PIQSA against Ehrlich Ascite carcinoma cells (EAC) and three of the human cancer cell lines (H460), brain (U251) and liver (HepG2). The results of Cytotoxic assays showed that PIQSA exhibited in vitro antitumor activity in a dose dependant manner. The tumor growth delay studies indicating that PIQSA resulted in significant regression in tumor growth, which was more pronounced when PIQSA treatment accompanied with radiation exposure. Also, the efficacy of PIQSA to influence radiation response in Ehrlich solid carcinoma (ESC) tumors was estimated. The results suggest that PIQSA exhibited antitumor activities and strong radioenhancing properties associated with inhibition of HDAC activity, DNA fragmentation followed by apoptotic cell death, preferential cell loss of cells particularly in G1/G0 phase through an apoptotic pathway

Evaluation of the Antitumor and Radiosynthetizing Activity of a Novel Quinoline Sulfonamide Derivative (PIQSA) as a Histone Deacetylase Inhibitor