Abstract
Selenium, an essential trace element possessing anti-carcinogenic properties, can induce apoptosis in cancer cells. Our goal was to investigate the enhanced anti-tumor effects of photodynamic therapy (PDT) plus selenium in TC-1 tumor cells implanted into mice. The MTT assay and tumor growth inhibition study were evaluated at various time intervals after the PDT plus a various dose of selenium. Following Radachlorin injections after 3 hr, the mice were then administrated selenium (2ug/kg b.w.) and then, tumors were treated with external light treatment (300 J/cm<sup>2</sup>). The selenium was administered daily for 20 days. PDT or selenium was found to be more compared to control groups. Moreover, the PDT combined with selenium demonstrated a significant suppression of tumor growth <i>in vitro</i> and <i>in vivo</i>. The tumor growth by the PDT combined with selenium was significantly reduced. These data suggest that selenium plus PDT can induce a significant tumor suppression response compared with PDT alone. Also, it can be an effective approach to induce anti-cancer therapy strategy.
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