The BSE benchmark Sensex which rose by 121 points in opening trade lost its early gain and was trading up by 25 points at 17,733, a short while ago.The 30-share index had gained nearly 844 points in the last five sessions. The wide-based Nifty of the National Stock Exchange was trading up 10 points at 5370.In Asia, Hong Kong's Hang Seng Index rose by 0.13 per cent, while Japan's Nikkei Index down by 0.43 per cent in early trade today.