Extending gains for the fifth straight session, the Sensex at the Bombay Stock Exchange rose by 46 points in early trade today. The 30-share index had gained over 805 points in the previous four sessions.The Nifty at the National Stock Exchange rose by 14 points to 5,960.In Asia, Hong Kong's Hang Seng index rose by 0.17 per cent, while Japan's Nikkei gained 0.92 per cent. The US Dow Jones Industrial Average ended 0.47 per cent higher in previous session on Friday.