Modest gains for U.S. shares disappeared Thursday afternoon in what will be the fifth light volume session in a row, with the Dow Industrials being the only index to hold on to gains at the closing. The Dow Industrials closed at 10001.99, up 12.32 or 0.12%, but down from its day's high of 10052.29. The S&P 500 was down 2.03 at 1116.47, and the Nasdaq Composite ended at 1843.37, 12.04 points or 0.18% below the previous close. A second straight decline in weekly jobless claims raised hopes that the rate of employment losses will begin to slow boosting shares at the opening. But dealers said the rally proved weak, opening the way for profit-taking in afternoon trade.