Tokyo stocks opened slightly lower Wednesday as the market cautiously awaited the release of earnings from Nvidia Corp., a U.S. chip giant that has been a significant driver of the artificial intelligence rally on Wall Street. In the first 15 minutes of trading, the 225-issue Nikkei Stock Average fell 70.33 points, or 0.18 percent, from Tuesday to 38,218.29. The broader Topix index was down 3.84 points, or 0.14 percent, at 2,676.96. On the top-tier Prime Market, decliners were led by pulp and paper, mining, and oil and coal product issues. At 9 a.m., the dollar fetched 143.95-97 yen compared w…