U.S. stock futures about flat after giving up early-session gains

U.S. stock futures surrendered early-session gains late Thursday, and were last about flat following slight gains earlier in the day by the S&P 500 and Nasdaq Composite. After rising about 100 points, Dow Jones Industrial Average futures
YM00,
+0.02%
sank and as of 9:30 p.m. Eastern were about flat. S&P 500 futures
ES00,
+0.05%
and Nasdaq-100 futures
NQ00,
+0.12%
behaved similarly. The dip occurred after reports late Thursday that a high-level meeting between U.S. and Chinese diplomats was unproductive. Earlier, the Dow
DJIA,
-0.15%
closed slightly lower, off 39.51 points, or 0.2%, at 26,080.10, while the S&P 500 index
SPX,
+0.05%
gained 1.85 points, or less than 0.1%, to close at 3,115.34, and the Nasdaq
COMP,
+0.32%
rose 32.52 points, or 0.3%, to 9,943.05.