US STOCKS-Wall St slides amid selloff in commodity prices
* Copper prices hit 3-week low, oil down about 2 pct
* All 30 Dow components and 10 S&P sectors down
* Volatility index jumps
* Goldman falls after CEO discloses he has cancer
* Indexes down: Dow 1.1 pct, S&P 1.2 pct, Nasdaq 1.5 pct (Updates to late afternoon, changes byline)
By Caroline Valetkevitch
Sept 22 (Reuters) - U.S. stocks dropped late Tuesday afternoon, dragged down by investor uncertainty over when the Federal Reserve will raise interest rates and as a selloff in commodities pushed materials shares lower.
S&P materials, down 1.8 percent, led the decline, but the selloff was broad-based. All 30 Dow components were down, along with all 10 major S&P sectors.
Copper prices hit a three-week low. U.S. crude oil also settled lower. Continuación...