US STOCKS-Wall St extends losses as China data unnerves investors
* Commodities fall on China demand concerns
* U.S. consumer spending rises more than expected in Aug
* Healthcare stocks continue their fall
* Indexes down: Dow 1.63 pct, S&P 2.24 pct, Nasdaq 2.81 pct (Adds details, Updates prices)
By Abhiram Nandakumar and Sweta Singh
Sept 28 (Reuters) - U.S. stocks extended their losses in afternoon trading on Monday and were set for their worst third quarter in four years as investors worried about the health of China's economy and its potential impact on the timing of a U.S. interest rate increase.
The S&P 500 and the Nasdaq composite were down more than 2 percent, while the Dow Jones industrial average fell about 1.5 percent. All 10 S&P sectors down.
Healthcare stocks continued the decline that started last week after Democratic presidential candidate Hillary Clinton criticized drug pricing.
The Nasdaq biotechnology index fell 3.8 percent as investors continued to flee the sector, following its worst week in seven years. Among the S&P sectors, the health care index was the top decliner. Continuación...