US stocks open mixed at end of a wild week

Major U.S. stock indexes got off to an uneven start in early trading Friday, a day after stocks clocked their worst day of the year. Exact Sciences shares soared after the company said its new colon cancer test will be covered by Medicare. Oil stocks fell again as the price of crude continued to decline.<br /> <br /> KEEPING SCORE: The Dow Jones industrial average gained 18 points, or 0.1 percent, to 16,675 as of 10:12 a.m. Eastern time. The Standard & Poor's 500 index fell four points, or 0.2 percent, to 1,923. The Nasdaq composite lost 40 points, or 0.9 percent, to 4,337. Energy and technology stocks fell the most of the 10 sectors in the S&P 500.<br /> <br /> MEDICARE BOOST: Exact Sciences surged 37.3 percent after the company said its new colon cancer test will be covered by Medicare. Shares in the medical diagnostic test maker added $6.70 to $24.83.<br /> <br /> SHORTCIRCUIT: Electric car maker Tesla fell 7.2 percent in early trading as traders seemed disappointed by the company's announcement of a new all-wheel drive car late Thursday. The stock lost $18.33 to $238.74.<br /> <br /> ROLLER COASTER WEEK: Investors were wading back into the market after a whiplash-inducing week. The Dow Jones industrial average plunged 334 points Thursday, a day after the market recorded its best day of the year. Volatility has returned to global markets amid concerns that global economic growth is slowing.<br /> <br /> SLOWDOWN CONCERNS: Germany, Europe's biggest economy, reported its biggest monthly drop in exports in five years, stoking worries that the continent is heading for recession. The president of the European Central Bank, Mario Draghi, gave no indication of any further monetary stimulus beyond what was announced this summer, suggesting in a speech in Washington that governments need to do more on the fiscal side.<br /> <br /> OVERSEAS MARKETS: European markets were mostly lower. Britain's FTSE-100 lost 0.8 percent, while Germany's DAX fell 1.5 percent. France's CAC-40 declined 0.7 percent. In Asia, Tokyo's Nikkei 225 index slumped 1.3 percent and Hong Kong's Hang Seng lost 1.6 percent. China's Shanghai Composite Index shed 0.6 percent. Seoul fell 1.3 percent and Sydney and Singapore also declined.<br /> <br /> BONDS AND COMMODITIES: The yield on the 10-year Treasury note held steady at 2.31 percent. U.S. crude declined 81 cents to $84.96 a barrel.

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