* MSCI main world index up 1 percent at 341.57
* JP Morgan, falling oil prices stabilise investor mood
* Focus on more results from key U.S. banks, corporates
* Dollar steady after falling on ECB comments, SWF report
(Updates with moves after JP Morgan results)
By Natsuko Waki
LONDON, July 17 (Reuters) - World stocks extended gains on Thursday from a recent 21-month low after JP Morgan became the latest bank to report forecast-topping earnings results and oil prices retreated further.
JP Morgan <JPM.N>, the third-largest U.S. bank, reported second quarter net income of $0.54 a share, against Reuters estimates' consensus of $0.44.
This followed Wednesday's unexpectedly strong results at Wells Fargo <WFC.N>, the fifth largest U.S. bank and a big mortgage lender, which dragged financial shares up from their record lows and helped stabilise the dollar.
Investors are now looking to a series of U.S. corporate quarterly earnings results later from firms including Merrill Lynch <MER.N>, IBM <IBM.N>, Microsoft <MSFT.O> and Google <GOOG.O>.
These results will set the tone for equities and risky assets which have been sold off in recent sessions on concerns about the financial sector -- which many analysts say would take a series of extremely strong results to wipe out.
"Even if we get a positive surprise here and there, that doesn't mean the financial crisis is over. We might get a technical rebound in the short term, but from a macro perspective, it's a different story," said Yann Lepape, chief global macro strategist at Oddo Securities in Paris.
"Apart from the financials, corporate results for the second quarter might not be as bad as expected, but overall we see a further deterioration of the economic conditions, and corporate results could really suffer in the third quarter."
The FTSEurofirst 300 index <
> extended gains after JP Morgan results to stand up 2.1 percent on the day.MSCI main world equity index <.MIWD00000PUS> gained 1 percent after hitting the 21-month low earlier this week.
U.S. stock futures were up around 0.5 percent <SPc1>, indicating a firmer open on Wall Street.
On Wednesday, the KBW Bank index <.BKX> of large banking companies rose 17.3 percent on Wall Street, its biggest gain in at least 15 years.
ECB AND SOVEREIGNS
The dollar was down around 0.2 percent at $1.5858 <EUR=> per euro, while it steadied against a basket of currencies <.DXY>.
The euro advanced against the dollar after ECB Governing Council member Nout Wellink said a slower economy would not reduce inflation, adding that like in the 1970s if no action was taken, then the economy would experience stagflation.
"Wellink is a reminder... that if you let inflation get out of hand it's pretty costly to bring it back under control," said Chris Turner, head of FX strategy at ING.
Also weighing on the dollar earlier, the Financial Times reported some of the world's largest sovereign wealth funds are seeking to scale back their exposure to the U.S. dollar in a sign of global concern about the currency.
However, dollar weakness poses a problem for many oil rich nations in the Gulf as a falling U.S. currency fans inflation which these economies have limited means to control because their currencies are pegged to the greenback.
Emerging sovereign spreads <11EMJ> tightened 4 basis points while emerging stocks <.MSCIEF> rose 1.7 percent after hitting a 2008 low.
The September Bund future <FGBLU8> fell 50 ticks.
U.S. light crude <CLc1> fell 0.8 percent to $133.54 a barrel, after falling nearly $15 from last week's record high above $147 in the past sessions.
Gold <XAU=> fell to $957.00 an ounce. (Additional reporting by Blaise Robinson and Toni Vorobyova; Editing by Ron Askew)