NEW YORK — Apple Inc. founder Steve Jobs, a survivor of pancreatic cancer whose gaunt appearance in the past year has alarmed the Mac and iPod lovers who look to him as an oracle, said Monday he has an easily treated hormone imbalance and will remain in charge of the company.
The news sent Apple stock up more than 4 percent on a down day for much of the market. But Jobs did not say whether the problem was related to the cancer, and some analysts said the health watch may not be over.
The chief executive’s health is an important issue for any company, but especially for Apple, where Jobs has presided over a decade of huge success. His mix of secrecy and high-design principles, seen in the rollouts of new Mac computers, the iPod music player and the iPhone, has become a trademark.
In a public letter, Jobs, 53, said his thinness had been a mystery even to him and his doctors until a few weeks ago, when “sophisticated blood tests” confirmed that he has “a hormone imbalance that has been ‘robbing’ me of the proteins my body needs to be healthy.”
“The remedy for this nutritional problem is relatively simple and straightforward, and I’ve already begun treatment,” he wrote. “Just like I didn’t lose this much weight and body mass in a week or a month, my doctors expect it will take me until late this spring to regain it.”
Jobs, who co-founded Apple with Steve Wozniak in 1976 at the dawn of the personal computer revolution, left in 1985 and returned as chief executive in 1997, slashing unprofitable product lines and helping rescue the company from financial ruin.
Jobs announced in 2004 that he had undergone successful surgery to treat a very rare form of pancreatic cancer — an islet cell neuroendocrine tumor. The cancer is easily cured if diagnosed early. Jobs did not have a deadlier and more common form of pancreatic cancer called adenocarcinoma.
Worries about Jobs intensified after Apple said in December that he would not make his annual keynote address today at the Macworld conference in San Francisco. It was at Macworld in 2007 that Jobs introduced the iPhone.
Apple said Jobs would not take the stage because this year will mark the company’s last appearance at the show, which is run by a separate company. Phil Schiller, an Apple marketing executive, will give the company’s presentation instead.
Apple stock rose $3.83, 4.2 percent, to close at $94.58.
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