What killed Steve Jobs?

What killed Apple's visionary founder and CEO Steve Jobs? Neither his company nor his family have disclosed the cause of death, but medical experts not involved in his care suspect his cancer had returned.

Steve Jobs had battled a rare type of slow-growing pancreatic cancer for more than seven years. Medical experts say his need for a liver transplant two years ago signaled that his cancer had likely returned or spread. They said his death could have been from cancer, his new liver not working, or complications from immunosupressive drugs that prevent organ rejection.

Jobs declared he was cured in 2004, following surgery for a so-called islet cell neuroendocrine tumor. That rare form of pancreatic cancer is considered more treatable than the form of the disease that killed actor Patrick Swayze in 2009.

"Neuroendocrine tumors are uncommon, with only a few thousand cases a year," Dr. Craig Devoe, a pancreatic cancer expert at North Shore-LIJ Health System in New Hyde Park, N.Y, told HealthDay. Devoe speculated that fewer than 1,000 of these cases strike the pancreas. Overall, there are about 43,000 cases of pancreatic cancer each year, which kills nearly 38,000 people.

Treatment options vary but include chemotherapy, hormone therapy, and surgery to remove the tumor or surrounding tissue.

A liver transplant can cure Jobs' type of cancer, but "if it were to come back, it's usually in one to two years," said Dr. Michael Pishvaian, a gastrointestinal cancer specialist at Georgetown University.

Intensely private, Jobs never revealed whether the cancer had spread to his lymph nodes or liver, or the extent of his surgery. Some doctors speculated he had a Whipple procedure, in which a portion of the pancreas and small intestine, the gallbladder, and in some cases part of the stomach are removed and the remaining organs are reattached to allow for digestion.

Steve Jobs is the Chairman and CEO of Apple Computers Inc. and arguably one of the world’s most successful businessmen today.

He founded Apple in the 1970s, got chased out by his own board of directors, but returned eventually as Apple’s CEO. Since then, he has revolutionized the IT industry with his creations like the MacBook, the iPod and the iPhone.

Since his return, he has brought Apple Computers Inc. from a fledging company to a global force to be reckoned with.

"It's a big operation" that can lead to digestive difficulties, said Dr. Steven Libutti, director of the Montefiore-Einstein Center for Cancer Care in the Bronx.

“Weight loss when it comes to advanced cancer is never a good thing,” said Dr. Jack Jacoub, a medical oncologist at MemorialCare Cancer Institute at Orange Coast Memorial Medical Center in Fountain Valley. Keeping body weight up and healthy while fighting the disease is key, he added. “We use 10% weight loss as being a negative prognosticator.”