Apple (Nasdaq: AAPL) boss Steve Jobs sought cancer treatment in Switzerland in 2009, according to a report in Fortune magazine.

Jobs reportedly went to a facility at the University of Basel to seek treatment for neuroendocrine cancer.

In 2004, Jobs has taken a medical leave to undergo surgery for pancreatic surgery. Jobs took another medical leave in 2009 and was out of commission for about six months.

Fortune reports that while in Basel Jobs underwent an “unusual” radiological treatment for neuroendocrine cancer, according to Jerry York, a former Apple director who died in March 2010. The treatment is unavailable in the U.S.

The report also cited a cancer expert at the University of Iowa who said that survival rates are improving due to better treatment.

Jobs has now taken three medical leaves in the past seven years.