In 2003, Jobs discovered that he had a neuroendocrine tumor, a rare but operable form of pancreatic cancer. Instead of immediately opting for surgery, Jobs chose to alter his pescovegetarian diet while weighing Eastern treatment options. For nine months, Jobs postponed surgery, making Apple's board of directors nervous. Executives feared that shareholders would pull their stock if word got out that their CEO was ill. But in the end, Jobs' confidentiality took precedence over shareholder disclosure. In 2004, he had a successful surgery to remove the pancreatic tumor. True to form, in subsequent years Jobs disclosed little about his health.