Microsoft Co Founder - Allen treated for Cancer

SEATTLE - Microsoft Corp. co-founder and billionaire investor Paul Allen has been diagnosed with non-Hodgkin's lymphoma and is undergoing chemotherapy.

In a memo sent to employees, Jody Allen, Paul Allen's sister and the CEO of his investment firm Vulcan Inc., said the 56-year-old received the diagnosis early this month. According to the memo, Paul Allen has diffuse large B-cell lymphoma, a relatively common form of lymphoma.

Allen battled another form of immune system cancer, Hodgkin's lymphoma, more than 20 years ago and survived. The CEO wrote that Allen "is optimistic he can beat this, too."