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Microsoft co-founder and investor Paul Allen announced Monday evening that he is battling non-Hodgkin’s lymphoma again, after being treated for the cancer in 2009. “My team of doctors has begun treatment of the disease and I plan on fighting this aggressively,” Allen wrote in a statement. “A lot has happened in medicine since I overcame this disease in 2009. My doctors are optimistic that I will see good results from the latest therapies, as am I.” He stated that he will continue to stay involved in his ventures, including his company Vulcan Inc., his research institutes, and his ownership of the NFL team Seattle Seahawks and NBA team Portland Trail Blazers. “I am very grateful for the support I’ve received from my family and friends. And I’ve appreciated the support of everyone on the teams and in the broader community in the past, and count on that support now as I fight this challenge,” he said.