Paul Allen says non-Hodgkin's lymphoma has returned

SEATTLE (AP) — Billionaire Seattle Seahawks owner and Microsoft co-founder Paul Allen says cancer he was treated for in 2009 has returned.

Allen made the announcement Monday on Twitter, saying he recently learned of the non-Hodgkin's lymphoma and that he plans to fight it aggressively.

He says a lot has happened in medicine since he overcame the disease nearly a decade ago and that he and his doctors are optimistic that he will see good results from the latest therapies.

Allen says he will continue to stay involved with Vulcan, the Allen Institutes, the Seahawks and Portland Trail Blazers and that he has confidence in leadership teams to manage operations while he's undergoing treatment.