Portland Trail Blazers owner Paul Allen is again battling cancer.

The Microsoft co-founder, who also owns the Seattle Seahawks, announced today that he has been diagnosed with non-Hodgkin's lymphoma, a disease he received treatment for nine years ago.

"A lot has happened in medicine since I overcame this disease in 2009," Allen wrote on his blog. "My doctors are optimistic that I will see good results from the latest therapies, as am I."

This is the third round of cancer treatment for Allen, 65. He was initially diagnosed with Hodgkin's disease in 1982, which led to his retirement from Microsoft.

In a statement, Allen said he will continue to be involved with the Blazers and Seahawks, as well as Vulcan Inc. and his various Allen Institutes, while undergoing treatment.

Read his full statement below:

I learned recently that the non-Hodgkin’s lymphoma that I was treated for in 2009 has returned. My team of doctors has begun treatment of the disease and I plan on fighting this aggressively. 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. I will continue to stay involved with Vulcan, the Allen Institutes, the Seahawks and Trail Blazers, as I have in the past. I have confidence in the leadership teams to manage their ongoing operations during my treatment. 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. Go Seahawks! Go Blazers!