The longtime KNBR host shared the news Friday, saying he is stepping away from broadcasting to focus on treatment. He did not disclose the type of cancer.

Greg Papa is the radio voice of the San Francisco 49ers on KNBR. He's also covered the Giants and Athletics, the Oakland Raiders and Golden State Warriors for decades.

The 49ers posted a statement on social media shortly after the announcement on KNBR: “The 49ers family extends our unwavering love and support to Greg Papa and his family following his recent cancer diagnosis. We wish him a speedy recovery and look forward to welcoming him back to the radio booth as the ‘voice of the 49ers’ whenever he is ready.”