Hogan, 59, was sworn into office in January after winning an upset victory over then-Lt. Gov. Anthony G. Brown (D).
He said he would soon begin aggressive chemotherapy treatments, and would rely on Lt. Gov. Boyd Rutherford (R) to fill in for him on state business as needed.
He described the cancer as a lymphoma, and said it had spread through his abdomen and was “pressing up against my spinal column.”