Dr. Mark Peterson is a well known ob-gyn surgeon in Mankato.  He is a graduate of the University of Minnesota School of Medicine and Franklin Square Hospital Residency Program.  In his practice, he has cared for many patients with cancer.  So it seemed a cruel twist of fate to have the roles reversed and to become the patient with cancer.  Dr. Peterson has been doing battling his cancer for years now and has had surgery, immunotherapy, targeted therapy, surgery again and targeted therapy again.  He is still battling hard against his cancer and giving his all.