Mercyhealth’s Doctor Kevin Kozak, Radiation Oncology Chief at Mercyhealth Cancer Center – Janesville returns. According to a news release, Kozak is dedicated to educating and treating patients in the most comprehensive way possible. His special interests include lung cancer, breast cancer, gastrointestinal cancer, sarcomas, and using technology to improve quality of life. Those wishing to make an appointment with Doctor Kozak can call Mercyhealth Cancer Center-Janesville.