Chicago Fire actress Robyn Coffin has been diagnosed with breast cancer and is preparing for a partial mastectomy on December 3CelebrityNov 14 at 6:03 PM – Nov 14 at 8:20 PM3 outletsDaily MailChicago Fire star Robyn Coffin announces breast cancer diagnosis as castmates rally behind actress ahead of partial mastectomy seen Nov 14 at 8:20 PMThe OregonianNBC actress reveals breast cancer diagnosis, starts GoFundMe Nov 14 at 6:03 PMTheWrap‘Chicago Fire’ Actress Robyn Coffin Shares Breast Cancer Diagnosis seen Nov 14 at 7:53 PM