 An increasing number of gastrointestinal cancer (GI) patients suffer from  side effects of cancer treatment that can affect their  mood states and quality of life. Despite its demonstrated effectiveness in female cancer patients, Supportive Expressive Group Therapy (SEGT) has not been tested in male cancer patients. The current study sought to examine the longitudinal effects of a professionally-led, men-only SEGT on mood states, coping, and quality of life (QoL) in male GI cancer patients.