The purpose of this pre-experimental case study was to explore the efficacy and safety of the Eye Movement Desensitization and Reprocessing (EMDR) Group Traumatic Episode Protocol (G-TEP) in the psychological treatment of cancer survivors and its potential effects on posttraumatic stress, anxiety, and depressive symptoms. Participants (N = 35) were patients with various types of cancer, in different stages, initial or recurring, with diagnosis or oncology treatment received within the past year. Following an individual psycho-educational intake session, participants received two 90-minute EMDR G-TEP sessions, administered on consecutive days. They were randomly assigned to a treatment group or a delayed treatment group. Assessments were administered at pre, post, and follow-up using the Short PostTraumatic Stress Disorder Interview (SPRINT), State-Trait Anxiety Inventory (STAI), and Beck Depression Inventory (BDI-II). Repeated measures comparisons of PTSD symptoms, anxiety, and depression revealed significant differences between pretest and posttest, with most results maintained at follow-up. Pre-follow-up effect sizes showed medium effects. These promising results suggest the value in providing a lengthier course of treatment. They support the need for research with large sample, randomized clinical trials to examine the viability of providing EMDR G-TEP in the psychological treatment of cancer survivors. No serious adverse effects were reported and we conclude that the EMDR G-TEP may be effective and safe in the psychological treatment of an oncology population.