The goal of this clinical trial is to investigate the effectiveness of Acceptance and Commitment Therapy Based Intervention for Oncology Patients. The main questions it aims to answer are:
* Does the Acceptance and Commitment to Therapy-Based Intervention for Oncology Patients affect the level of psychological distress? * Does the Acceptance and Commitment to Therapy-Based Intervention for Oncology Patients affect the level of reintegration into normal life?
Researchers will compare Acceptance and Commitment Therapy-Based Intervention for Oncology Patients (ACT) to Psychoeducation for Oncology Patients and routine care (with no specific intervention) to see if Acceptance and Commitment Therapy-Based Intervention for Oncology Patients is effective in psychological distress and reintegration into normal living.
18 years of age or older,
Being able to read and write,
Receiving oncologic treatment,
Being diagnosed with breast cancer,
Having serious psychiatric or cognitive impairments that limit adherence to group sessions,
Having a physical disability that may make it difficult to participate in group sessions,
Failure to attend sessions regularly and absenteeism,
Currently being in a psychoeducation/psychotherapy group