Effects of a Group Versus Individual Cognitive Training Program on Chemotherapy-induced Cognitive Impairment (Chemobrain) in Breast Cancer Patients Undergoing Active Treatment

Introduction: The significant improvement in breast cancer survival, largely attributable to biomedical and technological progress, makes it increasingly necessary to investigate the secondary effects linked to this pathology. Among these, cancer-related cognitive impairment (CRCI) stands out as one of the most frequent yet frequently overlooked complications.

Objective: To evaluate the impact of a structured cognitive training program on the management of CRCI in patients with breast cancer receiving active treatment.

Methodology: A randomized controlled clinical trial will be conducted with two arms: an Intervention Group (IG) and a Control Group (CG). The study will include patients with a recent diagnosis of breast cancer. Based on sample size calculations, 50 participants will be recruited-25 per group-to detect a minimum difference of 2.95 points on the MoCA (Montreal Cognitive Assessment), a tool commonly used to assess cognitive performance. All participants will receive an informational leaflet aligned with the latest WHO recommendations for preventing cognitive decline. In addition, the IG will complete an individualized cognitive training (CT) program focused on everyday cognitive skills (EC). The program will provide a dossier with 80 training sessions, structured into four phases (P1-P4) of 20 activities each, to be implemented monthly. Baseline assessments and a follow-up four months after the intervention will be carried out in both groups. Variables collected will include sociodemographic and clinical data, as well as outcome measures for cognitive status (MoCA), everyday cognition (PECC), anxiety levels (Hamilton scale), functional capacity (LB), sleep quality (PSQI), quality of life (ECOG), and subjective memory complaints (FACT-COG).

Impact: Findings from this study could support the development of targeted cognitive rehabilitation strategies and the implementation of clinical protocols for individuals undergoing breast cancer treatment. By addressing CRCI-an underrecognized but increasingly prevalent issue given rising survival rates-these interventions may contribute to improving patients' overall quality of life.