This prospective prehabilitation study aims to evaluate the effects of an individualized exercise program initiated before breast cancer surgery and continued for 12 months postoperatively. The intervention focuses on incidence of breast cancer-related lymphedema, improving functional outcomes, range of motion, pain, and patient-reported measures throughout the surgical and recovery phases. Participants receive structured, personalized exercise instructions and are monitored regularly during follow-up.

The study assesses the trajectory of extremity volume difference, early postoperative pain, the recovery pattern of shoulder range of motion and changes in functional status across the first postoperative year. Additionally, it examines the incidence of lymphedema and explores demographic and clinical determinants affecting patient outcomes. The findings are expected to provide evidence for the integration of prehabilitation into standard breast cancer care pathways.

This prospective prehabilitation study investigates the effectiveness of an individualized exercise program initiated before breast cancer surgery and radiation therapy maintained for 12 months postoperatively. The intervention was designed to optimize physical readiness for surgery, support early postoperative recovery, and promote long-term functional improvement. Participants received structured exercise instructions delivered through visual and written materials, and adherence was reinforced through regular follow-up contacts.

The primary focus of the study is to characterize postoperative functional trajectories, including pain intensity, shoulder range of motion (ROM), upper-extremity function, and patient-reported outcomes. Particular emphasis is placed on the early postoperative period, during which pain typically increases and functional limitations become more pronounced. Longitudinal assessments allow observation of recovery patterns across all ROM planes, with anticipated improvements in flexion and abduction by the third postoperative month and further recovery in internal and external rotation by the sixth month.

A secondary objective is to monitor the development of lymphedema, defined by limb volume differences and physical signs of edema. The study also explores demographic and clinical determinants that may influence treatment outcomes, aiming to identify subgroups that benefit most from prehabilitation. By evaluating functional, symptomatic, and quality-of-life outcomes across a 12-month period, this study provides evidence to support the incorporation of preoperative exercise interventions into standard breast cancer care pathways.

Inclusion Criteria:

• Women aged 18 years or older
• Diagnosed with breast cancer and scheduled for surgical treatment
• Able to perform prescribed upper-extremity exercises
• Able to provide informed consent and complete follow-up assessments.

Exclusion Criteria:

• Presence of metastatic disease at baseline
• Neurological, orthopedic, or systemic conditions limiting upper-extremity mobility
• Prior breast or axillary surgery on the same side
• Planned neoadjuvant chemotherapy that would delay the initiation of the exercise program
• Inability to comply with the exercise instruction or follow-up schedule

female breast cancer survivors