Evaluating the De-Escalation of Surveillance for Patients Who Have Undergone Curative Treatment for Breast Cancer

Inclusion Criteria: * Female participants aged 18 years or older * Prior diagnosis of primary breast cancer treated with curative intent * Currently under cancer surveillance and at the 24-month follow-up timepoint * No clinical or radiological evidence of disease recurrence or metastasis at the time of recruitment (e.g., no palpable mass, skin or nipple changes, or suspicious findings on imaging) * Able to read, write, and speak English sufficiently to complete the EuroQol 5-Dimension 5-Level (EQ-5D-5L) questionnaire (paper-based or via telephone) * Resident in the Republic of Ireland with a fixed address and intention to continue follow-up within the Irish healthcare system Exclusion Criteria: * Evidence of breast cancer recurrence or metastatic disease at the time of recruitment * Inability to provide informed consent * Inability to complete study questionnaires (e.g., due to language barriers or cognitive impairment) * Not resident in the Republic of Ireland or not intending to remain in follow-up within the Irish healthcare system