Development and Validation of a Personalized Digital Healthcare Model for Managing Side Effects in Breast Cancer Survivors

Inclusion Criteria: * Individuals who have undergone surgery for Stage 1-2 breast cancer * Individuals who have had a unilateral mastectomy * Aged 18 years or older and under 65 years * Possessing a smartphone with either an Android or iOS operating system * Individuals who voluntarily decide to participate after receiving detailed information about the study and provide written consent Exclusion Criteria: * Individuals who have undergone mastectomy only and are not receiving chemotherapy, radiation, or hormone therapy * Individuals with severe comorbidities (such as underlying diseases, neuromuscular disorders, cognitive or mental impairments, visual disabilities, etc.) that make it difficult to use the application or participate in the exercise intervention Discontinuation Criteria * Individuals who undergo delayed breast reconstruction surgery during the study period * Individuals who develop severe complications or experience cancer metastasis or recurrence in other organs during the study period, leading to a change in treatment * Occurrence of a major illness unrelated to study participation * Failure to comply with the instructions of the study physician * Situations where the participant voluntarily withdraws from the study or becomes unable to continue participating