Inclusion Criteria:

• Women aged 18 years or older
• Diagnosed with stage I, II, or III invasive breast cancer confirmed by pathology or cytology
• No signs of metastatic disease (cancer that has spread to other parts of the body)
• Scheduled to receive local treatment, including:

Surgery

And/or neoadjuvant or adjuvant therapy such as chemotherapy, radiation, hormone therapy, or targeted therapy

• Willing and able to complete health questionnaires and attend follow-up visits
• Has given written informed consent to join the study

Exclusion Criteria:

• Have metastatic breast cancer or local recurrence
• Have already received curative treatment (surgery, chemo, etc.) for the current breast cancer before joining the study
• Are currently pregnant or breastfeeding
• Have a history of another cancer within the past 5 years (except for non-melanoma skin cancer or in-situ cervical cancer)
• Are unable to participate in the study due to mental, physical, or legal reasons (for example, under legal guardianship or imprisonment)