Breast cancer follow-up	Level of evidence	Recommendation strength
6.1	Interval for follow-up
6.1.1	1–4 times per year within 5 years of surgery[12]	II	A
6.1.2	Annually after 5 years of surgery[12]	II	A
6.2	Content of follow-up
6.2.1	Loco-regional recurrence
	a. Ultrasound[12]	II	A
	b. Mammography[12,29]	I	A
6.2.2	Distant metastasis
	a. Screening of distant metastases is not recommended for asymptomatic patients[30,31]	I	A
	b. Tumor markers	III	C
	c. CT of chest	III	C
	d. CT/ ultrasound/MRI of abdomen	III	C
	e. Bone scan	III	C
	f. FDG PET/CT	III	C
6.2.3	Complication of surgery
	Lymphedema[12]	II	A
6.2.4	Complication of medication
	a. Endometrial evaluation during treatment of tamoxifen[12]	II	A
	b. Assessment of bone mineral density during treatment of aromatase inhibitor[12]	II	A
6.2.5	Guidance of a healthy lifestyle[12]	II	A

CT: Computed tomography; FDG PET: ¹⁸F-deoxyglucose positron emission tomography; MRI: Magnetic resonance imaging.