Table 3.

Radiation as a risk factor for breast cancer

Risk factor	Author	Year	Type of study	Conclusion	Population
Ionizing radiation	Sigurdson et al.19	2010	Cohort study	Significant evidence of an association between breast cancer and exposure to ionizing radiation.	Radiology technicians
	Bhatti et al.18	2010	Case-control study	No clear association between radiation and an increase in breast cancer rates.	Radiology technicians
	Schonfeld et al.20	2010	Case-control study	Significant association between breast cancer and occupational exposure to radiation.	Radiology technicians
	Buitenhuis et al.21	2013	Case-control study	Low risk of breast cancer at the current level of occupational exposure to ionizing radiation.	Varied
	Preston et al.22	2016	Cohort study	Occupational radiation was positively associated with the risk of developing breast cancer.	Radiology technicians
Non-ionizing radiation	Chen et al.23	2013	Meta-analysis	Non-ionizing radiation may be related to an increased risk of breast cancer in women, especially those in the pre-menopausal period.	Varied
	Sun et al.24	2013	Meta-analysis	May be associated with an increased risk of male breast cancer.	Men
	Grundy et al.25	2016	Case-control study	Occupational exposure to magnetic fields for at least 30 years led to a near three-fold increase in breast cancer risk. However, the limitations of the study may have influenced these findings.	Men
	Chen et al.26	2010	Meta-analysis	No association.	Varied
	Li et al.36	2015	Cohort study	No association.	Textile workers