TABLE 1.

Summary of the Published Reports Showing Enhanced Risk of BCCs after Ionizing Radiation Exposure at Different Settings

Cohort	Size	Type of radiation	BCC no./cases	BCC risk (95% CI)	Year studied	BCC risk factors	Ref.
A-bomb survivors	79,972	Neutrons and γ rays	78	ERR1Sva = 1.0 (0.41–1.89)	1958–1987	dose, age at exposure	17
A-bomb survivors	80,158	Neutrons and γ rays	123	ERR1Gy = 15 (4.2–43)/0–9 years; 5.7 (2.2–13)/10–19 years; 1.3 (0.35–2.9)/20–39 years; 0.19 (−0.32–1.2)/>40 years	1958–1996	dose, age at exposure	18
A-bomb survivors	105,427	Neutrons and γ rays	166	ERR1Gy =0.57 (0.18–1.38) ERR/Gyb =0.48 (0.12–1.3)/<1 Gy; 2.64 (2.2–3)/>1 Gy	1958–1998	dose, age at exposure	21
A-bomb survivors	112,305	Neutrons and γ rays	106	ERR1Sv = 1.9 (0.8–3.9)	1958–1987		22
A-bomb survivors	80,000	Neutrons and γ rays	80	ERR/Sv=21(4.1–7.3)/0–9 years; 6.7 (2.1–17)/10–19 years; 1.7 (0.5–3.8)/20–39 years; 0.7 (−0.05–2.2)/>40 years	1958–1987	dose, age at exposure	23
HCT recepients	4,810	Total body irradiation	158	Univariate hazard ratio = 1.8 (1.2–2.6)/≥14 Gy Cumulative incidence = 6.5% (5.3–7.7)/20 years	1969–2003	dose, race, age at exposure	12
HCT recepients	6,306	Total body irradiation	202	RR c = 1.76 (1.36–2.30)/all age combined ERR/Gy = 1.49 (0.64–3.17)/0–9 years; 0.55 (0.28–1.0)/10–19 years; 0.11 (0.06–0.18)/20–39 years; 0.02 (−0.01–0.06)/>40 years	1969–2006	age at exposure	33
Childhood cancer survivors	12,858	Radiotherapy	199	ORd/Gy = 1.09 (0.49–2.64)	1994–2003	dose	31
PatientTinea Capitis	10,834	X rays	41	RR = 4.9 (2.6–8.9)	1950–1980	dose, skin color, age at exposure	15
Patient with Tinea Capitis	2,215	X rays	11	Cumulative incidence = 22.6 (control = 2.6)/29 years	1968–1973	radiation	35
Patient with Tinea Capitis	2,200	X rays	80	RR = 3.8 (2.8–5.2)	1962–1979	skin color, Caucasian background	16
Patient with Tinea Capitis	2,224	X rays	328	RR = 3.6 (2.3–5.9)	50 years	North European ancestry, skin color, severe sunburn, age at exposure	42
Patient with Tinea Capitis	1,690	X rays	1553	RR = 2.3 (1.7–3.1)	4 years	age at exposure, years since first exposure, treatment for acne	43
Radiologic technologists	65,304	X rays	1,355	RR=2.16 (1.14–4.09)/before 1940; 2.04 (1.44–2.88)/1940s; 1.42 (1.12–1.80)/1950s;	1983–1998	dose, skin color	13
Radiologic technologists	65,719	X rays	3,615	ERR/Gy = 0.59 (−0.11–1.42)/<30 years; 2.92 (1.39–4.45)/before 1960	1983–2005	age at exposure	55
Residential radon exposed	51,445	Alpha particles	3,243	IRRe/100 Bq/m3 = 1.14 (1.03–1.27)	1993–2011	dose, socio-economic status, living places	80

^aExcess relative risk at 1 Sv

^bexcess relative risk per 1 Gy

^crelative risk

^dodds ratio

^eincidence rate ratio.