Table 4. Relative risk of pancreatic cancer (RR) diagnosed in siblings of individuals affected by cancer.

	Age of diagnosis of siblings with cancer
	Any age		0–55		56–71
Sibling cancer site	N	RR (95% CI)	N	RR (95% CI)	N	RR (95% CI)
Upper aerodigestive tract	8	1.28 (0.64–2.57)	6	2.03 (0.91–4.53)	2	0.61 (0.15–2.45)
Oesophagus	8	3.39 (1.69–6.79)	2	3.16 (0.79–12.6)	6	3.49 (1.57–7.77)
Stomach	9	1.35 (0.70–2.59)	3	1.13 (0.36–3.50)	6	1.51 (0.68–3.37)
Colon	18	0.96 (0.60–1.53)	7	0.96 (0.46–2.01)	11	0.96 (0.53–1.74)
Rectum	13	1.09 (0.63–1.89)	3	0.69 (0.22–2.15)	10	1.32 (0.71–2.46)
Liver	11	2.07 (1.15–3.75)			10	2.88 (1.55–5.36)
Pancreas	19	3.26 (2.07–5.12)	9	5.06 (2.63–9.74)	10	2.47 (1.33–4.59)
Larynx	2	1.11 (0.28–4.46)
Lung	25	1.09 (0.73–1.61)	13	1.74 (1.01–3.00)	12	0.77 (0.44–1.37)
Breast	88	1.19 (0.96–1.48)	59	1.37 (1.06–1.77)	29	0.95 (0.66–1.38)
Cervix uteri	7	0.79 (0.38–1.65)	6	0.79 (0.35–1.75)
Endometrium	18	1.50 (0.95–2.39)	8	1.68 (0.84–3.36)	10	1.39 (0.75–2.59)
Ovary	11	0.95 (0.52–1.71)	9	1.26 (0.66–2.43)	2	0.45 (0.11–1.82)
Prostate	47	1.19 (0.89–1.59)	9	2.36 (1.23–4.54)	38	1.07 (0.77–1.47)
Testis	4	1.09 (0.41–2.90)	3	0.88 (0.28–2.72)
Other male genital organs	3	3.57 (1.15–11.1)	3	6.48 (2.09–20.1)
Kidney	11	1.17 (0.65–2.11)	8	1.86 (0.93–3.73)	3	0.59 (0.19–1.84)
Urinary organs	17	1.24 (0.77–2.00)	9	1.64 (0.85–3.16)	8	0.98 (0.49–1.96)
Melanoma	19	0.94 (0.60–1.48)	13	0.98 (0.57–1.69)	6	0.88 (0.39–1.95)
Squamous cell skin	10	1.31 (0.70–2.44)	4	1.31 (0.49–3.49)	6	1.31 (0.59–2.93)
Eye	3	3.26 (1.05–10.1)	3	4.70 (1.52–14.6)
Nervous system	15	0.88 (0.53–1.45)	10	0.92 (0.49–1.71)	5	0.80 (0.33–1.93)
Endocrine glands	13	1.38 (0.80–2.39)	5	0.81 (0.34–1.95)	8	2.51 (1.25–5.02)
Connective tissue	9	3.12 (1.62–6.00)	5	2.70 (1.12–6.50)	4	3.87 (1.45–10.3)
Hodgkin's disease	3	1.08 (0.35–3.36)	3	1.25 (0.40–3.89)
Non-Hodgkin's lymphoma	10	0.76 (0.41–1.41)	6	0.87 (0.39–1.95)	4	0.63 (0.24–1.69)
Leukaemia	8	0.88 (0.44–1.75)	7	1.54 (0.73–3.24)

Bold signifies P<0.05.