ABO blood type, diabetes and risk of gastrointestinal cancer in northern China

Table 3 Association between blood types and cancer types

Cancer type	Control	Type A		Type B		Type AB		Type O
		OR1	95% CI	OR	95% CI	OR	95% CI	OR	95% CI
Esophageal	Type O	0.99	[0.70–1.40]	1.53	[1.10–2.14]	1.25	[0.76–2.08]	–	–
	All others	0.80	[0.60–1.05]	1.49	[1.12–1.97]	1.11	[0.71–1.74]	0.80	[0.60–1.07]
Gastric	Type O	0.99	[0.71–1.37]	1.03	[0.74–1.46]	1.28	[0.78–2.10]	–	–
	All others	0.93	[0.71–1.23]	1.03	[0.78–1.37]	1.24	[0.79–1.93]	0.96	[0.73–1.26]
Biliary	Type O	0.78	[0.56–1.08]	1.49	[1.09–2.05]	0.95	[0.57–1.57]	–	–
	All others	0.65	[0.49–0.86]	1.66	[1.27–2.17]	0.91	[0.58–1.43]	0.92	[0.70–1.21]
Pancreatic	Type O	1.05	[0.76–1.44]	1.26	[0.91–1.75]	1.44	[0.89–2.31]	–	–
	All others	0.88	[0.67–1.15]	1.20	[0.92–1.57]	1.28	[0.84–1.95]	0.86	[0.65–1.12]
Glioma	Type O	0.83	[0.62–1.12]	1.15	[0.86–1.54]	1.22	[0.81–1.84]	–	–
	All others	0.77	[0.60–0.98]	1.21	[0.95–1.56]	1.21	[0.84–1.76]	0.99	[0.78–1.26]
Thyroid	Type O	0.74	[0.56–0.99]	1.16	[0.87–1.55]	1.01	[0.66–1.54]	–	–
	All others	0.70	[0.54–0.89]	1.30	[1.02–1.66]	1.07	[0.73–1.57]	1.07	[0.84–1.35]

¹Only Odd ratios (ORs) for blood type are shown here, ORs for other factors are similar to Table 2. Here HBsAg, diabetes, sex, age and family history of cancer were excluded. ORs and respective 95% confidence intervals were calculated using logistic regression. For each cancer, every blood type group was compared with type O group and all the other groups separately.