IL1B and cancer: In similarly, for IL1-RN VNTR polymorphism, Cancer type (χ2 = 52.17, df = 6, P = 0.000) but not ethnicity (χ2 = 5.63, df = 2, P = 0.060) or source of controls (χ2 = 0.42, df = 1, P = 0.518) contributed substantially to that heterogeneity.