Factors associated with the occurrence of cardiovascular disease events (including AF) were an overexpression of HER-2 (HR 2.6 [1.21–5.56] p < 0.011), UICC-stage III tumors or more (HR 5.47 [2.78–10.76] p < 0.001) and pre-existing cardiovascular risk factors (HR 2.91 [1.36–6.23] p < 0.004). The gene discussed is ERBB2; the disease is atrial fibrillation.