29 Nov 2017 --- Diabetes and high BMI (a BMI over 25kg/m2) were the cause of 5.6 percent of new cancer cases worldwide in 2012 – equivalent to 792,600 cases, according to the first study to quantify the proportion of cancers attributable to diabetes and high BMI. The study is published in The Lancet Diabetes & Endocrinology journal. When considered individually, 544,300 cases of cases were attributable to high BMI (equivalent to 3.9 percent of all cancers), and 280,100 were attributable to diabetes (2 percent).