Although the association of adiposity with cancer risk has been extensively studied, associations for only 11 cancers

(oesophageal adenocarcinoma, multiple myeloma, and cancers of the gastric cardia, colon, rectum, biliary tract system, pancreas, breast, endometrium, ovary, and kidney) were supported by strong evidence.

Other associations could be genuine, but substantial uncertainty remains. Obesity is becoming one of the biggest problems in public health; evidence on the strength of the associated risks may allow finer selection of those at higher risk of cancer, who could be targeted for personalised prevention strategies.

Adiposity and cancer at major anatomical sites: umbrella review of the literature | The BMJ (external - login to view)