Comments like this suggest a fundamental lack of understanding of cancer and mutagenesis. Cancer is not black and white. Cells are constantly getting mutations due to various factors such as simple errors in replication to environmental mutagens, carcinogens, and free radicals. These errors in DNA replication can build up, over time, to produce cancer. This process can take a VERY VERY long time, and the presence of IGF regulates how quickly cells divide (probability of errors increases with more division) and how often they self destruct (apoptosis). Normally, cells will self destruct when they detect DNA errors, but with excess IGF, the cell cycle does not arrest like it should, and it often replicates when it shouldn't. This is how cancer it "created" by IGF...but you can think of it more like IGF promoting cancer. Obviously LR3 IGF would be worse of a culprit than GH or GHRH for example, b/c the former is unregulated by binding proteins. I would not recommend anyone use LR3 for extended periods or for purposes other than healing injuries in low doses (<20mcg per day). GH seems to have less of an effect on cancer promotion, but I would suspect still would increase likelihood.