I believe I responded to this allegation in a different topic*, but I’ll repeat it in summary here:
I looked up papers on the association of Lantus and pancreatic cancer, and found that the entire body of research since its release provides evidence that there is no positive association between use of insulin glargine and cancer. Type 2 diabetes, on the other hand, has a very high positive association with pancreatic (and some other) cancers, and this is likely why more patients in Lantus trials had pancreatic cancer than the general public.
This is one of the many reasons why people should try to understand the way science (and statistics) work, rather than take information out of context and draw wild conclusions and then repeat them online. The association of insulin glargine and pancreatic cancer has been very well studied, and there is no evidence that they are linked.
* edit: added the link to the other thread, because it has links to and quotes from peer-reviewed papers evaluating the claims of an association between insulin glargine and pancreatic cancer. This is the way I evaluate such claims: look up (several) papers on the topic; read the papers; and come to a conclusion based on the evidence.