It’s possible, but it isn’t known for sure.
Cancer wasn’t a side effect reported in initial studies of Lantus. Since then, there have been reports that long-term use of Lantus may be linked to an increased risk of breast cancer. But other studies have shown no connection between breast cancer and Lantus use.
Reports have also shown that diabetes, which Lantus is used to treat, may also raise your risk of certain cancers. These include stomach cancer and kidney cancer. So it’s possible that diabetes, instead of Lantus, could raise your risk of certain cancers.
If you’re concerned about your risk of cancer with Lantus, talk with your doctor.