Just to mention that after that shortly after that paper was written, calcitonin nasal sprays were completely withdrawn across the whole of Europe because all of the clinical trials demonstrated that they are linked to raised risks of cancer. Canada are reviewing their position but the FDA don't seem to have decided to withdraw.

It's a risk that's important to weigh up particularly in circumstances where you are not someone who already has a diagnosis of osteoporosis where, arguably, the risk might be more worth taking. If you already had risk factors for cancer that would be something else to weigh up.