A new study confirms, yet again, that osteosarcoma, a type of bone cancer, is not associated with community water fluoridation (CWF). This the seventh such study since a 1990 report of an animal study suggested such a link.
The 199o study exposed rats to very high concentrations of fluoride so the results were not relevant to CWF. But, of course, this did not stop anti-fluoride campaigners using the study to argue that CWF causes osteosarcoma.
The citation for this new study is:
Kim, F. M., Hayes, C., Burgard, S. L., Kim, H. D., Hoover, R. N., Osteosarcoma, N., … Couper, D. (2020). A Case-Control Study of Fluoridation and Osteosarcoma. Journal of Dental Research 1.
This was a hospital-based study where patients diagnosed with osteosarcoma were compared with control patients diagnosed with other bone tumours or different conditions. This figure summarises the findings.
The only statistically significant effects show a reduced likelihood of osteosarcoma diagnosis for people living in fluoridated areas – compared with those living in non-fluoridated areas (the red triangles in the figure). These were for people who never drank water and people who had lived in fluoridated areas for 0% to 50% of their lives. It is likely the effects for people who did drink bottles water and those who had lived in fluoridated areas for 50% to 100% or 100% of their lives are not statistically significant because of the smaller numbers involved (The green circles in the figure).
It’s been a bad week for the anti-fluoride crowd – the science keeps proving them wrong. Perhaps that is why they are silent about these new studies.