Miguel Martín
Head of the Medical Oncology Department of the Gregorio Marañón Hospital and president of GEICAM
I think it's a serious study by the authors and the journal, which doesn't publish just anything and subjects articles to a strict peer-review.
The interesting thing about this study is that it provides very detailed data by area/country on incidence, mortality and trends in breast cancer, which we are all familiar with as a concept, but without such up-to-date and accurate figures.
[Regarding possible limitations] The quality of epidemiological studies depends on the quality of the patient and population records on which they are based, and these vary greatly between countries. But what is described in the article is what we have and it is the best possible approximation to reality.