Use of the levonorgestrel-releasing intrauterine system in breast cancer patients

To the Editor:

The observational study by Trinh et al.(1) concludes that there is a higher recurrence rate when breast cancers are detected during the use of a LNG-IUS and when it is not removed after diagnosis. Although the authors mainly generate several hypotheses around their observations, we would like to warn about  inappropriate interpretation of their data and premature conclusions, as such a message was released in a couple of Belgian newspapers recently.(2)