Progesterone and not estrogens or androgens cause breast cancer

In May 2023, we published a scientific paper entitled “Progesterone from ovulatory menstrual cycles is an important cause of breast cancer” in the journal “Breast Cancer Research” (BCR: Impact Factor 11.2) by Herjan J. T. Coelingh Bennink, Iman J. Schultz, Marcus Schmidt, V. Craig Jordan, Paula Briggs, Jan F. M. Egberts, Kristina Gemzell‑Danielsson, Ludwig Kiesel, Kirsten Kluivers, Jan Krijgh, Tommaso Simoncini, Frank Z. Stanczyk and Robert D. Langer.

In September 2023 the journal “Climacteric” (Impact Factor 3.0) published a critical paper commenting on our BCR paper entitled “Lack of evidence that progesterone in ovulatory cycles causes breast cancer” by A. Gompel, V. Seifert-Klauss, J. A. Simon & J. C. Prior.

We were pleased that the Editor-in-Chief of Climacteric, Rod Baber, provided us with the opportunity to publish a full length paper as “Letter to the Editor” as rebuttal to the Gompel et al paper.
This rebuttal entitled “Progesterone and not estrogens or androgens cause breast cancer” has been published on 10 January 2024 in Climacteric by Herjan J.T. Coelingh Bennink and Frank Z. Stanczyk on behalf of all BCR authors.