Low Testosterone Levels and Grade Group Progression Among Localized Prostate Cancer Patients on Active Surveillance: A Retrospective Cohort Study https://www.auajournals.org/doi/10.1097/JU.0000000000004986 US study reveals: Too little testosterone is considered a warning sign for aggressive prostate cancer https://www.fr.de/panorama/krebs-forscher-entdecken-ungeahnten-zusammenhang-zr-94243024.html