Sexual activity and prostate cancer risk in men diagnosed at a younger age.
Dimitropoulou P, Lophatananon A, Easton D, Pocock R, Dearnaley DP, Guy M, Edwards S, O'Brien L, Hall A, Wilkinson R, Eeles R, Muir KR; UK Genetic Prostate Cancer Study Collaborators; British Association of Urological Surgeons Section of Oncology.
Source
University of Nottingham Medical School, Queens Medical Centre, Nottingham, UK. pd317@medschl.cam.ac.uk
Abstract
OBJECTIVE:
To examine, in a case-control study, the association between the frequency of sexual activity (intercourse, masturbation, overall) and prostate cancer risk in younger men diagnosed at < or = 60 years old.
PATIENTS, SUBJECTS AND METHODS:
In all, 431 prostate cancer cases and 409 controls participated and provided information on their sexual activity. In particular, the frequencies of intercourse and masturbation during the participants' different age decades (20s, 30s, 40s, 50s) were collected.
RESULTS:
Whereas frequent overall sexual activity in younger life (20s) increased the disease risk, it appeared to be protective against the disease when older (50s). Alone, frequent masturbation activity was a marker for increased risk in the 20s and 30s but appeared to be associated with a decreased risk in the 50s, while intercourse activity alone was not associated with the disease.
CONCLUSION:
These findings could imply different mechanisms by which sexual activity is involved in the aetiology of prostate cancer at different ages. Alternatively, there is a possibility of reverse causation in explaining part of the protective effect seen for men in their 50s.
Avec la science, tu ne peux pas généraliser. Or c'est juste ca que vous faites depuis le début, dire que la masturbation réduit le risque de cancer de prostate. C'est seulement vrai pour les 50+ years old, c'est tout le contaire pour les jeunes. Chez les jeunes, la mastrubation augemente les risque de cancer du prostate. Capiche?