[quote]KSman wrote:
DrSkeptix wrote:
KSman wrote:
PC: You exposure to estrogen is a bigger risk factor than T or DHT. …
This is one of those memes that float around here. Do you have a reference for this?
I doubt that it is proven true in intact men because:
–finasteride reduces pc risk by 25%. That is from a large trial in intact men. Finasteride, f course, is a selective inhibitor of T to DHT conversion, and if anything, leaves E2 stable or raises it very slightly
–Aromatase inhibitors in randomized trials do not lower the progression of BPH. That may be becauase they also raise T and DHT in most intact men.
–Aromatase inhibitors do not have a good track record in the therapy of prostate cancer (except with the co-administration of pharmacologic doses of glucocorticoids.) (This is a contentious issue lately)
–As a general statement, I will accept that in BPH, DHT may increase adenomatous hypertrophy and E may increase stromal hypertrophy. Is that where you are getting this bit about estrogen as a risk factor for PC?
There is a lot of material. These just popped up in google and not meant to really make the case:
http://ajp.amjpathol.org/cgi/content/abstract/155/2/641
http://endo.endojournals.org/cgi/content/abstract/136/5/2309
I often see things like this: "Contrary to common perception, testosterone does not cause prostate cancer. Young men have high levels of testosterone and old men low levels. If testosterone were the cause of prostate cancer, young men would be dying of prostate cancer. Studies had shown that men with the highest level of testosterone have the least prostate enlargement.
Conversely, men with the highest level of estrogen have enlarged prostates. Declining testosterone from aging, together with increasing level of estrogen, is the most likely reason for prostate enlargement and cancer in men.
The prostate is embryologically the same as the uterus in the female. Research Studies (Listed at the end of this newsletter) have shown that when prostate cells are exposed to estrogen, the cells proliferate and become cancerous. When progesterone or testosterone was added, cancer cell dies.
During the aging process, progesterone level falls in men, especially after age 60. Progesterone is the chief inhibitor of an enzyme called 5-alpha reductase that is responsible for converting testosterone to dihydrotestosterone (DHT), a much more potent derivative that is linked to prostate cancer.
When the level of progesterone falls in men, the amount of conversion from testosterone to DHT increases. Unfortunately, DHT is not as powerful an inhibitor of cancer cell compared to testosterone.
When the level of testosterone decreases, the relative level of estradiol in men increases. Estradiol, turns on BCL2 oncogene (Onco means cancer) and increases the risk of prostate cancer if adequate amount of progesterone is not there to counteract its effect by stimulating the P53 cancer protection gene."
Men with estrogen dominance [metabolic disorder or syndrome X] have many problems. One significant issue is higher rates of BPH and cancer then those with more favorable T:E ratios. Just as E is blocks some T at T receptors, T blocks some E at E receptors.
While population wide studies will never happen, much is known about men with ED problems. If we allow ED to be a proxy for adverse T:E ratios - there is the observation that men with ED also have higher rates of prostate problems. Yes, some ED is the result of CAD.
The real issue is causes of BPH.
Another theory is that when T goes low and men are no longer ejaculating, is that seminal fluid becomes rancid and the resulting inflammation spreads to the prostate, which then leads to damaged cells.
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OK. The two pathology articles are not news: ER receptors occurring in cancer is not news–we have years of experience using estrogens in the treatment of castrated men with prostate cancer.
Estrogen–and other hormones–may be involved as promotors, or instigators, but that is not the same as the meme, “Estrogen is more important as a cause of prostate cancer” than androgens. That simply is not proven the case.
The same contentions apply to BPH.
What you show here is hyprotheses, not proofs. For example, ED and the risk of prostate cancer: ED is also a marker for BPH, vascular disease, diabetes, “vascular inflammation,” etc…all correlates of the discovery of prostate cancer.
OK, ok. I will take off here. Let’s just say that I see a lot more information, and years of practical management, contrary to this notion. The notion has its place, but it isn’t first place.