- Reaction score
- 42
Jonathan Strange said:Bryan said:The only study I've ever seen that tested topical CA found no effect at all on sebum output.
There are several studies indexed on pubmed showing that topical CA reduces acne lesions.
Which may or may not be related to reducing sebum production.
Jonathan Strange said:Not all of these studies measured sebum levels. Here's one that did: http://www.ncbi.nlm.nih.gov/pubmed/...nel.Pubmed_DefaultReportPanel.Pubmed_RVDocSum Perhaps the vehicle is important.
But they don't say anything in that abstract about measuring sebum levels after topical application of cyproterone acetate!
I also have a small problem with the fact that their study was with women exclusively. Several times I've cited Kligman's early study that found that giving external androgens to men had no effect on their sebum production, whereas it had a variable effect on women. His tentative explanation for that was that in men, their sebum production is already "maxed-out", so further androgenic stumulation doesn't cause any more sebum production (but it can do that in women). If that theory is correct, it may also take a more potent ANTI-androgenic effect in men to force their glands to make measurably less sebum.
Jonathan Strange said:Bryan said:As I pointed out on another site, I don't think there's even a SINGLE "study" (something published in a medical journal) that ever made such a claim. That odd statement about a "regression" with RU58841 apparently is just something written in some book, it's not something that Hideo Uno or any other researcher ever wrote about in an RU58841 study.
It's a small world.Yeah, you replied to my post (as Chris) on HLH with the same reference to Uno (1996).
Hey, Chris! So that's YOU!
Jonathan Strange said:I won't copy and paste my HLH reply here, but take another look at that thread if you get a chance. I'll try to clear up a few things for you here. Chang (2002), summarizing several RU studies, including Uno (1996b) and Obana, observed that early gains seen on RU treatment merely maintained or actually reversed in some cases after one year. I agree that his observations are hard to reconcile with Uno's. I'm inclined to value Chang's report over Uno's because (1) it was more recent than Uno's; (2) it's extremely unlikely that Chang misread Uno's or Obana's findings re Ru effects beyond one year -- especially since Chang actually worked with Uno AND Obana on RU58841 in 1997!! I included a reference to their joint work on RU58841 on HLH.
Yeah, I read your reply on HLH, I just didn't have any particular urge to say any more about it. Personally, I'm inclined to value Uno's report over Chang's. I think Chang went a bit off the deep end in all this, with this talk about "regression".
Jonathan Strange said:By the way, both Chang's (2002) and Uno's (1996) findings were published as books. Not sure why you're hung-up on format. And both are research scientists at reasonably well-regarded American universities.
Uno's quotation that I provided from that book was literally the first one I found when I went to search through my Study Stack. I can assure you that I have other studies of his (from medical journals), and NONE of them say or even hint that there is any "regression" of RU58841's effects after a short period of time. I'm going to attribute Chang's odd remark as just something unique to him, not the other RU58841 researchers.