Sunday, November 2, 2008

Review of medical treament - nothing new

I've not added much to my blog posts because very little is happening with the understanding or management of Peyronie's Disease. I try to post when I find something novel.

This article doesn't have anything new, but it's a good summary of the urologist's current medical approach (emphasis mine and I've reformatted for readability):
Medical Management of Peyronie's Disease. [J Androl. 2008] - PubMed Result

Peyronie's disease (PD) is a wound healing disorder in which a fibrotic plaque forms in the tunica albuginea layer of the penis. It clinically presents as any combination of penile pain, angulation, and erectile dysfunction (ED).

Recent studies indicate that PD has prevalence of 3-9% in adult men.

While the exact etiology has not been established, PD likely results from a predisposing genetic susceptibility combined with an inciting event such as microtrauma during intercourse. During the initial acute phase (6-18 months), the condition may progress, stabilize, or regress.

For this reason authorities recommend a more conservative treatment approach with a trial of oral and/or intralesional pharmacotherapy before surgical reconstruction is considered.

Oral therapies most commonly employed include tocopherol (vitamin E), and para-aminobenzoate (Potaba), with colchicine, tamoxifen, propoleum and acetyl-L-carnitine being used less often. There are a limited number of long-term placebo- controlled studies with these oral agents and for the most part, studies have failed to show a consistent beneficial effect.

Intralesional injection therapy for PD is more commonly being used as a first line therapy. The current standard of care includes injection with interferon-alpha-2b, verapamil, or collagenase.

Interferon-alpha-2b, in particular, has been documented in a large, multicenter, placebo-controlled study to show significant benefit over placebo in decreasing penile curvature, plaque size, penile pain, and plaque density.

However, intralesional interferon is associated with post treatment flu-like symptoms unless premedicated with a non-steroid anti-inflammatory agent. Other available therapies that have not consistently shown efficacy in placebo-controlled studies include corticosteroids, orgotein, radiation, and extracorporeal shockwave therapy (ESWT).

Surgery is considered when PD men do not respond to conservative or medical therapy for approximately 1 year and cannot perform satisfactory sexual intercourse...
Translating from the jargon I'd summarize this as:
  1. Most treatments have been shown not to work and should be abandoned.
  2. Interferon-alpha-2b injection may be worth trying in the acute phase, but be ready for side-effects. I'd recommend asking for an explanation of exactly how much improvement was found, and whether the improvement was age group specific. Interferon injections have been proposed for many problems and they are usually found to be ineffective. This would be more persuasive if there were solid physiologic reasons to think it should work.
  3. The "wound healing" explanation is not confirmed. I suspect the cause varies with age of onset, and that there may be a common predisposition both to injury and to dysfunctional healing.
The article does not address how well surgery works, it's a medical review. Long term surgical outcomes have been mixed at best.

The take away is to consider the interferon but cautiously. We haven't learned all that much about Peyronie's in the past 10 years, but at maybe we're using fewer ineffective treatments.

5 comments:

Anonymous said...

I am glad you have updated your post.

Despite your advice I signed up for Xiaflex trials. Subsequently, I was advised that if the drug was effective, but I received the placebo, I would NOT be offered the drug at a later date. This seems like a significant disincentive to participate in clinical trials. Is this standard procedure?

I have been dosed and in a few weeks will undergo tests to see if there are any changes.

hortenis said...

Wow, that's interesting.

Maybe they're thinking that since nobody would know if you'd taken the drug or not, it wouldn't be safe to get it in the future.

Certainly a disincentive.

Anonymous said...

I wrote to you previously and indicated that I was in the Xiaflex trial and was advised that if I received the placebo, I would not be offered the drug at a later date. The company has now changed its position and indicated that if the findings were positive and I did receive the placebo, I would be offered the drug. FYI after completing the series of injections, there is only a very minimal improvement.

I have read a number of articles about a treatment known as platelet rich plasma therapy which seems effective and safe in treating wounds and injured soft tissue. To this laymen with Peyronies, it seems like this treatment is a good fit. Do you concur or am I missing something? Thank you.

Unknown said...

This looks potentially interesting:

http://www.urotoday.com/3351/browse_categories/peyronies_disease/replacement_of_plaque_by_buccal_mucosa_in_the_treatment_of_peyronies_disease_a_report_of_27_cases__abstract.html

Together with:

http://en.wikipedia.org/wiki/Buccal_mucosa

ProExtender Penis Enlargement System said...

Do you have any knowledge on the success of traction devices for the treatment of Peyronie's disease?