Pelage Pharmaceuticals Reports Phase 2a Results for Androgenic Alopecia
Pelage Pharmaceuticals has announced topline results from its Phase 2a trial of PP405, a new topical aimed at reactivating dormant hair follicle stem cells to treat androgenic alopecia (AGA). While the data show promise for a regenerative approach, there are important limitations and open questions to keep in mind.
The Study
The Phase 2a study enrolled 78 men and women with AGA, covering a range of hair types and skin tones. Subjects applied either PP405 or placebo once daily for four weeks and were monitored out to week 12. The main goals were to assess safety and detect early biological signals of hair regrowth.
Results
Here’s what the press release says:
On the safety side, there was no systemic absorption and no major side effects reported, which is a good starting point for a topical.
Efficacy-wise, the company highlighted that at week eight, approximately a month after completing the four-week treatment, 31% of men with higher degrees of hair loss in the PP405 group showed a more than 20% increase in hair density, compared to none in the placebo group.
However, there are a few important caveats:
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Small Sample Size & Short Duration: The trial enrolled fewer than 80 subjects, and treatment lasted just four weeks, with follow-up through week 12. This is extremely brief for a hair growth study, considering that a full hair cycle typically takes months. A one-month treatment is unlikely to yield reliable regrowth data.
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Limited Data: The press release mentions only the percentage of patients reaching a 20% increase threshold in one subgroup (men with more advanced loss). No full numerical data, mean hair counts, or images have been shared yet, so the magnitude and consistency of the effect are unclear.
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Durability Unknown: There’s no information on how long the effect lasts or whether continued use would build on the early response. Since the treatment stopped at week four, it’s unclear if patients kept the new growth or lost it soon after.
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Extension Study Needed: Pelage mentions a safety extension and a future Phase 3 trial in 2026; however, the actual plan for dosing, long-term safety, and real-world benefits still needs to be validated.
Reflections
In short, while PP405’s stem cell reactivation approach is intriguing, and could indeed be a step forward if confirmed, the data so far are preliminary and should be viewed as an early signal rather than definitive proof of robust regrowth.
Hopefully, future trials will run longer, include more patients, and provide clear, transparent before-and-after data to support the claims.
What’s your take on these early results? Are you optimistic about regenerative hair loss approaches? Let’s discuss below.
Agree the trial had a few issues to rectify. As mentioned, more participants and longer testing period. Also, are gains lost when topical PP405 is discontinued or applied at a lower potency or dosage.
Longer trial period could revel efficacy, interactions and tendencies after 12 weeks.
Dont you think topical drugs are not convenient to use ?
I wish they would speed up the process of getting this approved.
Promising, but seems like a waste of money to do such a half-assed study. Must have had their reasons, funding from investors maybe.
There is no mention of how the women in this trial responded..
Do we assume that their response was minimal?
Hello everyone, what is your educated guess on when hair regeneration will become commercially available? Like how many years away? Thank you
have you ever hear about the fusion rector constant (50 years)? Hate to say that, but apparently in hair regeneration we have a similar (10 years) constant… Waiting for a cure for over 13 years already…
Another trial and no hope. Same as always.
Given that Kintor and
Mallia Therapeutics (soon) have cosmetics
I wouldn’t be surprised if Pelage could also release cosmetics
because approval agencies are political institutions that must abide by laws that have no connection to reality
Rapanui—oh, I’m interested in that. In what way are those agencies political institutions that have no connection to reality? And how would you rather see it organized? The supplement industry is the Wild West with tons of expensive and unproven treatments. I guess that’s also not the way to go right?
The laws passed by a particular country must be respected.
For example, how many different drugs has the FDA approved where patients started dying after using those drugs, so they banned the use of that drug.
The question is how many experts are in the drug approval agencies, because politics appoints these people. The new Minister of Health appoints and dismisses people, that’s how it works in all countries in the world
Reality! If this was the cure all then they would fast track to Phase 3 today. Forget trying to work within FDA guidelines. That’s why the real promise drug will be coming from another country where they dont have to abide by government restrictions and hinderances. Stem cell research in China is light years ahead of the US. Good luck