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Histogen update

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Histogen to present one year clinical trial data at Society for Investigative Dermatology Annual Meeting

SAN DIEGO, April 13, 2010 - Histogen, Inc., a regenerative medicine company developing solutions based on the products of newborn cells grown under embryonic conditions, today announced the one year data findings of its Hair Stimulating Complex (HSC) pilot clinical trial. Statistically significant new hair growth was seen in HSC-treated subjects at this follow-up timepoint, one year after their single treatment with HSC.

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In addition to the number of new hairs, a statistically significant (p<0.05) increase in hair density, which is directly related to hair count over the treatment areas, was also seen at the one-year timepoint. Other efficacy factors, such as hair thickness and terminal hair density, showed an upward trend at this timepoint as well. The pilot trial tested two formulations of HSC and, although one formulation was determined to be superior, significant new hair growth was seen in both groups. (p=0.032)

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This new data indicates that a single HSC treatment not only results in rapid hair growth (statistically significant increases in the number of terminal hairs, hair thickness density and hair shaft diameter was seen at three months),but that these results persist over time.

"Seeing continued hair growth at this one year follow-up is truly groundbreaking," said Dr. Craig Ziering, Founder of Ziering Medical and Principal Investigator on the HSC clinical trial. "Not only do currently available non-surgical treatments show limited hair regrowth, but any new hair is lost shortly after discontinued use. We now have preliminary evidence that HSC significantly increases hair counts, and that the effects of a single treatment are lasting."

The pilot 24 subject clinical trial of HSC was a double-blind, placebo-controlled evaluation of safety in the clinical application of the product as an injectable for hair growth. Quantitative analysis of clinical macrophotography and subject biopsies were utilized to evaluate treatment safety and efficacy. No adverse events were seen at any timepoint, including the one year follow-up.

HSC is a proprietary formulation of naturally secreted embryonic-like proteins and growth factors. In addition to Wnt 7a, which is recognized to be critical in the induction and maintenance of hair follicle growth, the complex contains a wide variety of factors typically produced by embryonic cells and which are important to the hair cycle, such as follistatin. While these embryonic-like materials are amplified under Histogen's unique manufacturing conditions, undesirable proteins and growth factors, including Wnt 5a, which has been shown to be associated with cancer, are eliminated.

"The development of hair follicles is the consequence of a complex interplay of factors that is still being unraveled," said Dr. Jonathan Mansbridge, Histogen's Chief Scientific Officer. "However, several factors critical to hair growth, such as Wnt 7a, follistatin, VEGF and KGF, are present in HSC, and their secretion by the cells is stimulated by the culture conditions we use. The embryonic conditions under which our cells are manufactured not only upregulates genes associated with hair growth, but induces significantly more production of these critical factors than seen with other culture conditions."

HSC is a unique composition resulting from growing newborn cells under embryonic conditions. The hypoxia/microgravity results in large amounts of follistatin (41.6 ng/ml in HSC versus 6.75 ng/ml in normal culture conditioned media),VEGF (9.1 ng/ml versus 2 ng/ml),KGF (5.4 ng/ml versus 2.1 ng/ml),and a lack of the scar-related TGF beta (0 ng/ml versus 1.7 ng/ml in normal cultures). This composition is covered by pending US patent #2010/0047305.

The full results of the HSC clinical trial will be presented at the Society for Investigative Dermatology (SID) Annual Meeting, taking place in Atlanta, May 5-8, 2010. Presentation abstracts have been published by SID are now available for review at sid.abstractcentral.com/login.

Histogen is currently in planning stages for the next clinical trial of HSC, which is scheduled to begin in late 2010. This next trial will further examine the safety and efficacy of the HSC product as an injectable for hair growth, and will also evaluate optimum treatment dosing and delivery. Histogen is currently seeking a Series B investment round, which will be utilized to finance these next stages of HSC development and trials.

About Histogen
Histogen, launched in 2007, seeks to redefine regenerative medicine by developing a series of high value products that do not contain embryonic stem cells or animal components. Through Histogen's proprietary bioreactors that mimic the embryonic environment, newborn cells are encouraged to naturally produce the vital proteins and growth factors from which the Company has developed its rich product portfolio. Histogen has two product families - a proprietary liquid complex of embryonic-like proteins and growth factors, and a human Extracellular Matrix (ECM) material, ExCeltrix.

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www.ishrs.org/PDF/F4-2009.pdf.

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Histogen Hair Regrowth Clinical Trial Presented at ISHRS Annual Meeting
Data shows statistical significance at three key efficacy endpoints

SAN DIEGO, July 27, 2009 - Histogen, Inc., a regenerative medicine company developing solutions based on the products of newborn fibroblasts grown under embryonic conditions, shared the results of the Company's preliminary clinical trial of Histogen's HSC human hair regrowth product for the first time at the International Society of Hair Restoration Surgeons (ISHRS) Annual Scientific Meeting. Dr. Craig Ziering, founder of Ziering Medical and principal investigator on the clinical trial, addressed attendees on July 25th, 2009 during the conference, taking place in Amsterdam July 22-26, 2009.

Patients treated with Histogen's Hair Stimulating Complex (HSC)










3 months
Hair count + 22.4%
Terminal hair + 27.8%
Thickness + 23.9%






Baseline results








Hair Regrowth results after 3 months













3 months
Hair count + 23.7%
Terminal hair + 24.2%
Thickness + 22.2%






Baseline results








Hair Regrowth results after 3 months


HSC is a proprietary formulation of naturally secreted embryonic proteins, growth factors and contains the first naturally stabilized, bioactive solution of Wnt proteins and their cofactors, which have been implicated in the induction of new hair follicle formation and growth.

The five-month double-blind, placebo-controlled clinical trial was focused on evaluation of safety in the clinical application of Histogen's Hair Stimulating Complex (HSC),formerly known as ReGenica. The 24 subject clinical trial was designed to examine the safety and efficacy of a single injection of HSC alone, as well as in combination with three different perturbation methods. Quantitative analysis of clinical macrophotography and subject biopsies were utilized to evaluate treatment safety and efficacy.

Efficacy at 12 weeks with one Application of HSC


  • cumulative thickness density (mm/cm2) p=0.0249[/*]
  • thickness mean (um) p=0.0402[/*]
  • terminal hair density (n/cm2) p=0.0029
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84.6% of the patients receiving one injection of Histogen's serum-free HSC showed an increase in terminal hair 12 weeks post-injection, with a statistically significant (p<0.05) increase in the number of terminal hairs, cumulative hair thickness density and hair thickness mean. Perturbation did not enhance the results seen with HSC. There were no adverse reactions seen in any of the treated 24 patients at baseline, 12 weeks, or the 22 week endpoint.

"We are excited that our trial demonstrated safety and efficacy of our HSC product, which contains Wnt proteins and other growth factors important to hair follicle maintenance and growth," said Dr. Gail K. Naughton, CEO of Histogen. "Wnt signaling has been shown by a number of experts in the field to be responsible for initiating epidermal stem cells to form new hair follicles in mice, and to be important in maintaining the hair inducing activity from existing follicles. Histogen's trial is the first demonstration that compounds containing bioactive Wnt increase hair growth in humans."

While additional clinical evaluation is needed to further examine product safety, efficacy and treatment specifications, the preliminary clinical trial of HSC represents a potentially significant new treatment option for the millions suffering from hair loss. Of the 87 million people in the United States that suffer from hair loss, it is estimated that only 2-7% seek surgical or pharmacological treatment. The same is true internationally due to the general lack of effective medical options for this widespread condition.

"Hair restoration treatments range in effectiveness and invasiveness. All of the current treatment options share the common goal of saving and redistributing existing hairs," said Dr. Craig Ziering. "For the millions of men and women who grapple every day with their hair loss, the results of our HSC trial indicate the potential for a phenomenal treatment option that stimulates growth of new hairs along with increasing the thickness of existing hairs. Histogen's HSC represents a potentially major paradigm shift from conventional treatment options to one that can promote the growth of new or dormant hairs using principles of the body's own regenerative mechanisms."

About Histogen
Histogen, launched in 2007, seeks to redefine regenerative medicine by developing a series of high value products that do not contain embryonic stem cells or animal components. Through Histogen's proprietary bioreactors that mimic the embryonic environment, newborn fibroblasts are encouraged to naturally produce the vital proteins and growth factors from which the Company has developed its rich product portfolio. Histogen has two product families - a proprietary liquid complex of embryonic-like proteins and growth factors, and a human Extracellular Matrix (ECM) material, ExCeltrix.