Abstract

A previous, proof-of-concept clinical study suggested that dermal sheath cup cell injections into the affected areas of male/female pattern hair loss (PHL) may have some amelioratory effects, the clinical efficacy of which needs further examination. A phase III equivalent clinical study was conducted to further probe the therapeutic potential of this novel approach and verify its safety and efficacy in improving the appearance of PHL. Thirty-six participants with PHL were injected with dermal sheath cup cell harvested from non-affected occipital hair follicles twice in quarterly intervals. Global photographic assessment and phototrichogram were performed in a blinded manner. Patient-reported outcomes were assessed for 12 months. On global photographic assessment, 30% of the participants showed improvement. The analysis of phototricogram data detected the increases in the cumulative hair diameter, hair cross-sectional area, and mean hair diameter of 107.6 ± 152.6 μm/cm2 , 13069.1 ± 10960.7 μm2 /cm2 , and 0.9 ± 0.9 μm (ratios vs. baseline: +1.4%, +3.4%, and +2.2%), respectively. The female and high terminal hair ratio groups achieved better improvement. Of the total participants, 62.9% noted some degree of improvement. No serious adverse events were detected. This novel approach exhibited visible effects while ensuring safety and patient satisfaction. Therefore, it holds promise as a possible therapeutic option for treating PHL, especially in women.

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