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Updated: Jun 2, 2026

Cell Population Analyses During Skin Carcinogenesis
Published on: August 21, 2013
Targeting superficial or nodular Basal cell carcinoma with topically formulated small molecule inhibitor of
Tracy Tang1, Jean Y Tang, Dongwei Li
1Genentech, South San Francisco, California 94080, USA.
Purpose:
Inappropriate activation of the Hedgehog (Hh) signaling pathway in skin is critical for the development of basal cell carcinomas (BCC). We have investigated the anti-BCC efficacy of topically-applied CUR61414, an inhibitor of the Hh signal transduction molecule Smoothened.
Experimental Design:
In preclinical studies, we used a depilatory model to evaluate the ability of topical formulations of CUR61414 to repress Hh responsive cells found at the base of hair follicles in normal skin. We also tested the in vivo effects of topical CUR61414 on murine BCCs developed in Ptch1 (+/-) K14-CreER2 p53 fl/fl mice. In a phase I clinical study, we evaluated the safety, tolerability, and efficacy of a multidose regimen of CUR61414 (0.09%, 0.35%, 1.1%, and 3.1%) applied topically to human superficial or nodular BCCs for up to 28 days.
Results:
In mice, topical CUR61414 significantly inhibited skin Hh signaling, blocked the induction of hair follicle anagen, and shrank existing BCCs. However, we observed no clinical activity of this formulation in human superficial or nodular BCCs in a phase I clinical study.
Conclusions:
Our data highlight some of the challenges of translating preclinical experience into successful human results for a topical anticancer agent.
Insights
Topical CUR61414 showed preclinical efficacy against basal cell carcinoma (BCC) by inhibiting Hedgehog (Hh) signaling in mice. However, a Phase I clinical study found no significant anti-BCC activity in human subjects.
Area of Science:
- Dermatology
- Oncology
- Molecular Biology
Background:
- Basal cell carcinoma (BCC) development is linked to aberrant Hedgehog (Hh) signaling.
- CUR61414 is an inhibitor of Smoothened, a key molecule in Hh signal transduction.
Purpose of the Study:
- To investigate the topical anti-BCC efficacy of CUR61414.
- To evaluate the safety, tolerability, and efficacy of CUR61414 in preclinical models and human BCCs.
Main Methods:
- Preclinical studies involved a depilatory model and murine BCCs (Ptch1 (+/-) K14-CreER2 p53 fl/fl mice).
- A Phase I clinical study assessed multidose topical CUR61414 (0.09%-3.1%) on human BCCs for up to 28 days.
Main Results:
- Topical CUR61414 inhibited Hh signaling and hair follicle anagen in mice.
- CUR61414 treatment led to shrinkage of existing murine BCCs.
- No clinical activity was observed in human superficial or nodular BCCs during the Phase I study.
Conclusions:
- Translating preclinical findings of topical anticancer agents to human efficacy presents challenges.
- Further research is needed to understand the discrepancies between mouse and human responses to topical CUR61414.
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