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.

Abstract

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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