Safety and Efficacy of Doses of LEO 43204 Once Daily for Two Consecutive Days on Full Balding Scalp in Subjects With Actinic Keratosis

Safety and Efficacy of Escalating Doses of LEO 43204 Applied Once Daily for Two Consecutive Days on Full Balding Scalp in Subjects With Actinic Keratosis

To identify the Maximum Tolerated Dose levels of LEO 43204 after once daily treatment for two consecutive days and to evaluate efficacy of LEO 43204 in two doses after once daily treatment for two consecutive days compared to vehicle

Inclusion Criteria:

• Part 1: Subjects with 5 to 20 clinically typical, visible and discrete AKs on the full balding scalp.
• Part 2: Subjects with 5 to 20 clinically typical, visible and discrete AKs on the full balding scalp

Exclusion Criteria:

• Location of the treatment area

  • within 5 cm of an incompletely healed wound
  • within 5 cm of a suspected basal cell carcinoma (BCC) or squamous cell carcinoma (SCC)

• Prior treatment with ingenol mebutate gel on the treatment area

• Lesions in the treatment areas that have

  • atypical clinical appearance (e.g., hypertrophic, hyperkeratotic or cutaneous horns) and/or
  • recalcitrant disease (e.g., did not respond to cryotherapy on two previous occasions)