The Efficacy and Tolerability of Oleogel-S-10 in Patients With Actinic Keratoses

Inclusion Criteria:

* At least two mild to moderate actinic keratoses located at the facial skin or the head (except lips)
* Actinic keratoses with a diameter of 0,5 - 2 cm,

  * that are definitely distinguished from other lesions and display a minimum distance of 0,5 cm to neighbored lesions
  * that are evaluated as histopathological grade 1 to 3
* histologically proven AK within three months before study entry
* prepared and able to give written informed consent
* ≥ 18 years of age
* In case of females: postmenopause defined as

  * natural menopause with menses \> 1 year ago
  * serum FSH (\> 20 IU/l) and E2 levels in the postmenopausal range or
  * patients who had bilateral oophorectomy
* prepared and comply with all study requirements, including the following:

  * application of Oleogel-S10 on the treatment area once or twice a day
  * 4 clinic visits during the pre-study, treatment, post-treatment, and follow-up period
  * pre- and post-treatment biopsy for histological confirmation (of clearance) of AK-diagnosis
* Representative histologic slide and tissue block were shipped

Exclusion Criteria:

* Active immunosuppressive therapy
* data of clinically significant, unstable, cardiovascular or hematologic, hepatic, neurologic, renal, endocrine, collagen-vascular, or gastrointestinal abnormalities or diseases Note: Patients with clinically stable medical conditions including, but not limited to, controlled hypertension, diabetes mellitus type II, hypercholesterolemia, or osteoarthritis will be allowed to enter the study
* known allergies to any excipient in the study drug
* any dermatological disease and/or condition in the treatment or surrounding area (3 cm distances from treatment area) that may be exacerbated by treatment with Oleogel-S-10 or cause difficulty with examination
* active chemical dependency or alcoholism, as assessed by the investigator
* pregnant and lactating women
* currently participating in another clinical study or have completed another clinical study with an investigational drug within the past 30 days
* received topical treatment at the treatment area with diclofenac gel, imiquimod or 5-FU within a time period of 1 month
* Concomitant existence of non-treated (non-excised) basal cell carcinoma, squamous cell carcinoma or malignant melanoma
* Invasive tumors within the treatment area, e.g.: merkel cell carcinoma, squamous cell carcinoma, basal cell carcinoma, the latter is accepted if completely surgically removed Note: A biopsy of any lesion within the treatment or surrounding area suggestive of malignancy should be performed at the pre-study screening visit. If invasive SCC or other malignant conditions are confirmed within the treatment area, the patient will not be included in the study.