Athenex Announces Phase II Clinical Study Results for KX2-391 Ointment for the Treatment of Actinic Keratosis in the American Academy of Dermatology Meeting
Actinic keratosis is a common skin condition that is induced through ultra-violet light damage, resulting in patches of thick, scaly or crusty skin. Left untreated, the lesions have risk of progression to squamous cell carcinoma and consequently treatment by a dermatologist is recommended. Actinic keratosis is the most common pre-cancerous condition in dermatology and affects more than 55 million Americans. Actinic keratosis constitutes between 14-29% of dermatologist visits in the
KX2-391, also known as KX-01, is a first-in-class dual Src kinase and tubulin polymerization inhibitor being developed as a topical medicinal product for the treatment of actinic keratosis.
This Phase II clinical study aims to determine the activity, safety and pharmacokinetics of KX2-391 ointment 1% (5 days or 3 days) in adults with actinic keratosis on the face or scalp. This is an open-label, multicenter study conducted in adults who had 4-8 actinic keratosis lesions within a 25 cm2 area on the face or scalp. A cohort of subjects was given once daily application for 5 days and was assessed through Day 57 for actinic keratosis lesion counts, local skin reactions (LSRs), and adverse events (AEs). LSRs were scored on a scale of 0 to 4 (worst). A second cohort of 3-day treatment was enrolled after the 5-day treatment regimen demonstrated activity and safety.
A total of 168 patients were recruited (84 for each cohort) from 16 US clinical sites. Subjects were mostly white males, with a mean age of 68 years, skin type I to III and median baseline number of actinic keratosis lesions of 6 for the 5-day treatment cohort and 5 for the 3-day treatment cohort. The 5-day treatment cohort achieved a higher overall 100 percent clearance of actinic keratosis lesions at Day-57 (i.e. 8 weeks after the initiation of treatment) than the 3-day treatment cohort (43% vs. 32%). In the 5-day treatment cohort, 23 of 44 subjects (52%) with actinic keratosis on face and 13 of 40 (33%) on scalp attained 100 percent clearance at Day-57. LSRs were mild and mostly erythema, flaking/scaling, crusting and swelling with the majority of the LSRs scores of <2 and resolved rapidly. Only one subject scored 4 in erythema and flaking/scaling, which both resolved rapidly without concomitant medications. Erosions/ulcers and vesicles/pustules were observed in only 15% and 5% of subjects, respectively. No subjects scored ≥3 in erosions/ulcers/vesicles/pustules. Treatment related AEs were few and predominately mild transient application site pruritus, tenderness and pain. There were no treatment related serious AEs or discontinuations. Plasma levels of KX2-391 were low to undetectable.
As previously announced on
- E. Stockfleth et al. Physician perceptions and experience of current treatment in actinic keratosis. JEADV 2015, 29, 298–306
Founded in 2003, Athenex, Inc. is a global clinical stage biopharmaceutical company dedicated to becoming a leader in the discovery and development of next generation drugs for the treatment of cancer. Athenex is organized around three platforms, including an Oncology Innovation Platform, a Commercial Platform and a Global Supply Chain Platform. Athenex’s Oncology Innovation Platform generates clinical candidates through an extensive understanding of kinases, including novel binding sites and human absorption biology, as well as through the application of Athenex’s proprietary research and selection processes in the lab. The Company’s current clinical pipeline is derived from two different platform technologies Athenex calls Orascovery and Src Kinase Inhibition. The Orascovery platform is based on the novel oral P-glycoprotein pump inhibitor molecule HM30181A, through which Athenex is able to facilitate oral absorption of traditional cytotoxics, which Athenex believes may offer improved patient tolerability and efficacy as compared to IV administration of the same cytotoxics. The Orascovery platform was developed by Hanmi Pharmaceuticals and licensed exclusively to Athenex for all major worldwide territories except Korea, which is retained by Hanmi. The Src Kinase Inhibition platform refers to novel small molecule compounds that have multiple mechanisms of action, including the inhibition of the activity of Src Kinase and the inhibition of tubulin polymerization during cell division. Athenex believes the combination of these mechanisms of action provides a broader range of anti-cancer activity as compared to either mechanism of action alone. Athenex’s employees worldwide are dedicated to improving the lives of cancer patients by creating more active and tolerable treatments. Athenex has offices in Buffalo and Clarence, New York; Cranford, New Jersey; Houston, Texas; Chicago, Illinois; Hong Kong; Taipei, Taiwan and multiple locations in Chongqing,
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