Comparison of efficacy, adverse effects and costs between 20 % ALA-PDT and 10 % ALA-PDT for the treatment of actinic keratosis in Chinese patients

5-aminolevulinic acid (ALA)-mediated photodynamic therapy (PDT) is a reliable treatment for actinic keratosis (AK), though the concentration of 20 % is applied in most ALA-PDT for the treatment of AK, it was found that 10 % ALA could achieve similar outcome during clinical practice. However, there are limited number of reports comparing the efficacy and the safety of ALA-PDT with different ALA doses when treating AK. This study was designed to...