Comparison of Mechanical Penetration Enhancers on Metvixia Skin Penetration

Spectrofluorometer probe in contact with skin was used to measure surface, deeper skin fluorescence, using different photoactive Protoporphyrin IX (PpIX) excitation wavelengths. Fluorescence measurements were used to estimate quantity of PpIX in skin, corresponding with degree of Metvixia® skin penetration. Three measurements were taken at different locations within each mini-zone at 5 time points: T0 (before Metvixia® application), and 30 minutes,1 hour(hr),2hr, 3hr after Metvixia® application (immediately after cream removal at 3hr time point). Fluorescence data obtained using spectrofluorometer probe for two wavelengths that is, 405 nanometer(nm) measured fluorescence on skin surface, 632nm measured fluorescence in deep skin reported in this outcome measure. Maximal value was used to characterize Peak Effect, time point of this value was used to characterize Time to Peak. Negative values meant there was no longer fluorescence, it was corrected measurement derived from fluorescence.

A spectrofluorometer probe in contact with the skin was used to measure surface, as well as deeper skin fluorescence, using different Protoporphyrin IX (PpIX) excitation wavelengths. Fluorescence measurements were used to estimate the quantity of PpIX in the skin, corresponding with the degree of Metvixia® skin penetration. Three measurements were taken at different locations within each mini-zone at 5 time points: T0 (before Metvixia® application), and 30 minutes, 1 hour, 2 hours and 3 hours after Metvixia® application (immediately after cream removal at the 3 hour time point). Fluorescence data obtained using the spectrofluorometer probe for the two wavelengths that is, 405 nm measured fluorescence on skin surface and 632 nm measured fluorescence in deep skin were reported in this outcome measure. The maximal value was used to characterize the Peak Effect, and the time point of this value was used to characterize the Time to Peak.

A spectrofluorometer probe in contact with the skin was used to measure surface, as well as deeper skin fluorescence, using different Protoporphyrin IX (PpIX) excitation wavelengths. Fluorescence measurements were used to estimate the quantity of PpIX in the skin, corresponding with the degree of Metvixia® skin penetration. Three measurements were taken at different locations within each mini-zone at 5 time points: T0 (before Metvixia® application), and 30 minutes, 1 hour, 2 hours and 3 hours after Metvixia® application (immediately after cream removal at the 3 hour time point). Fluorescence data obtained using the spectrofluorometer probe for the two wavelengths that is, 405 nm measured fluorescence on skin surface and 632 nm measured fluorescence in deep skin were reported in this outcome measure. The maximal value was used to characterize the Peak Effect, and the time point of this value was used to characterize the Time to Peak.

A spectrofluorometer probe in contact with the skin was used to measure surface, as well as deeper skin fluorescence, using different Protoporphyrin IX (PpIX) excitation wavelengths. Fluorescence measurements were used to estimate the quantity of PpIX in the skin, corresponding with the degree of Metvixia® skin penetration. Three measurements were taken at different locations within each mini-zone at 5 time points: T0 (before Metvixia® application), and 30 minutes, 1 hour, 2 hours and 3 hours after Metvixia® application (immediately after cream removal at the 3 hour time point). Fluorescence data obtained using the spectrofluorometer probe for the two wavelengths that is, 405 nm measured fluorescence on skin surface and 632 nm measured fluorescence in deep skin were reported in this outcome measure. The maximal value was used to characterize the Peak Effect, and the time point of this value was used to characterize the Time to Peak.

A spectrofluorometer probe in contact with the skin was used to measure surface, as well as deeper skin fluorescence, using different Protoporphyrin IX (PpIX) excitation wavelengths. Fluorescence measurements were used to estimate the quantity of PpIX in the skin, corresponding with the degree of Metvixia® skin penetration. Three measurements were taken at different locations within each mini-zone at 5 time points: T0 (before Metvixia® application), and 30 minutes, 1 hour, 2 hours and 3 hours after Metvixia® application (immediately after cream removal at the 3 hour time point). Fluorescence data obtained using the spectrofluorometer probe for the two wavelengths that is, 405 nm measured fluorescence on skin surface and 632 nm measured fluorescence in deep skin were reported in this outcome measure. The maximal value was used to characterize the Peak Effect, and the time point of this value was used to characterize the Time to Peak.

A mini-zone camera device was used to measure skin surface fluorescence at a single excitation wavelength 405 nm before, and after Metvixia® application. Fluorescence measurements were used to estimate the quantity of PpIX in the skin, corresponding with the degree of Metvixia® skin penetration. This device uses the classical excitation wavelength: 405nm, was designed for Actinic Keratoses (AK) and had fluorescence references included. Pictures were performed for each zone before pre-treatment and after cream removal at visit 2 (V2) for documentation of fluorescence.

TEWL evaluated the efficiency of the skin water barrier, which correlates with the degree of damage to the barrier function of the stratum corneum. TEWL was assessed on the mini-zones that were not treated with Metvixia®. It was measured in Grams of Water Per Square Meter Per Hour (g/m^2/hr).