H. Rezzoug et al., PARAMETERS AFFECTING PHOTODYNAMIC ACTIVITY OF FOSCAN(R) OR META-TETRA(HYDROXYPHENYL)CHLORIN (MTHPC) IN-VITRO AND IN-VIVO, Lasers in medical science, 13(2), 1998, pp. 119-125
In vitro photodynamic activity of Foscan(R) or meta-tetra(hydroxypheny
l)chlorin (mTHPC) was approximately five times lower in the presence o
f protein in comparison with serum-free medium. Photocytotoxicity does
not depend on the incubation time of the dye with cells. The in vitro
results are discussed from the point of view of photodynamically acti
ve aggregated species. The photodynamic activity of mTHPC was elevated
in vivo by macroscopic measurement of the necrosis depth after tumora
l resection using an in vivo staining procedure with Evans blue dye. O
nly tumours from treated animals presented measurable necrosis areas,
mostly localised in the surface around the irradiated site with a mean
depth of 3.0 +/- 0.3 mm. The photodynamic activity was found to be si
gnificantly higher when using low irradiance (32 mW/cm(2)) than when u
sing a higher one (160 mW/cm(2)). These results were not related, to i
ntratumoral mTHPC photodestruction analysed by in vivo fluorescence sp
ectral analysis.