Abstract
CaD2 mammary carcinomas transplanted into the feet of mice were treated with tetrasulfonated phthalocyanine (AlPcS4) and laser light at 680 nm. A light dose of 135 J/cm2 was either given as continuous radiation (15 min) or fractionated with 15 s exposure, 15 s darkness, 15 s exposure and so on for 30 min. The CaD2 tumors were found to respond better to a fractionated exposure than to the same energy given in one exposure. The reason for this is assumed to be a relocalization of the dye upon illumination, seen as a rapid decrease in fluorescence. When the laser light was turned off, the fluorescence returned to almost the initial value.
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