Autoradiographic distribution of hematoporphyrin derivative in normal and tumor tissue of the mouse.

The distribution of isotopically labeled hematoporphyrin derivative (HPD) has been studied in mice bearing the spontaneous mammary tumor (fast growing). In stomach, liver, spleen, and pancreas, 3 hr after i.p. injection of [3H]HPD, grains were uniformly distributed over the tissue sections. After 24 hr, the grain density overlying parenchymous areas of these tissues was lower than that over the stromal or reticuloendothelial areas. In the spontaneous mammary tumor (fast growing), higher grain densities were seen over pseudocapsule, stromal septa, and necrotic areas at 3, 6, 12, 24, and 48 hr after injection. At 168 hr postinjection, only isolated stomal cells, presumably macrophages, showed high grain densities. From the temporal changes observed in the distributions of HPD in normal tissues and the relative stability of the distribution seen in the spontaneous mammary tumor (fast growing), we speculate that tissue factors such as vascular permeability, lack of an adequate lymphatic drainage, and nonspecific binding of serum proteins to stromal elements may be responsible for or contribute to the preferential uptake and/or retention of HPD observed in both human and animal tumors.

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