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Abstract— For a variety of chemically defined, synthetic and natural porphyrins, the tendency for self aggregation, binding to serum albumin, distribution coefficient betweenoctanol–1 and water and uptake in V79 Chinese hamster cells have been determined. A strong correlation was found between cell uptake and distribution into octanol. None of the other factors could be correlated with cell uptake. These observations might have an impact on the use of porphyrins in photodynamic and boron neutron capture therapy of tumors.