Intra-peritoneal (IP) injection is being recommended as a means of assessing potential carcinogenicity of MMF following inhalation. Little is known of the behaviour of fibres in the peritoneal cavity or its relevance to the lung. This study considered both the biopersistence and the distribution of dose following IP injection of fibres. Biopersistence of fibres in the peritoneal cavity has been compared with that observed previously in the lung. Marked differences were found, with long fibres (> 20 microns) being more durable in the peritoneal cavity than in the lung. Breakage could not account for this finding, whereas differences in dissolution could. The behaviour of fibres and powders and their distribution in the peritoneal cavity following injection of different masses is reported. Distribution of dose depended on injection mass, with masses of < 1.5 mg showing even uptake onto the surfaces of the peritoneal organs, and higher masses resulting in the development of nodules of injection material, free in the peritoneal cavity, or loosely bound to the peritoneum. With fine powder, some clearance was observed over the first 48 h after IP injection, but not with fibres. The findings on both durability and distribution of dose following IP injection have implications on the justification for the use of IP injections in assessment of potential carcinogenicity of fibres following inhalation.
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