Mitsui MWCNT-7 carbon nanotubes with an average width of 100 nm and a length of 1 to 20 μm (median of 2 μm) administered by intraperitoneal injection into heterozygous p53 mice [13,46] and by intrascrotal injection into Fischer 344 rats [47] caused mesotheliomas as well. Here, TP53 is linked to mesothelioma.