CA9 and neoplasm: In parallel, ex vivo staining of tumour sections with monoclonal antibodies specific to CA IX had revealed staining patterns overlapping (though somewhat broader) with the neoplastic regions stained with pimonidazole (Olive et al, 2001; Hoskin et al, 2003; Sobhanifar et al, 2005; Jankovic et al, 2006; Li et al, 2007).