Another study by Tsuji et al., discovered that 108 out of 112 (96%) mesotheliomas, including biphasic and epithelioid had positive membrane staining, whereas none of the 98 pulmonary carcinomas reacted to the SKM9-2 antigen (monoclonal antibody against sialylated HEG1) (9). Here, HEG1 is linked to mesothelioma.