One investigation, a comparative study between WT1 IHC antibodies, used the newer clone WT49 and the conventional clone 6F-H2 to stain 40 malignant pleural mesotheliomas, 55 lung carcinomas and 10 intrathoracic synovial sarcomas [161], and their results corroborate with ours. Here, WT1 is linked to synovial sarcoma.