CD 34 is a tumor marker used for -
Ewings sarcoma
Myofibrosarcoma
Alveolar soft part sarcoma
Inflammatory myofibroblastic tumor
CD34 is found in alveolar soft part sarcoma, pre B-ALL, AML, dermatofibrosarcoma protuberans, GIST, giant cell fibroblastoma, granulocytic sarcoma, Kaposi's sarcoma, liposarcoma, malignant fibrous histiocytoma, MPNST, meningeal hemangiopericytomas, meningiomas, neurofibromas, schwannomas, and papillary thyroid carcinoma.