<prompt> Not a specific tumor marker is -CD 99HMB 45b- globulinCEA  <response>: Ans is d i.e., CEA Carcinoembryonic antigen CEA is used as tumor marker for colorectal cancer major use, lung cancer, breast cancer and ovarian cancer.It is alsoincreased in non-neoplastic conditions like alcoholic cirrhosis, hepatitis, IBD CD, UC, smoking and pancreatitis.CEA lacks sensitivity as well as specificity, hence cannot be used to confirm the diagnosis.About other optionsCD 99 - specific marker for Ewings sarcomaHMB 45 - specific marker for malignant melanomab - globulin - specific marker for multiple myeloma 