It is used as an aid in the diagnosis of connective tissue proliferative small round cell tumors;

Pro-connective tissue proliferative small round cell tumors primarily involve children and adolescents, with an age of onset of 10-50 years, a peak age of 30 years, and a male predominance. It is a class of fast-progressing, highly aggressive and highly malignant tumors, occurring mostly in young males. It can involve the peritoneum and has a poor prognosis;

It is mainly differentiated from metastatic small cell carcinoma, malignant mesothelioma, and Ewing's sarcoma;