Mass during abdominal exploration

56 years old female, represented with intestinal obstruction, she had a previous history of 5 CS and old uterine fibroid. The surgeon found large mass arising from the pelvis infiltrating the intestinal wall. Pelvic organs could not be identified. The OBgyn-Surg. team just made debulking of the mass and release the obstruction. Grossly; many variable sized irregular grayish friable tissue pieces were received. Microscopically; malignant growth formed of spindle cells and rhabdoid cells with high mitotic index and extensive necrosis. I suggested pleomorphic rhabdomyosarcoma (DD: MFH; Pleomorphic liposarcoma). What are ur suggestion and markers recommended?.