“…Second, we excluded from this study the following chondrosarcoma variants, each with its own distinct demographic, clinical, pathologic, and prognostic profile: dedifferentiated, 8 -10 clear cell, [11][12][13] and mesenchymal 14 -16 chondrosarcoma. Third, chondrosarcomas of the craniofacial bones, ribs, sternum, spine, and small bones of the hands and feet present unique problems in diagnosis and especially in treatment 3,17,18 because of their location, thus precluding meaningful comparison with tumors arising in long bones and the shoulder and pelvic girdles. Finally, we restricted survival analysis to the 233 patients who received their initial treatment at the Mayo Clinic.…”