Table 2.

Tumour-infiltrating leucocyte antigen expression

	CD45	CD68	CD14	CD3	CD20	DC-SIGN	Mast cella tryptase
Giant cell tumour of bone	Dense	+++	++	+	–	+	+/++
Osteosarcoma; Undifferentiated pleomorphic sarcoma dedifferentiated chondrosarcoma	Moderate	++	+/++	+	–	+	+/++
Ewing sarcoma Chondrosarcoma Chordoma	Sparse	+/++	+/++	−/+	–	−/+	+/++

Inter/intra-tumour variability of leucocyte antigen expression noted. For details, see “Results” section

^aMast cells (+/++) were identified at the periphery of all osteolytic bone tumours