Table 3.

Expression of HOXA10 in correlation to the localisation of the tumour.

Patient Number	Localisation	Expression of HOXA10
C1	Clivus	−
C2	Clivus	−
C3	Clivus	+
C4	Clivus	+
C5	Clivus	+
S1	Sacrum	++
S2	Sacrum	++
S3	Sacrum	+++
S4	Sacrum	+++
S5	Sacrum	+++
S6	Sacrum	+++
S7	Sacrum	+++
S8	Sacrum	+++
S9	Sacrum	++
S10	Sacrum	++
S11	Sacrum	+++
S12	Sacrum	+++
S13	Sacrum	+++
S14	Sacrum	+++
S15	Sacrum	+++
S16	Sacrum	+++
S17	Sacrum	+++
S18	Sacrum	+++
S19	Sacrum	+++
S20	Sacrum	+++
S21	Sacrum	+++
S22	Sacrum	+++
S23	Sacrum	+++
S24	Sacrum	+++

Clivus chordomas (n = 5) have a weaker expression of HOXA10 than sacrum chordomas (n = 24) shown by immunohistochemistry.