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. 2020 May 25;13:4649–4663. doi: 10.2147/OTT.S252990

Table 3.

Copy Number Loss of PTEN and CDKN2A and Immunoreactive Scores in Chordomas

Copy Number Variation Conventional Chordoma (n=26) Chondroid Chordoma (n=16) Statistical Value (Chi-Square or t value) P value
PTEN
 Intact (n) 8 (30.8%) 9 (56.3%) 3.051a 0.218
 Heterozygous loss (n) 15 (57.7%) 5 (31.2%)
 Homozygous loss (n) 3 (11.5%) 2 (12.5%)
CDKN2A
 Intact (n) 10 (38.5%) 4 (25.0%) 0.973a 0.615
 Heterozygous loss (n) 13 (50.0%) 9 (56.3%)
 Homozygous loss (n) 3 (11.5%%) 3 (18.7%)
PTEN immunoreactive score (mean ± SD) 6.85 ± 3.82 7.75 ± 4.19 0.718b 0.477
CDKN2A immunoreactive score (mean ± SD) 7.46 ± 3.73 6.44 ± 4.58 0.792b 0.433

Notes: aChi-square test; bIndependent-sample t test.