CD44 and neoplasm: Finally, CD44 protein expression was significantly associated with PFS (HR: 1.01, 95%CI: 1.00–1.01; p = 0.007); this association did not remain significant when a median cut-off was used (i.e., high versus low; p = 0.102).Regarding OS, platinum-resistance(HR: 4.03, 95%CI: 2.43–6.68; p < 0.001) and residual tumor after primary surgery (HR: 1.72, 95%CI: 1.07–2.75; p = 0.024) were significantly associated with OS, but OS was not associated with older age (p = 0.077), histology (p = 0.070), poor differentiation (p = 0.073), or advanced stage (III–IV; p = 0.084) (Table 3).