Kaplan-Meier analysis and Cox regression analysis results
The results of Kaplan-Meier analysis and multivariate analyses performed
to identified the prognostic factors for PFS are shown in Table
3. Kaplan-Meier analysis indicated that
histopathological subtype (P =
0.01), a positive result of interim PET/CT when using DC-3 ((P = 0.02,
Fig. 1A), a positive result of post-treatment PET/CT when using IHPC
((P<0.01, Fig 1B), DC-3 (P<0.01, Fig 1C) and DC-4
(P<0.01, Fig 1D) were associated with worse PFS. Variables
with P<0.05 in univariate analysis were incorporated into
multivariate Cox regression analysis and the results showed that only
DC-4 was an independent prognostic factor for PFS (P < 0.01,
hazard ratio: 7.82, 95% CI: 2.65–23.05).