Primary tumor regression speed after radiotherapy and its prognostic significance in nasopharyngeal carcinoma: a retrospective study

Table 3 Prognosis of patients with persistent PT at RT end with and without boost irradiation

Variable	Without boost irradiation (N = 27)	With boost irradiation (N = 85)	HR ^†(95% CI*)	P ^‡
5-yr OS rate	65.5%	63.9%	1.308 (0.622-2.748)	0.477
5-yr FFS rate	73.1%	67.7%	1.267 (0.547-2.934)	0.579
5-yr DMFS rate	84.4%	79.2%	1.350 (0.451-4.039)	0.589
5-yr LRFS rate	87.1%	84.6%	1.170 (0.322-4.252)	0.812

^†HR, Hazard ratios calculated using the unadjusted Cox proportional hazards model; *CI, confidence interval; ^‡ P-values were calculated by the unadjusted log-rank test. PT, Primary tumor; RT, Radiotherapy; OS, Overall survival; FFS, Failure-free survival; DMFS, Distant metastasis-free survival; LRFS, Local relapse-free survival.

ISSN: 1471-2407