Table 2. Patient characteristics at reirradiation and survival analysis.

Variables	Number of patients [%]	Survival at 6 months (%)	Survival at 12 months (%)	P value (univariate analysis)	P value (multivariate analysis)
Age at Re-RT, years
≤65	18 [55]	50	25
>65	15 [45]	58	43	0.497
Gender
Female	21 [64]	67	48
Male	12 [36]	45	25	0.2
Time interval between end of first RT and second RT, months
≤6	4 [12]	50	0
>6	29 [88]	54	38	0.104
KPS at Re-RT
50–70%	11 [33]	21	21
80–100%	19 [58]	68	47	0.016	0.091
Extrathoracic disease at Re-RT
Yes	6 [18]	0	0
No	27 [82]	66	41	0.001	0.003
Radiation dose (EQD2) of Re-RT, Gy
20–40	24 [73]	40	25
>40	9 [27]	89	56	0.019	0.287
Concurrent chemotherapy
Yes	4 [12]	100	100
No	29 [88]	45	24	0.085
Cumulative dose of first RT plus Re-RT (EQD2), Gy
≤90	17 [52]	41	23
>90	16 [48]	67	45	0.019	0.729
Chemotherapy after Re-RT
Yes	7 [21]	100	43
No	26 [79]	40	27	0.187