Table 2.

Kaplan‐Meier analysis for overall survival

Variable	5‐year overall survival rate	P‐value
Age at RT, years		0.321
<70	14%
≥70	42%
Patient sex		0.214
Female	29%
Male	22%
Histology		0.031
SCC	43%
Other	8%
Stage		0.023
I/II	50%
III	17%
Chemotherapy		0.077
No	40%
Yes	19%
RT type		0.982
Proton	29%
Photon	20%
IgG response		0.799
Absent	32%
Present	14%
IgM response		0.194
Absent	38%
Present	15%
IgG or IgM response		0.303
Absent	40%
Present	19%

RT, radiation therapy; SCC, squamous cell carcinoma.