Table 1:

Patient Characteristics (N = 108). SD = standard deviation. Patients were staged according to the 7th Edition of the American Joint Committee on Cancer Staging Manual.

Age at diagnosis, years
Mean (SD)	58.6 (8.8)
Median (range)	57 (39-84)
Female sex	19 (17.6%)
Smoking history
Never	45 (41.7%)
Former*	32 (29.6%)
Current	31 (28.7%)
Mean pack years (SD)	20.6 (26.9)
Median pack years (range)	10 (0-150)
Primary tumor site
Oropharynx	65 (60.2%)
Oral cavity	16 (14.8%)
Larynx	16 (14.8%)
Hypopharynx	4 (3.7%)
Nasopharynx	3 (2.8%)
Unknown primary	3 (2.8%)
Synchronous oropharynx and larynx	1 (0.9%)
T classification
x	3 (2.8%)
is	1 (0.9%)
1	23 (21.3%)
2	31 (28.7%)
3	14 (13.0%)
4	36 (33.3%)
N classification
0	14 (13.0%)
1	12 (11.1%)
2	59 (54.6%)
3	23 (21.3%)
Group stage
0	1 (0.9%)
I	1 (0.9%)
II	5 (4.6%)
III	12 (11.1%)
IV	89 (82.4%)
Concurrent systemic therapy**
Yes	90 (83.3%)
Head and neck surgery
Prior to RT or within 1 year of RT	34 (31.5%)
Prior to RT with removal of major salivary gland	11 (10.2%)
Within 1 year of RT with removal of major salivary gland	0
Bilateral neck treatment
Yes	98 (90.7%)

^*Former smoking status defined as having quit smoking at least 1 year prior to cancer diagnosis.

^**Concurrent systemic therapy refers to cytotoxic chemotherapy and cetuximab.