Table 1. Patient characteristics.

	No. of cases	%
Age (years)
<40	16,913	20.9
40–49	22,207	27.5
50–59	17,803	22.0
≥60	23,843	29.5
Stage
Localized	33,609	41.6
Regional	17,757	22.0
Distant	2,786	3.5
Unspecified	26,614	33.0
Year of Diagnosis
1993–1997	21,688	26.9
1998–2002	21,759	26.9
2003–2007	19,222	23.8
2008–2012	18,097	22.4
Primary treatment
Surgery	33,012	40.9
Chemotherapy	6,933	8.6
Radiation	6,395	7.9
Chemoradiation	7,216	8.9
Surgery + adjuvant chemoradiation	4,647	5.8
Others	22,563	27.9
Histology
Squamous cell carcinoma	64,531	79.9
Adenocarcinoma	7,265	9.0
Adenosquamous carcinoma	1,853	2.3
Unspecified	7,117	8.8