Table 1.

Characteristics of Patients with a First Primary Thyroid Cancer and a Second Primary Cancer, SEER 1973–2008

	First primary		Second primary
	N (52,103)	%	n (4457)	%
Sex
Male	12,875	24.71%	1518	34.06%
Female	39,228	75.29%	2939	65.94%
Race/ethnicity
Black	2932	5.63%	272	6.10%
White	43,045	82.62%	3799	85.24%
Other	5717	10.97%	384	8.62%
Unknown	409	0.78%	2	0.04%
Age at diagnosis (years)
<40	19,539	37.50%	794	17.81%
40–49	11,653	22.37%	959	21.52%
50–59	9408	18.06%	1085	24.34%
60–69	6211	11.92%	1009	22.64%
70+	5292	10.16%	610	13.69%
Year of diagnosis
1973–1983	8978	17.23%	1612	36.17%
1984–1993	10,983	21.08%	1375	30.85%
1994–2003	17,745	34.06%	1192	26.74%
2004–2008	14,397	27.63%	278	6.24%
Histology
Papillary	41,989	83.66%	—	—
Follicular	6438	12.83%	—	—
Medullary	1314	2.62%	—	—
Anaplastic/other	450	0.90%	—	—
Tumor size
0–10 mm	11,356	21.80%	672	15.08%
11–20 mm	9981	19.16%	501	11.24%
21–50 mm	11,018	21.15%	624	14.00%
>51 mm	6737	12.93%	493	11.06%
N/A	13,011	24.97%	2167	48.62%
Radiation treatment
None	29,376	58.39%	2814	63.35%
Beam radiation	2019	4.01%	201	4.52%
Isotopes	16,602	33.00%	934	21.03%
Radiation, NOS	130	0.26%	423	9.52%
Other	2182	4.34%	70	1.58%

N/A, not available; NOS, not otherwise specified.