Table 1.

Patient and tumor characteristics, n (%).

	Michigan (n = 92)	Utrecht (n = 130)
Gender
Male	65 (71)	92 (71)
Female	27 (29)	38 (29)
Age (y)
Median	54	58
Range	20-82	24-99
Tumor site
Larynx	4 (4)	47 (36)
Hypopharynx	4 (4)	2 (2)
Oropharynx	53 (58)	41 (31)
Nasopharynx	4 (4)	12 (9)
Oral cavity	8 (9)	11 (8)
Nasal cavity		6 (5)
Salivary glands	9 (10)	1 (1)
Unknown primary	4 (4)	1 (1)
Other*	6 (7)	9 (7)
Stage (AJCC)
I	2 (2)	12 (9)
II	12 (13)	35 (27)
III	26 (29)	30 (23)
IV	48 (52)	36 (28)
Recurrent/unknown	4 (4)	17 (13)
Radiotherapy
Definitive	49 (53)	85 (65)
Postoperative	43 (47)	45 (35)

^*Other: (Michigan) skin 4 patients and maxillary sinuses 2 patients; (Utrecht) Hodgkin/non-Hodgkin lymphoma 4 patients, skin/lip 3 patients, orbita 1 patient, upper trachea 1 patient.

Abbreviation: AJCC = American Joint Committee on Cancer Staging Manual (sixth edition, 2002).