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Table 1 Patient baseline characteristics (n = 52)

From: Early post-treatment 18F-FDG PET/CT for predicting radiation-induced hypothyroidism in head and neck cancer

Characteristic

Value

Age (years), median (IQR)

52.6 (46.3–60.2)

Sex, n (%)

 

 Male

39 (75)

 Female

13 (25)

Diagnosis, n (%)

 

 Nasopharyngeal cancer

44 (84.6)

 Oropharyngeal cancer

8 (15.4)

Clinical T classification, n (%)

 

 T1

6 (11.5)

 T2

14 (26.9)

 T3

12 (23.1)

 T4

20 (38.5)

Clinical N classification, n (%)

 

 N0

1 (1.9)

 N1

9 (17.3)

 N2

30 (57.7)

 N3

12 (23.1)

Prescribed radiotherapy dose (Gy), median (IQR)

72 (70–74)

Pretreatment thyroid volume (cm3), mean (SD)

15.4 (6.5)

Thyroid dose (Gy), median (IQR)

44.1 (37.4–50.4)

Pituitary dose (Gy), median (IQR)

50.3 (23.6–65.1)

Time from end of radiotherapy to PET (days), median (IQR)

93 (77–112)

RIHT, n (%)

 

 Yes

20 (42)

 No

30 (58)

Time from end of radiotherapy to RIHT (months), median (IQR)

22.7 (16.4–25.2)

  1. Abbreviations: IQR, interquartile range; SD, standard deviation; PET, positron emission tomography; RIHT, radiotherapy-induced hypothyroidism