The age threshold of the 8th edition AJCC classification is useful for indicating patients with aggressive papillary thyroid cancer in clinical practice

Table 1 Characteristic of PTC patients. Descriptive data were presented as number of observation (percent) or mean + SD

Variable	Total group (n = 523)
Gender:
Female	456 (87.2)
Male	67 (12.8)
Age at diagnosis (years)	50.00 + 15.38
Age (cutoff 45 years old):
< 45 years	193 (36.9)
> 45 years	330 (63.1)
Age (cutoff 55 years old):
< 55 years	306 (58.5)
> 55 years	217 (41.5)
Diagnosis of thyroid malignancy:
Before surgery	319 (61.0)
After surgery	204 (39.0)
Type of surgery:
Total	381 (72.8)
Partial	142 (27.2)
Reoperation:
No	388 (74.2)
Yes	135 (25.8)
pTNM stage:
I	433 (82.8)
II	67 (12.8)
III	15 (2.9)
IV	8 (1.5)
Tumor stage:
pT1a	208 (39.8)
pT1b	236 (45.1)
pT2	61 (11.7)
pT3	9 (1.7)
pT4a	3 (0.6)
pT4b	6 (1.1)
Lymph node metastasis:
pN0	350 (66.9)
pN1a	145 (27.7)
pN1b	6 (1.1)
pNx	22 (4.2)
Distant metastasis:
pM0	450 (86.0)
pM1	19 (3.6)
pMx	54 (10.4)

ISSN: 1471-2407