Table 1 Clinicopathological characteristics of 77 patients according to the WHO 2017 classification.

From: Molecular classification of follicular thyroid carcinoma based on TERT promoter mutations

Ā 

MI-FTC (n = 39)

EA-FTC (n = 24)

WI-FTC (n = 14)

P for trend

Sex (n, %)

ā€ƒFemale

31 (79.5)

17 (70.8)

11 (78.6)

0.767

ā€ƒMale

8 (20.5)

7 (29.2)

3 (21.4)

Age, year (mean, SD)

40.1 (13.76)

42.1 (18.7)

48.5 (12.2)

0.172*

Size

ā€ƒMean, cm (mean, SD)

3.26 (1.59)

4.08 (1.68)

4.65 (3.37)

0.130*

ā€ƒ4 cm or less

28 (71.8)

14 (58.3)

9 (64.3)

0.444

ā€ƒMore than 4 cm

11 (28.2)

10 (41.7)

5 (35.7)

Gross ETE

ā€ƒAbsent

39 (100.0)

23 (95.8)

12 (85.7)

0.023

ā€ƒPresent

0 (0.0)

1 (4.2)

2 (14.3)

Distant metastasis

ā€ƒAbsent

39 (100.0)

22 (91.7)

8 (57.1)

<0.001

ā€ƒPresent

0 (0.0)

2 (8.3)

6 (42.9)

TERT promoter mutations

ā€ƒWild type

35 (89.7)

19 (79.2)

9 (64.3)

0.033

ā€ƒMutation

4 (10.3)

5 (20.8)

5 (35.7)

AJCC/TNM 8th stage

ā€ƒStage I

39 (100.0)

18 (75.0)

8 (57.1)

<0.001

ā€ƒStage II

0 (0.0)

4 (16.7)

5 (35.7)

ā€ƒStage III/IV

0 (0.0)

2 (8.3)

1 (7.1)

Surgical extent

ā€ƒTotal

16 (41.0)

17 (70.8)

13 (92.9)

<0.001

ā€ƒSubtotal or lobectomy

23 (59.0)

7 (29.2)

1 (7.1)

Cumulative RAI dose

ā€ƒLess than 100 mCi

24 (61.5)

9 (37.5)

1 (7.1)

<0.001

ā€ƒ100 mCi or more

15 (38.5)

15 (62.5)

13 (92.9)

  1. MI-FTC minimally invasive follicular thyroid carcinoma, EA-FTC encapsulated angioinvasive follicular thyroid carcinoma, WI-FTC widely invasive follicular thyroid carcinoma SD standard deviation, ETE extrathyroidal extension, TERT telomerase reverse transcriptase, AJCC/TNM American Joint Committee/tumor-node-metastasis, RAI radioactive iodine, *P for trend for continuous variables was analyzed using Jonckheere-Terpstra test.