Table 2. Characteristics of the ‘pot+’ and ‘pot−’ populations.

	‘Pot−’ group		‘Pot+’ group
Clinical parameters and outcome variables	Nb	% (95% CI)	Nb	% (95% CI)	P
Age
<55 years old	18	30.5% [18.8–43.3]	14	29.2% [16.3–42.0]	0.894
55–65 years old	22	37.3% [24.9–44.6]	20	41.6% [27.7–55.6]
>65 years old	19	32.2% [20.3–44.1]	14	29.2% [16.3–42.0]
Gender
Male	54	91.5% [84.4–98.6]	40	83.3% [72.8–93.9]	0.197
Female	05	08.5% [02.8–18.7]	08	16.7% [07.5–30.2]
Tumour differentiation
Well differentiated	26	44.1% [31.4–56.7]	18	37.5% [23.8–51.2]	0.777
Moderately differentiated	27	45.7% [33.1–58.5]	24	50.0% [35.9–64.1]
Poorly differentiated	06	10.2% [03.8–20.8]	06	12.5% [04.7–25.3]
pT
pT1	22	37.3% [24.9–49.6]	12	25.0% [12.8–37.3]	0.150
pT2	10	17.0% [08.4–29.0]	05	10.4% [03.5–22.7]
pT3	27	45.7% [33.1–58.5]	31	64.6% [51.1–78.1]
pN
N0	41	69.5% [57.7–81.2]	25	52.1% [38.0–66.2]	0.065
N1	18	30.5% [18.8–42.3]	23	47.9% [33.8–62.0]
Vascular invasion
No	45	76.3% [65.4–87.1]	27	56.2% [42.2–70.3]	0.028
Yes	14	23.7% [12.9–34.6]	21	43.8% [29.7–57.8]
Local recurrence
No	45	76.3% [65.4–87.1]	26	54.2% [40.1–68.3]	0.016
Yes	14	23.7% [12.9–34.6]	22	45.8% [31.7–59.9]
Metastasis
No	45	76.3% [65.4–87.1]	11	22.9% [11.0–34.8]	<0.001
Yes	14	23.7% [12.9–34.6]	37	77.1% [65.2–89.0]
Total	59	100%	48	100%

Nb=number of patients, 95% CI=95% confidence interval, P=significance of the difference between ‘pot−’ and ‘pot+’ groups.