Aberrant gene methylation in the peritoneal fluid is a risk factor predicting peritoneal recurrence in gastric cancer

Table 3 Clinicopathological factors of the patients (n = 80)

Clinicopathological factors	n (%)
Gender
Female	28 (35.0)
Male	52 (65.0)
Age (yr)	65.9 ± 10.8
Range	39-88
Histological type
tub	36 (45.0)
por/sig/muc	44 (55.0)
Classification
Group A: M-MP with CY(-) and P(-)	35 (43.8)
Group B: SS-SI with CY(-) and P(-)	31 (38.8)
Group C: CY(+) or P(+)	14 (17.5)
Clinical stage at the sample collection
I	37 (46.3)
II	8 (10.0)
III	18 (22.5)
IV	15 (18.8)
Peritoneal recurrence	2 (2.5)

tub: Tubular adenocarcinoma; por: Poorly differentiated adenocarcinoma; sig: Signet-ring cell carcinoma; muc: Mucinous adenocarcinoma. Tumor invasion of mucosa and/or muscularis mucosa (M), muscularis propia (MP) or subserosa (SS), tumor invasion of adjacent structures (SI). Cancer cells on peritoneal cytology (CY), peritoneal metastasis (P).