Classification of rectal cancer according to recurrence types - comparison of Japanese guidelines and Western guidelines

Table 1 Patients’ characteristics

Variable	n (%)
Male	579 (60)
Female	379 (40)
Age	22-93
Median	68
Location of the tumor RC	323 (33.7)
LC	284 (29.6)
R	351 (36.6)
Neoadjuvant CRT Yes	217 (61.8)
No	134 (38.2)
Histological type wel-mod	868 (90.6)
Muc	37 (3.8)
Por or Sig	21 (2.2)
PCR	26 (2.7)
Unknown	6 (0.6)
T factor 0	37 (3.8)
1	40 (4.2)
2	83 (8.6)
3	610 (63.6)
4	188 (19.6)
N factor positive	379 (39.5)
Negative	579 (60.4)
Lymphatic invasion positive	655 (68.3)
Negative	302 (31.5)
Unknown	1 (0.1)
Venous invasion positive	647 (67.5)
Negative	310 (32.3)
Unknown	1 (0.1)
Pathological Stage 0	38 (4)
I	59 (6.1)
II	482 (50.3)
III	379 (39.5)

RC: Right sided colon; LC: Left sided colon; R: Rectum; CRT: Chemoradiotherapy; wel: well differentiated adenocarcinoma; Mod: moderated differentiated adenocarcinoma; muc: mucinous adenocarcinoma; Por: Poorly differentiated adenocarcinoma; Sig: Signet cell adenocarcinoma; PCR: Pathological complete response.