Table 2.

Clinical and pathological data collected from the T-REX study

Clinical and pathological data

Patient characteristics  − Age and sex  − Height and body weight  − Tumor location

Surgery-related factors  − Year and month of surgery  − Operation type (open/laparoscopic)  − Intraoperative marking method (under direct vision/laparoscopic)  − Length of the bowel resected (proximal/distal to the tumor)  − Level of central radicality (Fig. 2)  − Operation time and blood loss  − Morbidity (Clavien–Dindo grade) and 30-day mortality

Feeding artery information  − Name of first and second feeding arteries  − Location of first and second feeding arteries (distal/proximal/within the tumor area)  − Distance from the primary tumor (cm) (Fig. 3)  − Pattern of feeding artery distribution (Fig. 4)

Pathological information  − Timing of lymph node retrieval (before fixation/after fixation)  − pT stage  − Tumor grade  − Residual tumor (R0/R1)  − Circumferential resection margin  − Number of lymph nodes retrieved and involved     (a) Pericolic lymph nodes according to the 5 cm interval (Fig. 5)     (b) Intermediate lymph nodes (around first feeding artery/around other feeding arteries)     (c) Main lymph nodes

Postoperative treatment  − Adjuvant chemotherapy

Prognostic outcomes  − Year and month of final follow-up  − Prognostic outcomes and cause of death  − Year and month of recurrence  − Recurrence site   (remnant mesenteric lymph nodes/anastomosis/liver/lung/peritoneum/non-mesenteric   lymph nodes/other)

Other   Photographs of resected specimen (Fig. 6)