Study: NCT04364373

Intervention type: PROCEDURE
Group type: EXPERIMENTAL
Intervention: Left colon resection
Description: This procedure is performed for tumours in splenic flexure and proximal and descending colon.~Left colic artery is divided at its origin. Sigmoid arteries and superior rectal arteries are preserved. Inferior mesenteric vein is divided at the lower border of the pancreas. The colon is divided about 10 cm proximal and distal to the tumour. Mesocolic fascia is preserved and the length of the vessel trunk of the mesocolon corresponds to the level of lymph node dissection. After removal of the resected colonic segment a handsewn or stapler end-to-end or side-to-side colonic anastomosis is performed.

Intervention type: PROCEDURE
Group type: ACTIVE_COMPARATOR
Intervention: Sigmoid colon resection
Description: This procedure is performed for tumours in sigmoid colon. Corresponding sigmoid arteries are divided at their origin. Left colic artery and superior rectal artery are preserved. Inferior mesenteric vein is divide close to the left colic artery. Proximal and distal margin compose 10 cm from the tumour. Mesocolic fascia is preserved and the length of the vessel trunk of the mesocolon corresponds to the level of lymph nodes dissection. After removal of the resected colonic segment a handsewn end-to-end or side-to-side or stapler colonic anastomosis is performed.

Intervention type: PROCEDURE
Group type: EXPERIMENTAL
Intervention: Sigmoid colon resection
Description: This procedure is performed for tumours in sigmoid colon. Corresponding sigmoid arteries are divided at their origin. Left colic artery and superior rectal artery are preserved. Inferior mesenteric vein is divide close to the left colic artery. Proximal and distal margin compose 10 cm from the tumour. Mesocolic fascia is preserved and the length of the vessel trunk of the mesocolon corresponds to the level of lymph nodes dissection. After removal of the resected colonic segment a handsewn end-to-end or side-to-side or stapler colonic anastomosis is performed.

Intervention type: PROCEDURE
Group type: ACTIVE_COMPARATOR
Intervention: Distal sigmoid colon resection or anterior resection
Description: This procedure is performed for tumours in distal sigmoid colon or rectosigmoid junction. Superior rectal artery is divided below the origin of left colic artery. Left colic artery is preserved. Inferior mesenteric vein is divide close to the left colic artery. The colon is divided about 10 cm proximal and 5 cm distal to the tumour. Mesocolic fascia is preserved and the length of the vessel trunk of the mesocolon corresponds to the level of lymph node dissection. After removal of the resected colonic segment handsewn or stapler colo-rectal anastomosis is performed.

Intervention type: PROCEDURE
Group type: EXPERIMENTAL
Intervention: Distal sigmoid colon resection or anterior resection
Description: This procedure is performed for tumours in distal sigmoid colon or rectosigmoid junction. Superior rectal artery is divided below the origin of left colic artery. Left colic artery is preserved. Inferior mesenteric vein is divide close to the left colic artery. The colon is divided about 10 cm proximal and 5 cm distal to the tumour. Mesocolic fascia is preserved and the length of the vessel trunk of the mesocolon corresponds to the level of lymph node dissection. After removal of the resected colonic segment handsewn or stapler colo-rectal anastomosis is performed.