Treatment Approach for Low Anterior Resection in Rectal Cancer

Preoperative Assessment and Staging

The European Society for Medical Oncology recommends a complete clinical evaluation including rectal examination, rigid proctoscopy with biopsy, complete blood count, liver and renal function tests, CEA, and imaging (chest X-ray, CT/MRI/ultrasound of liver) for patients with rectal cancer 1, 2
Endoscopic ultrasound or rectal MRI is recommended to select patients for preoperative treatment, according to the European Society for Medical Oncology 1, 2
Complete colonoscopy should be performed either pre- or postoperatively, as recommended by the European Society for Medical Oncology 1, 2

Preoperative radiotherapy (e.g., 25 Gy, 5 Gy/fraction followed by immediate surgery) reduces local recurrence rate, as stated by the European Society for Medical Oncology 3, 1
Preoperative chemoradiotherapy (50 Gy, 2 Gy/d + 5-FU continuous infusion during the first and fifth week) is preferred over postoperative chemoradiotherapy due to decreased toxicity, according to the European Society for Medical Oncology 3, 1
Surgery should be performed 6-8 weeks after completion of chemoradiotherapy, as recommended by the European Society for Medical Oncology 3, 1

For lesions in the mid to upper rectum, low anterior resection is the treatment of choice, according to the National Comprehensive Cancer Network 4, 5
For low rectal lesions, either abdominoperineal resection or coloanal anastomosis is required, as stated by the National Comprehensive Cancer Network 4, 5
For small tumors (T1-T2) within 8 cm of the anal verge and limited to 30% of the rectal circumference, transanal excision may be considered, according to the National Comprehensive Cancer Network 4, 5

Total mesorectal excision technique is strongly recommended as it gives a low local recurrence rate (<10%), as stated by the European Society for Medical Oncology 3, 2
At least 12 lymph nodes should be examined for proper staging, according to the European Society for Medical Oncology 1, 2

Postoperative radiotherapy (50 Gy, 1.8-2.0 Gy/fraction) with concomitant 5-FU based chemotherapy is recommended in patients with positive circumferential margins, perforation in the tumor area, or other high-risk features if preoperative radiotherapy has not been given, as recommended by the European Society for Medical Oncology 3, 2
Adjuvant chemotherapy can be provided for patients with stage III (and 'high-risk' stage II) rectal cancer, though scientific support for sufficient effect is less robust, according to the European Society for Medical Oncology 6

For fixed tumors or local recurrence (if radiotherapy was not given initially), preoperative radiotherapy with or without concomitant chemotherapy should be administered, as recommended by the European Society for Medical Oncology 3, 2
Attempts at radical surgery should take place 4-8 weeks after radiotherapy, according to the European Society for Medical Oncology 3, 2
For disseminated disease, treatment may include surgery of resectable liver or lung metastases in selected cases, as stated by the European Society for Medical Oncology 3, 2

History and rectosigmoidoscopy every 6 months for 2 years, as recommended by the European Society for Medical Oncology 3, 2
History and colonoscopy with resection of colonic polyps every 5 years, according to the European Society for Medical Oncology 3, 2
Clinical, laboratory, and radiological examinations should be restricted to patients with suspicious symptoms, as recommended by the European Society for Medical Oncology 3, 2

The European Society for Medical Oncology recommends complete blood count as part of the standard clinical evaluation, although specific guidelines for low anterior resection do not mandate routine FBC removal or monitoring as a standalone perioperative measure 7, 8, 9

Optimization of hemodynamic control and peripheral oxygenation intraoperatively is recommended as part of standard anesthetic protocol to attenuate surgical stress response 7, 8
Targeted fluid therapy using oesophageal Doppler to optimize cardiac output and avoid overhydration is suggested with moderate evidence and strong recommendation 7, 8
Prevention of intraoperative hypothermia with temperature monitoring is advised, as hypothermia increases perioperative complications 7
Consider iron supplementation or transfusion if hemoglobin is significantly low before surgery to reduce anastomotic leak risk 7
FBC monitoring frequency should be guided by clinical status, operative blood loss, and presence of complications in the postoperative phase 7
The ERAS protocol suggests routine daily FBC draws may not be necessary in uncomplicated cases, with an emphasis on early mobilization and discharge 9

Pelvic drains should not be used routinely after low anterior resection, according to the ERAS guidelines with low evidence and weak recommendation 7, 8
Transurethral catheters can be safely removed on postoperative day 1 after pelvic surgery with low risk of urinary retention, even with epidural analgesia 7, 8