Management of Resected Rectal Adenocarcinoma

Initial Staging Evaluation

Complete locoregional staging must be performed by an experienced multidisciplinary team using digital examination, rigid rectoscopy, and endorectal ultrasonography 1
Pelvic CT scan should be considered for extensive disease, and MRI for large, deeply situated tumors 1
Distant spread assessment requires clinical examination, chest X-ray (AP and lateral), abdominal ultrasound, and colonoscopy 1
Measurement of carcinoembryonic antigen (CEA) levels should be considered 1

Primary prognostic factors include: presence/absence of distant metastases, type of rectal surgery performed (curative vs. palliative), extent of bowel wall infiltration, invasion of adjacent organs, and presence/absence of metastatic locoregional nodes 1
Secondary prognostic factors include: presentation with acute bowel obstruction or perforation, venous or lymphatic invasion, local neural involvement, number of nodes examined, and number of metastatic nodes detected 1

For tumors of the lower third of the rectum, excision of the entire mesorectum is essential to reduce the risk of locoregional recurrence 1, 2
A radical resection (abdomino-perineal resection) is usually required for tumors of the lower third of the rectum 1
When performing abdomino-perineal resection, epiplooplasty to fill the perineal wound is recommended to reduce complications 1
Postoperative radiotherapy must be considered if surgical clearance was incomplete or if the tumor was under-staged preoperatively 1
For Dukes C disease (node-positive), postoperative chemotherapy with 5-FU + folinic acid is recommended 3
The minimum recommended postoperative radiation dose is 50 Gy given as external-beam irradiation if indicated 1

If resection was complete with negative nodes and no invasion of perirectal fat, regular follow-up without adjuvant therapy is recommended 3, 4
If resection was microscopically incomplete and/or positive nodes and/or invasion of perirectal fat, external-beam radiotherapy followed by consideration of additional surgery is recommended 3, 4
If evidence of distant metastases, consider simultaneous rectal and hepatic surgery (if hepatectomy involves 3 or fewer segments) or systemic palliative chemotherapy 1, 3

Standard follow-up examinations include: clinical examination, chest X-ray, liver ultrasound, and colonoscopy 4
If the patient had sphincter-preservation surgery, rectoscopy and/or endorectal ultrasonography should be considered 4
Elevated CEA level must be confirmed by repeat testing after a minimum interval of 1 month 4

Inadequate mesorectal excision for tumors of the lower third of the rectum can lead to higher local recurrence rates 1, 2
Failure to consider postoperative radiotherapy when surgical clearance is incomplete or when the tumor was under-staged preoperatively 1
Relying solely on imaging without considering pathological findings for adjuvant therapy decisions 1
Neglecting to monitor CEA levels during follow-up, which can help detect recurrence 4
The management of rectal cancer requires a multidisciplinary approach involving surgeons, oncologists, radiologists, and pathologists to optimize outcomes and quality of life 5