COLON AND RECTAL CANCER
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1 COLON AND RECTAL CANCER Mark Sun, MD Clinical Associate Professor of Surgery University of Minnesota No disclosures Objectives 1) Understand the epidemiology, management, and prognosis of colon and rectal cancer 2) Review the pathophysiology of tumor development 3) Introduce surgical considerations in the treatment of colon and rectal cancer Colon and Rectal Cancer Statistics ,250 new cases 8.1% of all cancers 50,630 deaths 4.2% of all men and women will be diagnosed with colon or rectal cancer at some point in their life In 2015: 1,332,085 people living with colon and rectal cancer in the US Colon and rectal cancer costs the US $8.4 billion/yr Overall Incidence Epidemiology In 2018 SEER database AllinaHealthSystems 1
2 Pathogenesis Pathogenesis Signs and Symptoms Staging: TNM Abdominal pain Bloating Nausea/vomiting Blood in the stool Change in bowel habits Unintentional weight loss Weakness or fatigue T-Stage Staging: TNM AllinaHealthSystems 2
3 Staging Colon Cancer Work-up Treatment: Stage I-III Blood work CBC CMP CEA Imaging CT Chest/Abdomen/Pelvis: Rule out metastatic disease!! Locally invasive disease: Consider MRI Metastatic disease: PET scan Surgery Goals Primary Goals Remove the tumor INTACT with adequate margins (minimum 5cm proximal/distal) Adequate lymphadenectomy (minimum 12 nodes) If the tumor is locally invasive, the tumor should be removed EN-BLOC with any other affected organs/structures R0 Resection: 5-yr overall survival 82% R1 Resection: 5-yr overall survival 35% R2 Resection: 5-yr overall survival 0% Secondary Goals Restore intestinal continuity Minimally invasive approach Laparoscopic Robotic Surgery: Vascular Anatomy AllinaHealthSystems 3
4 Surgery: Lymph Node Anatomy Surgery Surgery: Open vs. Laparoscopic COST Trial (N Engl J Med 2004;350: ) Decreased length of stay Less postoperative pain Less intraoperative blood loss Earlier return to work Improved quality of life at 30 days postop Equivalent oncologic outcomes Rectal Cancer <50% of colectomies performed laparoscopically Complex procedure Lack of knowledge among surgeons of increased benefit Difficulty in training surgeons already in practice Rectum: Anatomy Work-up Blood work CBC CMP CEA Imaging CT Chest/Abdomen/Pelvis: Rule out metastatic disease!! Local Staging: Pelvic MRI vs. Endorectal Ultrasound MRI: More sensitive for LN detection, difficult to differentiate T-stage ERUS: Better for differentiating T0/T1/T2 lesions.?accuracy in LN detection. Very technician dependent. Metastatic disease: PET scan AllinaHealthSystems 4
5 Rectal Cancer: History Local Recurrence Rate 1980 s: 30-40% Standard of care: surgery with postoperative radiation Reports of positive pelvic lateral margins in 85% of cases Mid 1980 s Bill Heald: Total Mesorectal Excision (TME) Complete removal of the rectum and rectal mesenteric envelope all the way to the pelvic floor Published Basingstoke experience in 1998: local recurrence rate 3.6% Swedish Trial (1997) Improved overall survival and local recurrence with addition of preoperative chemoradiation Dutch Trial (2001) Compared preop radiation followed by TME vs. TME alone Local recurrence: 2.4% vs. 8.2% German Trial (2004) Compared preop radiation vs. postop radiation Preop group had improved local control with less toxicity and no changes in survival Standard of Care: United States 2016 Stage 1 Surgery TME Low Anterior Resection vs. Abdominoperineal Resection MINIMUM 1cm distal margin Stage 2 or 3 Chemotherapy up front Total Neoadjuvant Treatment (TNT) Preoperative chemoradiation: 50.4 Gy delivered in 28 fractions Surgery TME Low Anterior Resection vs. Abdominoperineal Resection MINIMUM 1cm distal margin Surgery Goals Primary Goals Remove the tumor INTACT with adequate margins (minimum 5cm proximal/distal margin for PME or 1cm distal margin with TME) Adequate lymphadenectomy (minimum 12 nodes) If the tumor is locally invasive, the tumor should be removed EN-BLOC with any other affected organs/structures R0 Resection: 5-yr overall survival 64% R1 Resection: 5-yr overall survival 0% R2 Resection: 5-yr overall survival 0% Secondary Goals Restore intestinal continuity Minimally invasive approach Questionable benefit -> studies at this time do not support laparoscopic or robotic surgery Rectal Cancer: T1N0 lesions Can consider local excision Transanal TEM/TAMIS 82 patients with T1 (n=55) and T2 (n=27) rectal cancer All node negative disease, negative margin resection, moderately differentiated, no lymphovascular invasion 10 of 55 patients with T1 tumors (18%) and 10 of 27 T2 patients (37%) had recurrence by 54 months Average time to recurrence: 18 months 17 of 20 patients underwent salvage surgery 5-yr cancer specific survival T1: 98% T2: 89% Rectal Cancer: Complete Response Habr-Gama 2004 Annals of Surgery: Introduced the idea of complete pathologic response 265 patients with rectal cancer undergo preop chemoradiation 71 patients (26.8%) with complete response 5-yr overall survival/disease-free survival Resection: 88%/83% Observation: 100%/92% 2009 BJS 15-year experience of watch and wait 120 patients Local recurrence rate 11% All amenable to salvage surgery, no change in oncologic outcome AllinaHealthSystems 5
6 Treatment: Stage IV Adjuvant Chemotherapy Chemotherapy first? Surgery first? Primary first? Metastases first? Synchronous resection? Heated intraperitoneal chemotherapy (HIPEC) 5-year Survival 5-year Survival Trends Incidence by Age Incidence by Age AllinaHealthSystems 6
7 Incidence by Age Disease Specific Survival by Stage 40% 40% 20% Early Detection: Screening 30-40% Americans over the age of 50 have not undergone screening for colon and rectal cancer US CRC Screening Rates Screening options (average risk): Colonoscopy (10 years): Gold standard CT Colonography (5 years) Flexible Sigmoidoscopy (5 years) Double Contrast Barium Enema (5 years) FOBT/FIT Testing (1 year) Stool DNA test/cologuard (Unknown) Questions? AllinaHealthSystems 7
COLON AND RECTAL CANCER
No disclosures COLON AND RECTAL CANCER Mark Sun, MD Clinical Assistant Professor of Surgery University of Minnesota Colon and Rectal Cancer Statistics Overall Incidence 2016 134,490 new cases 8.0% of all
Index. Note: Page numbers of article titles are in boldface type.
Note: Page numbers of article titles are in boldface type. A Abdominoperineal excision, of rectal cancer, 93 111 current controversies in, 106 109 extent of perineal dissection and removal of pelvic floor,
Index. Note: Page numbers of article titles are in boldface type.
Index Note: Page numbers of article titles are in boldface type. A Abdominal surgery prior as factor in laparoscopic colorectal surgery, 554 555 Abscess(es) CRC presenting as, 539 540 Adenocarcinoma of
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