Joel A. Ricci, MD SUNY Downstate Medical Center Department of Surgery

Transcription

1 Joel A. Ricci, MD SUNY Downstate Medical Center Department of Surgery

2 Norman Barrett (1950) described the esophagus as: that part of the foregut, distal to the cricopharyngeal sphincter, which is lined by squamous epithelium Columnar lining due to congenital shortening Tubular portion of stomach trapped in the chest Allison/Johnstone (1953) & Lortat-Jacob (1957) Columnar epithelium-lined esophagus Ulcers in this area: Barrett s ulcers Ultimatately l named Barrett s esophagus

3 Change in distal esophageal epithelium Any length Recognized as columnar mucosa on EGD Confirmation of intestinal metaplasia Multiple biopsies Pre-malignant lesion for adenocarcinoma 1. Sharma P, McQuaid KR, Dent J, et al. A critical review of the diagnosis and management of Barrett s esophagus: the AGA Chicago workshop. Gastroenterology 2004;127: Wang KK, Sampliner RE. Updated Guidelines 2008 for the Diagnosis, Surveillance and Therapy of Barrett s Esophagus. Am J Gastroenterol 2008;103:

4 Gastric fundus: resembles stomach epithelium Junctional: resembles cardiac epithelium Intestinal: glandular l epithelium characterized by the goblet cell

5 Squamocolumnar junction Juxtaposition of pale squamous epithelium and red columnar epithelium Z-line Gastroesophageal junction Esophagus ends and Stomach begins Most proximal part of the gastric folds When Z-line above GE junction = Barrett s

6 1. Spechler SJ. Barrett s Esophagus. N Engl J Med 2002;346(11):

7 Metaplastic process at GE junction Squamous to columnar conversion Exposure to exceed acid Prolapse of esophageal mucosa into gastric milieu Inflammatory changes Loss of muscle function Mechanically defective sphincter Free reflux w/ higher degrees of mucosal injury Acid and Bile reflux

8 Chronic GERD = Barrett s in 5% to 15% pts Unclear: Severe esophagitis w/o BE Relative symptoms with severe dysplasia Genetic predisposition? Barrett s gene remains elusive Hereditary pattern: BE occurs in family ygroups more often Low penetrance (no 1 st degree relative correlation) 1. Csendes A, et al. Prevalence of Barrett s esophagus by endoscopy and histologic studies: a prospective evaluation of 306 control subjects and 376 patients with symptoms of gastroesophageal reflux. Dis Esophagus 2000;13: Romero Y, et al. Barrett s esophagus: prevalence in symptomatic relatives. Am J Gastroenterol 2002;97:

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10 Intestinal metaplasia Goblet cells = mucous producing cells Alcian blue stain differentiates from normal stomach tissue

11 15 to 25% if low-grade dysplasia included 5 to 10% if only high-grade h dysplasia Histologic examination 4 categories: No dysplasia Indefinite Low grade dysplasia High grade dysplasia Non-dysplastic: 5 to 10% per year progress to dysplasia 1. Reid et al. Gastroenterology 102:1212, 1992

12 Advanced neoplasia confined to epithelium Limited by basement membrane Not found in lamina propria No regression Precursor and marker for invasive cancer Dx: Esophagoscopy and biopsy Histopathologic Interpretation: Establishing presence of dysplasia Grading dysplastic changes Distinguishing HGD from invasive cancer

13 Reid et al: 5yr probability of cancer 59% if HGD on initial EGD 31% if HGD on surveillance EGD Buttar et al: 3yr probability of cancer 56% if multifocal HGD (> 5 crypts) 14% if focal HGD (< crypts) Cleveland Clinic: Esophagectomy for HGD Invasive cancer present in 45% pts final pathology 1. Reid BJ, et al. Optimizing endoscopic biopsy detection of early cancers in Barrett s high-grade grade dysplasia. Am J Gastroenterol 2000;95: Buttar NS, et al. Extent of high-grade dysplasia in Barrett s esophagus correlates with risk of adenocarcinoma. Gastroenterology 2001;120:

14 Incidence 300% to 500% last 40 yrs 40% in asymptomatic patients (no GERD) Unpredictable Barrett s lifetime Cancer risk as function of duration of Barrett s Annual incidence of malignant transformation 05%to10% 0.5% 1.0% OR 125 x greater than gen. population p

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16 Remains controversial Inability to predict BE prior to endoscopy Invasiveness & expense of EGD Increasing asymptomatic population Not enough evidence for recommendation Prevention of a very rare malignancy 7,000 EAC cases in US % asymptomatic Age of onset > 70yrs High chance of missed lesions on EGD

17 1. Shaheen N, Ransohoff DF. Gastroesophageal reflux, barrett esophagus, and esophageal cancer: scientific review. JAMA 2002;287:

18 Proposed predictors: Male gender Age > 40 yrs Obesity Heartburn Long duration GERD (> 13 yrs) Early recognition warrants early surveillance Life expectancy of EAC pts: Longer if dx by screening EGD rather than at onset of symptoms Not yet recommended

19 Non-dysplastic & Low grade dysplasia Highly effective Medical & Surgical Rx Medical = Proton Pump Inhibitors 1 st line agents for esophagitis Reduced incidence of dysplasia Surgical = Antireflux surgery Nissen, Dor, Toupet Fundoplications Long term relief of symptoms Regression of dysplasia and intestinal i metaplasia Prevention of HGD and adenocarcinoma

20 1. El Serag HB, et al. Proton pump inhibitors are associated with reduced incidence of dysplasia in Barrett s esophagus. Am J Gastroenterol 2004;99:

21 Hofstetter et al: 85 pts w/be at 5 yrs after surgery 80% asymptomatic and 20% recurrence of reflux 81% normal post-op 24hr ph monitoring DeMeester et al: 37 pts with 73% loss of intestinal metaplasia Gurski et al: 77 surgical pts & 14 medical pts Low grade dysplasia regression: 36.8% and 7% Low grade to non-dysplastic: 68% Eight pts progressed (all with long segment BE) Median time of biopsy proved regression: 18.5 months Regression is dependent on length of BE segment and time of f/u after surgery

22 LOTUS multicenter randomized trial Medical vs Surgical Rx of GERD pts with Barrett s 554 patients with GERD 60 pts with BE (28 to PPI, 32 to LARS) 4 pts with treatment failure Esophageal ph better controlled after LARS No difference in post-operative complications Similar level of symptomatic reflux control Success of LARS is similar in pts w or w/o BE

23 Collis-Belsey procedure Nissen Fundoplication

24 Schnell et al: Endoscopic surveillance q3 months for 1 st year, q6 months 2 nd year, yearly thereafter Mean follow up 7.3 years Only 16% cohort developed cancer

25 1. Schnell TG, et al. Long term non-surgical management of Barrett s esophagus with high-grade dysplasia. Gastroenterology 2001;120(7):

26 1,550 Barrett's patients 7,000 EGDs 46,000 Barrett's specimens read by the same pathologist Intensive endoscopic surveillance with biopsies rather than immediate esophagectomy is the management of choice for patients with flat HGD and no cancer Surgical resection of the esophagus should be reserved only for those patients in whom cancer has been documented

27 Dysplasia Documentation Follow-up None Two EGD w/bx in1 yr Endoscopy q 3 yrs Low Grade High Grade Highest grade Bx within 6 months Expert pathologist Mucosal irregularity Repeat EGD w/ bx within 3 months Expert pathologist 1 yr interval until no dysplasia x 2 Endoscopic resection q 3 month EGD surveillance or intervention based on results and patient 1. Wang KK, Sampliner RE. Updated Guidelines 2008 for the Diagnosis, Surveillance and Therapy of Barrett s Esophagus. Am J Gastroenterol 2008;103:

28 Endoscopic Mucosal Resection Less invasive than esophagectomy Saline lift, snare removal, band tecnique Determines depth of invasion of visible lesion Endoscopic excision of lesions up to 1.5cm Ell et al: 98% survival at 5 yrs Highly selected pts with early EAC Well diff. intramucosal tumors w/o lymph invasion Short-segment Barrett s esophagus 1. Ell C, et al. Curative endoscopic resection of early esophageal adenocarcinomas (Barrett s cancer). Gastrointest Endosc 2007;65:3-10.

29 Endoscopic ablation: Electrocoagulation l Laser Argon-beam coagulation Radiofrequency ablation Photodynamic therapy (PDT) PDT Porfimer sodium Light of specific wavelength (630 nm) Intracellular l reaction leads to cell death Strictures Residual buried Barrett s dysplasia and cancer

30 Remains the standard of care for HGD High volume centers = low mortality Minimally invasive approach Vagal-sparing esophagectomy No vagotomy or pyloroplasty 95% cancer survival at 5 years Early cancers confined to mucosa No need for extensive lymphadenectomy y 1. Peyre C, DeMeester SR, Rizzetto C, et al. Vagal-sparing esophagectomy: the ideal operation for intramucosal adenocarcinoma and Barrett s with high grade dysplasia. Ann Surg 2007;246:

31 1. Rice TW, et al. Refining esoghageal cancer staging. J Thorac Cardiovasc Surg 2003;125:

32 Described by Akiyama et al in Japan Reduced morbidity Dumping syndrome Diarrhea Weight loss Stripping Invagination of muscle Colon interposition 1. DeMeester SR. New Options for the Therapy of Barrett s High Grade Dysplasia and Intramucosal Adenocarcinoma: Endoscopic Mucosal Resection versus Vagal-Sparing Esophagectomy. Ann Thorac Surg2008;85:

33 Das et al: 742 pts 99 pts (13.4%) treated w/emr 643 (86.6%) pts treated w/esophagectomy Stage 0 and Stage 1 esophageal cancer Follow up for 56 and 59 m respectively No statistical significance in 5 yr survival Most EMR pts were stage 0 Esophagectomy pts were stage 1 1. Das A, et al. A Comparison of Endoscopic Treatment t and Surgery in Early Esophageal Cancer: An Analysis of Surveillance Epidemiology and End Results Data. Am J Gastroenterol 2008;103:

34 Barrett s esophagus is as much a surgical as it is a medical disease Early detection is key to success in management Surveillance even after anti-reflux therapy is of utmost importance With new endoscopic advances; careful selection of patients for treatment approach Goal is: Keep Cancer Away

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36 A 58 y.o. male with history of GERD undergoes EGD with biopsy results of high grade dysplasia. What s the next step in management of this patient? a. Esophagectomy b. Medical trial with PPI s c. Endoscopic Mucosal Resection d. Repeat EGD and biopsy in 3 months Answer: d

37 Intestinal metaplasia is differentiated from gastric metaplasia by presence of: a. Parietal cells b. G cells c. Goblet cells d. Columnar epithelium Answer: c

38 Which of the following statements about Barrett s is NOT true? a. 40% of patients are asymptomatic b. Treatment is directed based on degree of dysplasia c. If dysplastic segment < 3cm, no intervention is necessary d. Severe esophagitis can mask areas with intestinal metaplasia e. 0.5% to 1.0% pts/yr progress to adenocarcinoma Answer: c

39 Which of the following statements about Barrett s is NOT true? a. Most pts who develop carcinoma in Barrett s are men aged 55 to 60 b. Pts with high grade dysplasia should undergo esophagectomy c. Endoscopic surveillance effectively reduces the stage at presentation to stage 2 or lower d. Barrett s occurs in 10% to 15% of pts with GERD e. Low-grade dysplasia should be treated with an antireflux procedure as well as antacids Answer: e

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