acoi
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Barrett’s EsophagusBarrett’s EsophagusEndoscopic DiagnosisEndoscopic Diagnosis
Alessandro RepiciAlessandro Repici
Dept of GastroenterologyDept of Gastroenterology
Molinette Hospital, TorinoMolinette Hospital, Torino
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Historical notesHistorical notes
1906, Tileston1906, Tileston
1957, Barrett1957, Barrett
1975, Naef1975, Naef
“peptic ulcer of the esophagus” with a close resemblance of the mucous membrane to that found in the stomach
““The lower esophagus lined by columnarThe lower esophagus lined by columnar epithelium” (epithelium” (erroneously considered erroneously considered as congenital)as congenital)
“Columnar-lined oesophagus: an acquired lesion with malignant predisposition”
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Which length?
Which metaplasia?
Barrett’s Esophagus: diagnostic issues
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1998 A.C.G.: …”1998 A.C.G.: …”a change in the a change in the
esophageal epithelium of esophageal epithelium of any lengthany length
that can be recognized at endoscopy that can be recognized at endoscopy
and is confirmed to have and is confirmed to have intestinal intestinal
metaplasiametaplasia by biopsy by biopsy” ”
Presence of Goblet Cellsbecomes a “must”
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A: Damage to the superficial compartments through acid or bile
B: Damage to the cellular layers and activation of toti- potential cells
Histomorphological changes in Barrett‘s esophagusHistomorphological changes in Barrett‘s esophagus
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Development of areas with mucin secreting cells with resistance against acid and bile
Jankowski, AJP 1999
Histomorphological changes in Barrett‘s esophagusHistomorphological changes in Barrett‘s esophagus
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>> 3 cm, Barrett 3 cm, Barrett
< 3 cm, < 3 cm, Short BarrettShort Barrett
Super Short BarrettSuper Short Barrett
AAJG 2000
Macroscopic classification
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Easy to identify Long-segment Barrett
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4
SCJ=„squamocolumnar junction“
OGJ=„oesophagogastric junction“
Correct definition of OGJ allows detection of shortsegments of Barrett’s esophagus
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BE: ProgressionBE: Progression
BE (no dysplasia)BE (no dysplasia)
Low-grade dysplasiaLow-grade dysplasia
High-grade dysplasiaHigh-grade dysplasia
Esophageal adenocarcinomaEsophageal adenocarcinoma
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Biomarkers in BEBiomarkers in BE Multiple genetic lesions occur during the neoplastic Multiple genetic lesions occur during the neoplastic
progression of BEprogression of BE
Biomarkers may be used for risk assessment of Biomarkers may be used for risk assessment of patients as well as intermediate endpoints in trialspatients as well as intermediate endpoints in trials
17p (p53) LOH and p16 abnormalities seem to 17p (p53) LOH and p16 abnormalities seem to predict progression to cancer in BE patientspredict progression to cancer in BE patients
No realiable markers of Cancer progressionNo realiable markers of Cancer progression are currently availableare currently available
Reid BJ, DDW 2001Reid BJ, DDW 2001
Wong DJ, DDW 2001Wong DJ, DDW 2001
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Endoscopic diagnosis
• Surveillance
• Detection of dysplasia
• Staging of the disease
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Endoscopic Surveillance of Endoscopic Surveillance of Barrett’s EsophagusBarrett’s Esophagus
Optimal endoscopic techniqueOptimal endoscopic technique• Biopsies of all mucosal abnormalities (ulcer, Biopsies of all mucosal abnormalities (ulcer,
nodule, plaque)nodule, plaque)• Four quadrant (jumbo) biopsies at 1 – 2 cm Four quadrant (jumbo) biopsies at 1 – 2 cm
intervalsintervals Recommended surveillance intervalsRecommended surveillance intervals
• No dysplasiaNo dysplasia 3 yrs after 2 EGD 3 yrs after 2 EGD• LGDLGD 6m for 1 yr, then 1yr6m for 1 yr, then 1yr• HGDHGD Confirm and resect vs. 3 mConfirm and resect vs. 3 m
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LIMITATIONS OF SURVEILLANCE STRATEGYLIMITATIONS OF SURVEILLANCE STRATEGY
Cancer/Dysplasia -- multifocal and patchyCancer/Dysplasia -- multifocal and patchy ““Seattle Protocol” – cumbersome and tediousSeattle Protocol” – cumbersome and tedious
• Compliance is poorCompliance is poor Unsuspected Cancer -- up to 53% of HGDUnsuspected Cancer -- up to 53% of HGD Surveillance Intervals - poorly defined biologySurveillance Intervals - poorly defined biology Dilemma with HGD – variable interpretation Dilemma with HGD – variable interpretation
• surveillance vs. surgery?surveillance vs. surgery? Costly with unproven benefitCostly with unproven benefit
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NEEDED TECHNIQUENEEDED TECHNIQUE
Highly sensitive to dysplasia – must Highly sensitive to dysplasia – must detect changes at a nuclear leveldetect changes at a nuclear level
High resolution but also able to scan High resolution but also able to scan wide area in real-timewide area in real-time
Specific – not affected by esophageal Specific – not affected by esophageal inflammationinflammation
High interobserver agreementHigh interobserver agreement Localize dysplastic area for biopsyLocalize dysplastic area for biopsy Cost not prohibitiveCost not prohibitive
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Alternative Methods for SurveillanceAlternative Methods for Surveillance
Blind balloon cytology – sensitivity limitedBlind balloon cytology – sensitivity limited High Magnification EndoscopyHigh Magnification Endoscopy Confocal MicroscopyConfocal Microscopy Chromoendoscopy (methylene blue)Chromoendoscopy (methylene blue) Endoscopic Ultrasound (EUS)Endoscopic Ultrasound (EUS) Laser Induced FluorescenceLaser Induced Fluorescence Optical Coherence TomographyOptical Coherence Tomography Light Scattering SpectroscopyLight Scattering Spectroscopy Raman Spectroscopy Raman Spectroscopy
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BE SURVEILLANCE --BLIND CYTOLOGYBE SURVEILLANCE --BLIND CYTOLOGY
AdvantagesAdvantages• Sample larger areaSample larger area• Quick and InexpensiveQuick and Inexpensive
DisadvantagesDisadvantages• Limited sensitivity (< 25% for LGD)Limited sensitivity (< 25% for LGD)
Future HopeFuture Hope• Molecular probesMolecular probes
ImmunostainsImmunostains FISHFISH
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HIGH MAG – DETECTING BEHIGH MAG – DETECTING BE
Contrast AgentsContrast Agents• Acetic acidAcetic acid• Indigo carmineIndigo carmine• Methylene blueMethylene blue
Distinct morphology for IMDistinct morphology for IM High Sensitivity (> 95%) for IMHigh Sensitivity (> 95%) for IM Still inaccurate for LGD/HGDStill inaccurate for LGD/HGD
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HIGH MAG – DETECTING DYSPLASIAHIGH MAG – DETECTING DYSPLASIA
Sharma et al. – 80 patientsSharma et al. – 80 patients Distinct morphology - Distinct morphology - Ridged/villous/ Circular/ Ridged/villous/ Circular/
Irregular&DistortedIrregular&Distorted All 6 HGD were irregular and distortedAll 6 HGD were irregular and distorted Limitations -Limitations - Cannot distinguish LGD; Difficult for surveillance Cannot distinguish LGD; Difficult for surveillance
of large area; Results very preliminaryof large area; Results very preliminary
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Intestinal Metaplasia High Grade Dysplasia
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METHYLENE BLUE METHYLENE BLUE CHROMOENDOSCOPYCHROMOENDOSCOPY
RationaleRationale
• MB absorption by absorptive columnar MB absorption by absorptive columnar
cells (small bowel and colon)cells (small bowel and colon)
• MB not absorbed by dysplastic cellsMB not absorbed by dysplastic cells
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Focal Diffuse
Methylene blue selectively stains SCE in Methylene blue selectively stains SCE in Barrett’s esophagusBarrett’s esophagus
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Summary of StudiesSummary of Studies
FavorableFavorable MixedMixed UnfavorableUnfavorable
Canto 96-01 Canto 96-01 (>250(>250)) Horwhat 1999 A Horwhat 1999 A (42)(42)
Wo 2001 (47)Wo 2001 (47)
Kiesslich 2000 (Kiesslich 2000 (7373)) Breyer 2000 A (30)Breyer 2000 A (30) Jobson 1999 A (33)Jobson 1999 A (33)
Sharma 2001 (Sharma 2001 (7575)) Hasan 1998 A (16)Hasan 1998 A (16) Gangarosa 2000 Gangarosa 2000 (10)(10)
Sueoka 2001 (Sueoka 2001 (6060)) Dave 2001 (10)Dave 2001 (10)
Gossner 1999 A Gossner 1999 A ((6161))
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LIMITATIONS OF MB DIRECTED LIMITATIONS OF MB DIRECTED SURVEILLANCESURVEILLANCE
Stains inflammationStains inflammation
Staining paradoxStaining paradox
No time savingNo time saving
MessyMessy
Operator dependent; not sensitive enoughOperator dependent; not sensitive enough
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EUS For SurveillanceEUS For Surveillance
Theory of Ultrasound ImagingTheory of Ultrasound Imaging• Sound reflects at tissue interfaceSound reflects at tissue interface• Higher frequency equals higher Higher frequency equals higher
resolution but lower penetrationresolution but lower penetration• Useable frequencies do not provide Useable frequencies do not provide
cellular resolutioncellular resolution
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When not to do EMRWhen not to do EMR
20 Mhz probe EUS at 7.5 MHz
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LIMITATIONS OF EUSLIMITATIONS OF EUS
CANNOT DETECT DYSPLASIACANNOT DETECT DYSPLASIA
May or may not identify cancer May or may not identify cancer
reliably in HGDreliably in HGD
Accuracy for identifying malignant Accuracy for identifying malignant
nodal spread is limited.nodal spread is limited.
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LASER INDUCED FLUORESCENCE (LIF)LASER INDUCED FLUORESCENCE (LIF)
Theory Theory • Dysplastic tissue is biochemically different and Dysplastic tissue is biochemically different and
thus fluoresces differently from normal; thus fluoresces differently from normal; • Dysplastic tissue may also absorb fluorophores Dysplastic tissue may also absorb fluorophores
differentiallydifferentially Autofluorescence alone not accurate Autofluorescence alone not accurate
enoughenough Local or systemic ALA (Messman et al.) Local or systemic ALA (Messman et al.)
absorbed by dysplastic cellsabsorbed by dysplastic cells
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DIFFICULTIES WITH L.I.F.DIFFICULTIES WITH L.I.F.
Inflammation may cause false positivesInflammation may cause false positives
Dysplasia -- sensitivity < 80%, specificity Dysplasia -- sensitivity < 80%, specificity
< 70%< 70%
Cost of fluorophoreCost of fluorophore
Cost of LIF scopesCost of LIF scopes
More research; better fluorophores neededMore research; better fluorophores needed
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OPTICAL COHERENCE TOMOGRAPHYOPTICAL COHERENCE TOMOGRAPHY
Theory – Coherent back scattered Theory – Coherent back scattered light provides imaging resolution at light provides imaging resolution at microscopic level.microscopic level.
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Figure 3A
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Figure 3B
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Figure 4A
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DIFFICULTIES WITH OCTDIFFICULTIES WITH OCT
Limited sensitivityLimited sensitivity
Surveillance of large areasSurveillance of large areas
Further studies of dysplastic tissue Further studies of dysplastic tissue
requiredrequired