screening for early gi cancer seeing beyond naked eyes
TRANSCRIPT
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Screening forScreening forEarly GI CancerEarly GI Cancer
Seeing beyond naked eyesSeeing beyond naked eyes
Joseph Sung MD, PhDJoseph Sung MD, PhDProfessor of MedicineProfessor of Medicine
Institute of Digestive Disease, CUHKInstitute of Digestive Disease, CUHK
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How Common is GI Cancers?
0
0.5
1
1.5
2
2.5
3
3.5
GI Lung Breast GU GYN Leukemia
New Cases Death
No.
of
pati
ents
(M
+F,
mill
ion
)
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Mortality of GI Cancers
0
200
400
600
800
1000
Colorectal Stomach Liver Esophagus Pancreas
New Cases Death
No.
of
pati
ents
(M
+F,
th
ousa
nd)
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Why bother to diagnose Early GI Cancer
• Carcinoma involving the mucosa or submucosa
• Excellent prognosis– Risk of lymphovascular metastasis is low
• Difficult to diagnose– Early stage, asymptomatic
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The management processThe management processEarly Gastric CancerEarly Gastric Cancer
Recognition of Early Recognition of Early Gastric CancerGastric Cancer
Staging of EGCStaging of EGC
HistopathologyHistopathology
ManagementManagement
EndoscopyEndoscopy
PathologyPathology
RadiologyRadiology
SurgerySurgery
EndoscopyEndoscopy
EndoscopyEndoscopy
Endoscopic Endoscopic resectionresection
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Aim of Endoscopic AssessmentAim of Endoscopic AssessmentEarly Gastric CancerEarly Gastric Cancer
• To establish the diagnosis
• To assess the depth of invasion
• To define the margin of involvement
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Key to diagnose Early GI Cancer
“High index of suspicion”
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Endoscopic AssessmentEndoscopic AssessmentEarly Gastric CancerEarly Gastric Cancer
1. Classification of EGC(Type 0) – I – protruded
– II – superficial• IIa – elevated• IIb – flat • IIc – depressed
– III - excavated
I
IIa
IIb
IIc
III
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ChromoChromo--endoscopyendoscopyContrast endoscopyContrast endoscopy
• Indigocarmine (0.5%)• Cells not stain
– Pooling between pits – Aim –
• to improve the contrasting effect
• For delineation of early gastric cancer / possible lesions
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SS--colon: 8mm colon: 8mm IIcIIc, sm1 (microscopically extended submucosal cancer), sm1 (microscopically extended submucosal cancer)
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HighHigh--grade dysplasia in the longgrade dysplasia in the long--standing UC (19yrs aft. Onset)standing UC (19yrs aft. Onset)
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BE by chromoendoscopy
• 400 patients with suspected SSBE
• Chromoendoscopywith 0.5% crystal violet
• Detecting BE with sensitivity 89.2% specificity 85.7%
Amano Y et al. Am J Gastro 2005
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•• Spray to the entire stomach or colon:Spray to the entire stomach or colon:time consuming and relatively high costtime consuming and relatively high cost
•• MethyleneMethylene blue: blue: less expensive and obtain good imagesless expensive and obtain good imagesinduce oxidative damage of DNA when photosensitized by induce oxidative damage of DNA when photosensitized by
white light white light OlliverOlliver JR, et al. Lancet. 2003;362:373JR, et al. Lancet. 2003;362:373--4.4.
Disadvantages of dye spraying method
Alternative safe and convenient methodAlternative safe and convenient methodinstead of dye spray?instead of dye spray?
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Magnifying endoscopyMagnifying endoscopyEarly gastric cancerEarly gastric cancer
• 80 times optical magnification
• Subepithelialmicrovasculararchitecture (MV)
• Muscosal pit pattern / Microsurfacestructure (MS)
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Magnifying endoscopyMagnifying endoscopyEarly gastric cancerEarly gastric cancer
Subepithelial capillary network (SECN)
1.Density of vessel2.Extend of branching3.Diameter & length of vessels4.Direction of vessels
Akisato et al. Keio J Med 1973
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Magnifying endoscopyMagnifying endoscopyEarly gastric cancerEarly gastric cancer
• SECN• Microvasculature size
– EGC vessels significantly larger than benign gastric lesions upon magnifying endoscopy
– 4.45±0.29 vs 4.03±0.25 (p<0.0001)
Ohashi et al. Endoscopy 2005
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Magnifying endoscopyMagnifying endoscopyEarly gastric cancerEarly gastric cancer
• Microsurface structure (MS)
• Loss of regular pit pattern– 83% accuracy– 97% sensitivity– 81% specificity
Dinis-Ribeiro et al GIE 2003Yoshida et al GIE 2005
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ChromoendoscopyChromoendoscopyDisadvantagesDisadvantages
• Need dye assisted assessment
• Need time to prepare
• Vigorous wash of mucus before application
• Dye induced discomfort
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Novel Endoscopic TechnologyNovel Endoscopic TechnologyTowards Optical Towards Optical ChromoendoscopyChromoendoscopy……
Recognition of Early Recognition of Early Gastric CancerGastric Cancer
Narrow band imagingNarrow band imaging
AutofluorescenceAutofluorescenceendoscopyendoscopy
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NBI plus magnifying endoscopyNBI plus magnifying endoscopyNormal gastric mucosaNormal gastric mucosa
• Subepithelialcapillary network (SECN)
• Normal Gastric Body– Polygonal loop– Connecting venules
(CV)
Yao et al GIE 2002
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Narrow Band Illumination
White light is composed of various wavelengths.
NBI Filter = Specially Coated Glass
Looks White Narrow Band Illuminations
#2 #1
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Narrow-band imaging system
changes conventional optical filters (red, green, blue) to spectral narrow band filters
Broad band filtersBroad band filters Narrow band filtersNarrow band filters
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Narrow-band imaging system• visible blue light penetrating only superficial areas of the
tissue•• blue light with NB filter (415 nm) is well absorbed well by blue light with NB filter (415 nm) is well absorbed well by HbHb
so that NBI can image the superficial capillary structuresso that NBI can image the superficial capillary structures
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Structure of Vessels in Human Tongue
415nm 445nm 500nm 540nm 600nm
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Magnifying NBI image of gastric mucosa
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NBI plus magnifying endoscopyNBI plus magnifying endoscopyNormal gastric mucosaNormal gastric mucosa
• Normal Gastric Antrum– SECN: coiled shaped – No connecting venules
– CV occurs in deeper part of lamina propria of antrum than body
Yao et al 2007
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Mucosal Vessel Network
NBI showing not only thick veinsbut also fine capillaries Comparing conventional vs NBIColonoscopy
A 0-IIa lesion (7mm in diameter) seen as a brown lesion. The pit pattern (IIIs, IIIL) by Kudo is seen in magnification
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NBI plus magnifying endoscopyNBI plus magnifying endoscopyEarly Gastric Cancer limit to mucosaEarly Gastric Cancer limit to mucosa
• Microvascularpattern / SECN– Irregular– Torturous
• Microstructure pattern / pit– Irregular– Absence of central pit
Yao et al. 2007
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NBI plus magnifying endoscopyNBI plus magnifying endoscopyEarly Gastric Cancer Early Gastric Cancer beyond beyond submucosasubmucosa
• Microvascularpattern / SECN– Neovascularization
• Microstructure pattern / pit– Loss of pit pattern
Dinis-Ribeiro et al GIE 2003. Yoshida et al GIE 2005
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Blue fringe⇒Light blue crest:A fine, blue-white
line on the crests of the epithelial surface/gyri
Uedo N, et al. Endoscopy 2006;38:819-824
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*An image of Beroe cucumis Fabriciu was provided by Ito K
LBC may be originated by dense reflection of the short λ at the ciliated tissue structure
Duodenal mucosa
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NBI Magnifying EndoscopyNBI Magnifying EndoscopyEarly gastric cancer differentiationEarly gastric cancer differentiation
Fine network
Corkscrew
Unclassify
Differentiated (109)
66.1% 3.7% 30.3%
Undifferentiated (56)
3.6% 85.7% * 10.7%
* P = 0.0011
Nakayoshi et al Endoscopy 2005
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AFI images of early gastric cancers
Uedo N, Gastrointest Endosc 2005;62:521-8
Pyloric growth Fundic atrophy
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Optical Optical ChromoendoscopyChromoendoscopyAutofluorescenceAutofluorescence imaging (AFI)imaging (AFI)
• Difference in endogenous fluorophores between normal & cancer
• Xillix LIFE– Need fibreoptic endoscope
• Olympus AFI (Q240FZ)– Videoscope
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AutofluorescenceAutofluorescence imagingimagingEarly Gastric CancerEarly Gastric Cancer
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AutofluorescenceAutofluorescence endoscopyendoscopyClinical experienceClinical experience
No of lesions
WLI AFI Chromo
Overall 22 8 (36%) 15 (68%) 20 (91%)
Ulceration 6 1 (17%) 2 (33%) 6 (100%)
Flat extension
5 5 (20%) 4 (80%) 5 (100%)
Uedo et al Dig Endosc 2006
Diagnostic accuracy for EGC
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Color difference in background mucosa
Fundic
Atrophic
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Color of the gastric bodyPurple (n=36) Green (n=26)
P-value
Activity 0.9±0.7 0.9±0.8 0.624
Inflammation 2.1±0.8 1.9±0.5 0.975
Atrophy 1.6±0.6 1.9±0.8 0.030Intestinal metaplasia 0.8±1.2 2.0±1.0 0.000
Histological score of gastritis in relation to the AFI color of the gastric body
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AFI/NBI in diagnosis of Hp associated gastritis
• AFI shows extent of mucosal atrophy as green areas in the gastric body
• NBI visualizes areas containing intestinal metaplasia as whitish patchy areas
• LBC in magnifying NBI is anaccurate sign for the diagnosis of intestinal metaplasia
• It requires neither drug administration nor dye spraying
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Why is the lesion?
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What is it?
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How extensive?How extensive?
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How deep?How deep?
EMR with ESD – T1m
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What to do?What to do?
ESD – T1m
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Is it an ulcer?Is it an ulcer?
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Probably notProbably not
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Virtual HistopathologyVirtual Histopathology
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Virtual HistopathologyVirtual HistopathologyEarly Gastric CancerEarly Gastric Cancer
Recognition of Early Recognition of Early Gastric CancerGastric Cancer
HistopathologyHistopathology
EndocytoscopyEndocytoscopy
ConfocalConfocalendomicroscopyendomicroscopy
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EndocytoscopyEndocytoscopy
• Prototype– 400x or 1100x
• Contact endoscope– From working channel
• Observation to cellular level
3.4mm
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EndocytoscopyEndocytoscopyResultsResults
• 87 cases– 95.4% high quality
images – 18 cases gastric
cancer– 4 of these cannot get
good images because of mucus
WLE
Light source
Endocytoscopy Working channel
Inoue et al Endoscopy 2006; Inoue et al GastrointestEndoscopy Clin N Am 2004
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EndocytoscopyEndocytoscopyEarly gastric cancerEarly gastric cancer
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Confocal endomicroscopy
Argon ion laser wavelength 488nmScan rate 0.8 (1024x1024 pixels)-1.6 (102x/512 pixels) frames/sec
Optical slice thickness 7μm Lateral resolution 0.7μm
Pentax (EC3870K)Diameter 12.8mm
Distal tip: air and water nozzle2 Light guides
Auxiliary water jet2.8mm working channe
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ConfocalConfocal endomicroscopyendomicroscopy
Acraflavine stain superficialepithelial cells
Fluorescin stains deeperlaminar propria and vessels
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Detection of aberrant cryptsKeisslich et al. GE 2004
Normal colonicmucosa1. Goblet cell2. Crypt lumen3. Stroma
Aberrant colonic crypt
Fusion of cryptswith irregular shape
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Confocal Endomicroscopy
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ConfocalConfocal endomicroscopyendomicroscopyEarly gastric cancerEarly gastric cancer
• 2004 - 2006• 54 patients: confocal
endomicroscopyexamination– 27 EGC– Pathologist interpretation– Accuracy of diagnosis 94.2% to
96.2%
Kitabatake et al Endoscopy 2006
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Seeing beyond naked eyes
No suspicious area Suspicious lesion
Capsule Endoscopy
Endoscopic Submucosal Dissection
White light endoscopy
Screening through AFI
Magnifying endoscopesNBI: vascular and pit patternEUS: depth of lesion
EndocytoscopyConfocal Endomicroscopy
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Future of Endoscopy
Courtesy of Prof. N Reddy
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ConclusionsConclusions
• Novel technology enhanced the endoscopic detection and assessment for early cancers to determine the size and depth
• Optical biopsy is feasible with endocyto-scopy and confocal endomicroscopy
• One-step endoscopic management is possible from diagnosis, staging to curative resection
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Prince of Wales HospitalThe Chinese University of Hong Kong