oesophagus and stomach update dysplasia and early cancer tb spr og.pdf · oesophagus and stomach...
TRANSCRIPT
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Oesophagus and Stomach update
dysplasia and early cancer
Dr Tim Bracey (new Peninsula TPD!)
STR teaching 13/4/16
Please check pathkids.com for previous talks
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•One of the biggest units in the
country (100 major resections per
annum. 6 OG surgeons, 1 pathologist!)
•All biopsies of suspected OG
cancers/HG dysplasia from 5
hospitals reviewed with
radiology /clinical / endoscopic
findings
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Local OG workload
Dysplasia
Dysplasia
Last audit (2014-2015) showed 524 cases received from
Outside PHNT, almost doubled since 2013, with >10%
dysplasia cases for review (more difficult than cancer!)
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Types of Barrett’s oesophagus
3cm
1cm
OGJ
Long segment
Short segment
Ultra short segment
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Types of Barrett’s oesophagus
3cm
1cm
OGJ
Long segment
Short segment
Ultra short segment
Intestinal metaplasia
at the cardia .
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Sharma et al. Gastroenterology 2006 ;131:1392-9.
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Definite Barrett’s (UK and USA!)
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“A diagnosis of BE should not require
demonstration of goblet cells in mucosal biopsies”
Am J Gastroenterol 2009; 104:2588-94.
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UK Guidelines 2013
Barrett’s oesophagus is considered any portion of the normal distal
squamous epithelial lining has been replaced by metaplastic columnar
epithelium (>1cm) above OGJ → No need for intestinal metaplasia.
Endoscopic report should include length of Barrett’s using the Prague
criteria.
Short segments of columnar epithelium (<3cm) with no intestinal
metaplasia and no native oesophageal structures should be regarded as
equivocal for a diagnosis of Barrett’s oesophagus.
All cases of suspected dysplasia / indefinite for dysplasia should be
reviewed by a second pathologist with a specialist GI interest.
p53 immunostaining to the histopathological assessment may improve
the diagnostic reproducibility of a diagnosis of dysplasia
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Only a quarter of LGD is confirmed at specialist center
Confirmed cases have 9.1% risk of progression in 3yrs
ND and IFD have 0.6% and 0.9% progression rate
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Types of dysplasia in Barrett’s oesophagus
• Adenomatous type
• Gastric foveolar type.
• Crypt dysplasia.
• Mixed
• ?Gastric pyloric type
Grading of gastric foveolar-type dysplasia in Barrett's
esophagus.
Mahajan D1, Bennett AE, Liu X, Bena J, Bronner MP.
Mod Pathol. 2010 Jan;23(1):1-11.
Gastric/fovolar type dysplasia has no requirement for intestinal metaplasia!!
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Indefinite for dysplasia
PPI increased
Repeat biopsy 6/12
No dysplasia
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Indefinite for dysplasia
Doesn’t mean we are indecisive!
It is a holding category and the reasons for
using it should be stated in the report
Favour reactive or suspect dysplasia?
Inflammation or technical (eg. Small bx)
“optimisation of acid suppression and
repeat biopsy is recommended”
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A1 A2 A3
B1 B2 B3
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A1 A2 A3 B1 B2 B3
Path 1 oDys oDys Indef Indef Indef Indef
Path 2 Indef Indef LGD Indef Indef Indef
Path 3 LGD LGD LGD LGD LGD Indef
Path 4 oDys oDys Indef Indef Indef Indef
A1 A2 A3
B1 B2 B3
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Sharp cutoff / abrupt
transition favours dysplasia
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Specific areas of difficulty
Small biopsies, poor quality H&Es (IFD,L’s)
Acute inflammation
Juxtaposition of intestinal and gastric type
glands
Squamo-columnar junction
Stromal invasion
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Acute inflammation
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Juxtaposition of intestinalised and non-intestinalised glands.
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Look for
surface
maturation
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Stroma in non-dysplastic Barrett’s
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Markers in the diagnosis of
Barrett’s dysplasia
Are there any fancy stains that
help?
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Colitis-associated colon cancer
Sporadic adenoma
Barrett’s
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Colitis-associated colon cancer
Sporadic adenoma
Barrett’s
p53
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p53
Significant staining pattern
Strong staining
Absent staining pattern
Significant p53 staining in area
of interest correlates with likely
disease progression
Kaye PV et al. Histopathology 2009;54:699-712
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This is normal
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This is normal
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If only it were always
this easy (LGD)
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If only it were always
this easy (LGD + p53)
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Remember (complete) loss of p53 expression also
correlates with neoplasia
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High grade dysplasia
Easier to diagnose for the generalist but
still some difficulties
If there is a nodule then distinction from low
grade dysplasia on a bx is academic
Even flat HGD now ablated with RFA
I am particularly interested in features
which reliably predict invasion on a
subsequent excision specimen, and
particularly those that may predict risk of
(LN) metastasis
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Name two “textbook worthy”
histological features of
invasive adenocarcinoma on
a mucosal biopsy
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Single cell / signet ring infiltration of lamina propria demonstrated with MNF116
immuno. Older pathologists will tell you mucin stain is best (but they are wrong)
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= submucosal invasion (?+arterioles)
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But note that dysplastic
glands in submucosa
doesn’t always signify
invasion
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Do you know any “softer”
histological features that
might make you suspicious of
invasion in HGD?
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*
1. Surface ulceration*
* may not be reliable in exophytic lesions
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2. Extensive cribriform / solid pattern
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3. At least 3 dilated dysplastic tubules per biopsy
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4. Extensive neutrophils – not useful in my experience
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5. Pagetoid infiltration of squamous epithelium – strongly predictive of invasion
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5. Pagetoid infiltration of squamous epithelium – strongly predictive of invasion
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CK 5 (brown) &
CAM5.2 (red)
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CK 5 (brown) &
CAM5.2 (red)
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High grade dysplasia (suspicious)
At least intramucosal adenocarcinoma
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EMR (endoscopic “mucosal” resection
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What is the implication of
diagnosing submucosal
invasion in EMR?
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Submucosal (pT1b) invasion predicts LN metastasis
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Liu L et al. Am J Surg Pathol. 2005 Aug;29(8):1079-
85.
T1a – lamina propria. T1b – muscularis mucosae. T1c – superficial submucosa. T1d – deep submucosa.
T1aT1a
T1b
T1b
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Endoscopic mucosal resection
(EMR)
Usually diathermy artefact – no need to ink.
Often multiple with dysplasia at circumferential margins.
Orientation and exact site usually lost.
Diagnostic, therapeutic and “debulking” procedure!
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Endoscopic mucosal resection (EMR) +
Endoscopic submucosal dissection
(ESD)
Ideally pin
out on cork
board
Fix in >3x
volume of
formalin
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Endoscopic mucosal resection
(EMR)
Resection not a biopsy.
Treat like a cervical cone (do NOT
bisect!).
If received orientated – ink margins.
4 – 15mm
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Endoscopic mucosal resection
(EMR)
- Ends in one cassette
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Ideally only 2 sections a cassette to optimise orientation
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Endoscopic mucosal resection (EMR)
Diagnosis of dysplasia/IMC/ invasive.
Stage lesion.
Circumferential margins.
Deep resection margin.
Diagnosis of dysplasia/IMC/ invasive.
Stage lesion.
Circumferential margins.
Deep resection margin.
SIMPLE?
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Sectioning/fixation artefact
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Sectioning/fixation artefact
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Where / if possible do not report pT staging and invasion on ends!
Sectioning/fixation artefact
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Intramucosal adenocarcinoma
• Poor agreement between histopathologists.
• Clinicians keen to separate HGD from IMA.
• Need for criteria forwell/moderately differentiated lesions.
• Consensus - architectural change with horizontal rather than vertical orientation of glands.
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Beware dilated bland glands –
usually (at least) IMA!
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Early oesophageal adenocarcinoma often lacks a desmoplastic stroma –→ Pattern of infiltration / low power view important (Cytokeratin).
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What staging systems do you
know for measuring depth of
invasion in early GI cancer?
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Oesophagectomy specimens:
SM1 upper 1/3
SM2 middle 1/3
SM3 lower 1/3
EMRs
SM1 < 500 um
SM2 > 500 - 1000 um
SM3 > 1000 um
Staging of submucosal disease
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pT1a (Shimada 2006)
●M1 – Limited to the epithelial layer (HGD / IMC).
●M2 – Invades the lamina propria.
●M3 – Invades into but not through the muscularis mucosa.
pT1b (modified Kikuchi)
●SM1 – Infiltrates submucosa <500 microns.
●SM2 – Infiltrates submucosa <1000 microns.
●SM3 – Infiltrates submucosa ≥1000 microns.
Staging of EMRs
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Takubo et al. Hum Pathol. 1991 Nov;22(11):1158-61.
Double muscularis mucosae in 87.5% Barrett’s patients!!
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What immunostains can make our life easier
reporting EMRs?
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Use of desmin staining in staging EMRs
Stage lesion.
Measure depth of invasion beyond muscularismucosae.
Desmin staining can be very helpful in delineating the lower border of the muscularis mucosae
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Desmin staining
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0.8mm invasion beyond muscularis mucosae
→ pT1b, SM2
0.8mm
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Simple proforma – RCPath dataset pending
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MNF116 (brown) &
desmin (red)
The future?
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Simple?This ppt will be on pathkids.com with all the others!
Please don’t re-publish my slides anywhere online as many of th
em
belong to Marco Novelli at UCH butI have used with his permissi
on!
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Slide seminar on multiheaderclick to access hyperlinks below
Examples indefinite for dysplasia one and two (inc sq islands)
Juxtaposition of intestinal and specialised glands mimicking
dysplasia
Gastric Foveolar adenoma
Mixed Oxyntic/Foveolar adenoma
Nice example of flat high grade dysplasia
EWDA foveolar adenocarcinoma
Pagetoid invasion of oesophageal squamous epithelium
Superficial gastric EBER+ lymphoepithelial carcinoma
Oesophageal carcinosarcoma