il polipo cancerizzato del colon-retto - gipad · adenoma adenoma is defined as a lesion of the...
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Dipartimento di Medicina Sperimentale e Clinica Sezione di Chirurgie Specialistiche
e di Diagnostica Istopatologica e Molecolare Università degli Studi di Firenze
Luca Messerini
Il polipo cancerizzato del colon-retto
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Adenoma
Adenoma is defined as a lesion of the colon or rectum containing unequivocal epithelial neoplasia (European Guidelines 2010).
Adenomas are defined by the presence of dysplastic epithelium (WHO 2010).
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Peduncolated
Sessile
Slightly elevated
Slightly depressed
Completely flat
< 2.5mm
> 2.5mm
Polypoid Non-Polypoid
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SIZE MEASUREMENT OF
POLYPS Endoscopy
Fresh Specimens
Formalin-fixed Specimens
Histology Slides
GRADING OF
NEOPLASIA/DYSPLASIA It is divided into low and high grade to improve interobserver agreement, with high grade equating “severe dysplasia” in older systems. Mucosal high grade neoplasia is diagnosed on architecture, supplemented by an appropriate cytology. Changes of mucosal high grade neoplasia should usually involve one or two glands, sufficient to be identified at low power examination.
GRADING OF VILLOUSNESS
Classical Villi Palmate Villi
Foreshortened Villi
Authors Phil Quirke
Mauro Risio
Renè Lambert
Michael Vieth
[Quirke, Risio , Lambet, Vieth 2010]
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Mucosal neoplasia
Category 3 Category 4.1 4.2 4.3 4.4
Category 5: submucosal invasion by carcinoma
Low-grade High-grade
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«Neoplastic lesions
confined to mucosa
have virtually
no risk of metastasis»
«The defining feature
of colorectal cancer
is invasion through
the muscularis mucosae»«
[S.R. Hamilton, 2000] Fenoglio et al, Gastroenterology 1973
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• Adequacy of the excision
• Grading of the carcinoma
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7.5.3.4. MARGIN INVOLVEMENT There has been considerable discussion and controversy in the literature over what degree of clearance might be regarded as acceptable in tumours that extend close to the deep submucosal margin. It is important that clearance is measured and recorded in the report. Currently we would recommend that clearance of 1 mm or less indicates margin involvement.
1 field Morson, 1984
≤ 1 mm Cooper, 1995
< 2 mm Volk, 1995
< 3 mm Williams, 1987
[Quirke, Risio,Lambert, Vieth, 2010]
Margin involvement
pT1 Cancer
Cancerized Adenoma
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Margin involvement
2,1 mm.
2,1 mm.
Margine negativo Margine positivo (2,1-1,7= 0,4 mm.)
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pT1 Cancer
Cancerized Adenoma
[Quirke, Risio , Lambet, Vieth 2010]
8.5.3.2 TUMOR GRADE In the absence of good evidence we recommend that a grade of poor differentiation should be applied when ANY area of the lesion is considered to show poor differentiation. Budding of the tumor cells at the front of invasion should not influence grading of the tumour.
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Low-grade/G1-G2 High-grade/G3-G4
Tumour grade in pT1 lesions: poorly differentiated carcinomas are identified by the presence of either irregularly folded, distorted and often small tubules or the lack of any tubular formation and showing marked cytological pleomorphism. Poor differentiation should equate to the WHO categories of poor and undifferentiated tumours. The frequency should not exceed 20%.
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pT1 Cancer
Cancerized Adenoma
7.5.3.3 LYMPHOVASCULAR INVASION Definite invasion of endothelium-lined vascular spaces in the submucosa is generally regarded as a significant risk for lymph node or distant metastasis. Sometimes retraction artefact around tumour aggregates can make assessment uncertain, in which case this uncertainty should be recorded and the observation interpreted in a multidiscipliary conference in the light of any other adverse histological features. At the moment there are no consistent data available on the additional use of immunohistochemistry.
[Quirke, Risio , Lambet, Vieth 2010]
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Parametri istologici Favorevoli Sfavorevoli
Grading G1,G2 G3,G4
Emboli vascolari assenti presenti
Margine di resezione negativo positivo
L Messerini et al.
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Head
Neck
Stalk
Bowell Wall
We conclude that the level of invasion should be the major factor in determining prognosis for the management of carcinoma arising in an adenoma.
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Kikuchi 1995
Kudo S 2003
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pT1 Cancer
Cancerized Adenoma
7A.4.2 SUBSTAGING Neither the Kikuchi (for sessile lesions) nor Haggitt (for polypoid tumors) are easy to use in practice. The depth and the width of invasion provides a more objective measure. Each classification has advantages and disadvantages. All three approaches need to be evaluated on large series from screening programmes to derive evidence-based recommendations.
[Quirke, Risio , Lambet, Vieth 2010]
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7.5.3.5 Tumor Budding Tumour cell budding, i.e., the presence of small islands or single infiltrating tumour cells at the front of tumour invasion. Its ability to predict metastases compared to the previously discussed factors has been proven. However, the diagnostic criteria vary, and studies are in progress to assess its reproducibility. Its evaluation and reporting in accordance with Ueno criteria are advisable, though not mandatory, at this time.
Authors Phil Quirke
Mauro Risio
Renè Lambert
Michael Vieth
[Quirke, Risio , Lambet, Vieth 2010]
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Cancerized adenoma : assessment of the metastatic risk
• Margin status • Carcinoma Grading • Vascular Invasion • Tumor Budding
+ • Microstaging
Risio et al, GISCoR 2006
MINIMAL RISK (0-0,7%)
LOW RISK (8-18%)
HIGH RISK (20-40%)
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Degree of submucosal invasion Level of the polyp yes Submucosal invasion depth (µm) yes Submucosal invasion width (µm) no
Cancer morphology Budding yes Poorly differentiated clusters yes Infiltrating growth no
Host response Inflammatory cell infitration no Proliferation of myofibroblast no Microvessell density no
Others Adenoma component no
Parameters Validation
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Head invasion = Haggitt’s level 1: the depth of submucosal invasion was considered to be 0 µm. Stalk invasion = Haggitt’s level ≥2: the vertical distance from the line between the head and the stalk («Haggitt’s line») to the invasive front was measured as the depth of submucosal invasion.
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The risk for lymph-nodes metastasis can be classified into three groups:
• High risk: depth of submucosal invasion ≥1000 µm and high grade budding/sprouting
• Intermediate risk: depth of submucosal invasion ≥1000 µm and low grade budding/sprouting
• Low risk: depth of submucosal invasion <1000 µm
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VALUTAZIONE PARAMETRI DI RISCHIO 1) limite di escissione (distanza dal punto di maggiore infiltrazione della sottomucosa) □ margine positivo (distanza ≤ 1mm.) □ margine negativo (distanza >2mm.) □ margine non valutabile □ margine dubbio ( distanza >1 ≤ 2 mm.) per questa categoria i dati riportati in letteratura sono contrastanti e non indicano in maniera univoca se considerare con sicurezza il margine come positivo o negativo. Tali casi dovrebbe essere discussi con i clinici per scegliere il percorso più opportuno. 2) grado di differenziazione (linee guida europee 2010) □ elevato (G1) □ moderato (G2) □ basso (G3) □ indifferenziato (G4) 3) invasione vascolare □ presente □ venosa □ linfatica □ assente □ non valutabile
4) microstadiazione □ livelli di Haggitt: □ 1 □ 2 □ 3 □ 4 (polipi peduncolati) □ classificazione di Kikuchi: □ sm1 □ sm2 □ sm3 (polipi sessili) □ misurazione invasione della sottomucosa (Ueno 2004) profondità __________µm ampiezza ___________µm
5) altre caratteristiche microscopiche budding tumorale □ assente □presente (<5 foci vs. ≥ 5 foci Ueno 2004) cluster poco differenziati □ assente □ presente
(opzionali?)
?
?
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follow-up
follow-up o
resezione chirurgica
resezione chirurgica
1) a bassissimo rischio grado di differenziazione G1 o G2 emboli neoplastici assenti distanza dal margine ≥2 mm budding assente invasione sottomucosa <1000 µm
2) a basso rischio grado di differenziazione G1 o G2 emboli neoplastici assenti distanza dal margine <1 mm. < 2mm. budding assente invasione sottomucosa <1000 µm
3) ad alto rischio grado di differenziazione G3 o G4 emboli neoplastici presenti distanza dal margine ≤1 mm. budding presente invasione sottomucosa ≥1000 µm
Categorie Evoluzione Trattamento di rischio sfavorevole
0-1%
0-4%
0-35%
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Prelievi bioptici multipli o la frammentazione della
lesione non consentono di valutare:
- l’infiltrazione della sottomucosa
- il margine di resezione
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Immunoistochimica: desmina.
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Take home message
• Fissazione e campionamento secondo protocollo
• Valutazione di: margine di escissione grading emboli neoplastici
• Valutazione budding
• Microstaging (profondità invasione sottomucosa)
• Categorie di rischio
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Le Condizioni della Diagnosi:
Trattamento (“Handling”) del Polipo
Polipi Diminutivi (< 0,5 cm) appoggiati
su supporto rigido col piano di exeresi
(Staff di Endoscopia)
Marcatura della base per polipi semi-
peduncolati o con peduncolo < 0,3 cm
(Staff di Endoscopia)
Prelievo paracentrale
(Piano medio-sagittale)
+
Sezioni parallele ogni 2 mm
+
Calotte laterali residue GISCoR, 2006
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