Upload
astin
View
57
Download
0
Embed Size (px)
DESCRIPTION
PATHOLOGY OF TUMOURS PART 3. GRADING AND STAGING PROGNOSIS. PROGNOSIS. THE PREDICTION OF FUTURE PROGRESS OF A DISEASE OR TUMOUR. PROGNOSIS. BENIGN TUMOURS – GENERALLY GOOD….. BUT DEPENDS ON SITE, TYPE ETC MALIGNANT TUMOURS SITE e.g. visceral versus superficial - PowerPoint PPT Presentation
Citation preview
PATHOLOGY OF TUMOURSPATHOLOGY OF TUMOURS PART 3 PART 3
1.1. GRADING AND STAGINGGRADING AND STAGING2.2. PROGNOSISPROGNOSIS
PROGNOSIS
THE PREDICTION OF
FUTURE PROGRESS
OF A DISEASE
OR TUMOUR
PROGNOSIS1.BENIGN TUMOURS – GENERALLY GOOD…..
BUT DEPENDS ON SITE, TYPE ETC
2.MALIGNANT TUMOURS1. SITE e.g. visceral versus superficial
2. INHERENT NATURE OF THE TUMOUR PROGNOSIS ACCORDING TO THESE TWO FACTORS DEPENDS ON:-
PAST EXPERIENCE OF EACH TYPE OF TUMOUR
MENINGIOMA – A FAIRLY BENIGN TUMOUR ARISING FROM THE DURA. PRODUCES SYMPTOMS ACCORDING TO THE REGION OF THE BRAIN IN WHICH IT ARISES. CAN BE FATAL AS IT IS A “SOL”
BENIGN MENINGIOMA – DIAGRAM TO ILLUSTRATE HOW THE TUMOUR ERODES BONE BY PRESSURE ATROPHY AND COMPRESSESTHE UNDRELYING BRAIN RAISED INTRA-CRANIAL PRESSURE
BENIGN HAEMANGIOMA OF THE LIVER – THE COMMONEST BENIGNTUMOUR OF THE LIVER – CAN BLEED SEVERELY DUE TO MINOR TRAUMA TO THE ABDOMEN
BENIGN LEIOMYOMA OF THE SMALL BOWEL – CAN CAUSE INTESTINALOBSTRUCTION AND OFTEN BECOMES MALIGNANT ( c.f. UTERINE FIBROID)
BENIGN ADENOMA OF THE PARATHYROID GLAND.
CAUSES SEVERE METABOLIC DERANGEMENTS WHICH CAN BE FATAL
NORMAL PARATHYROID GLAND
PARATHYOID ADENOMA
NEPHROCALCINOSIS
CALCIUM DEPOSITED IN THE INTERSTITIUM OF THE KIDNEY
PROGNOSISOVERALL PROGNOSIS DEPENDS ON 3 FACTORS:-1.GROWTH - RAPID GROWTH = BAD PROGNOSIS2. EXTENT – THIS FORMS THE BASIS OF – THE “TNM” CLINICAL STAGING OF TUMOURS
a. SIZE OF PRIMARY TUMOUR T0-4 WHERE T0 = IN SITU MALIGNANCYb. LYMPH NODE SPREAD N0-3
c. DISTANT METASTASES – M0-4
3. DIFFERENTIATION – HISTOLOGICAL GRADE
PROGNOSIS
THE CLINICAL STAGING OF TUMOURS
a. SIZE OF PRIMARY TUMOUR - T0-4 WHERE T0 = IN SITU MALIGNANCY
b. PRESENCE/ABSENCE OF LYMPH NODE INVOLVEMENT – N0-3
c. PRESENCE/ABSENCE OF METASTASES –M0-4
HISTOLOGICAL GRADE
OF THE TUMOUR REFERS TO THE TISSUE AND CELLULAR DIFFERENTIATION
1.WELL DIFERENTIATED
2. MODERATELY DIFFERENTIATED
3. POORLY DIFFERENTIATED
3) Tumour Grading3) Tumour Grading
Measure of Measure of prognosisprognosisExample of breast cancer:Example of breast cancer:A) Glandular differentiationA) Glandular differentiationB) Cellular pleomorphismB) Cellular pleomorphismC) Mitotic activity (per 10 HPF)C) Mitotic activity (per 10 HPF)Scored as 3 – 9Scored as 3 – 9= (modified) Bloom & Richardson grading= (modified) Bloom & Richardson grading
DIFFERENTIATION IN A SQUAMOUS CARCINOMA LIES INTHE TUMOUR’S ABILITY OR FAILURE TO
FORM KERATIN
SQUAMOUS METAPLASIA IN BRONCHIAL MUCOSASQUAMOUS METAPLASIA IN BRONCHIAL MUCOSA
Mild dysplasiaMild dysplasia
Moderate dysplasiaModerate dysplasia
Severe dysplasia / carcinoma in Severe dysplasia / carcinoma in situsitu
CIN III/SEVERE DYSPLASIA CA-IN-SITU
SQUAMOUS CARCINOMA IN SITU – i.e. CONFINED BY THE BASEMENT MEMBRANE
WHEN THE TUMOUR CELLS BREAK THROUGH THE BASEMENTMEMBRANE THEY FORM CORDS OF CELLS
INFILTRATING THE UNDERLYING STROMA
TextIN WELL-DIFFERENTIATED TUMOURS THE CELLS ARE ABLE TO PRODUCE KERATIN SEEN HERE AS PINK MATERIAL WITHIN
A SPIRAL ARRANGEMENT CALLED A “KERATIN PEARL”
CONCENTRIC LAYERS OF KERATIN-CINTAINING CELLS IN A WELL-DIFFERENTIATED SQUAMOUS CARCINOMA
AS THE TUMOUR BECOMES LESS WELL DIFFERENTIATED ONLY SOME OF THE CELLS SHOW KERATIN FORMATION AND-INTER-CELLULAR BRIDGE FORMATION
POORLY OR UNDIFFERENTIATED TUMOURS, WHETHER SQUAMOUS OR GLANDULAR IN ORIGIN CONSIST OF SHEETS OF UNDIFFERENTIATED CELLS WITH NUMEROUS AND OFTEN ABNORMAL MITOTIC FIGURES
IN ADENO-CARCINOMAS THE DEGREE OF GLANDULAR STRUCTUREFORMATION WILL DETERMINE THE DEGREE OF DIFFERENTIATION
ADENOCARCINOMA – THE GLANDULAR ACINI ARE WELL- FORMED IN THIS WELL DIFFERENTIATED
TUMOUR
ANAPLASTIC CARCINOMA – i.e. POORLY OR UNDIFFERENTIATED TUMOUR WITH NUMEROUS MITOTIC
FIGURES ()
BREAST MASS EXCISED AT SURGERY. THE CUT SURFACE SHOWS THE TYPICAL YELLOWISH-WHITE TUMOUR TISSUE INFILTRATING THE
SURROUNDING FIBRO-FATTY BREAST TISSUE
NORMAL BREAST TISSUE INFILTRATING CARCINOMA
FAIRLY SOLID SHEET OF TUMOUR CELLS WITH SOME DUCTAL DIFFERENTIATION
Tumour Grading
Grade Score 5-year survival (%) 7-year survival (%)
1 3 – 5 95 90
2 6 – 7 75 65
3 8 - 9 50 45
Staging
• A uniform TNM system for staging cancer according to its anatomic extent at the time of diagnosis is extremely useful for many reasons, chiefly for comparing treatment results from different centres
4) Tumour Staging• Measure of prognosis• TNM classfication
T(umour size)N(ode numbers)
M(etastasis)• [Dukes and Astler-Coller
Large intestine – see later]
STAGE Definition 5-year % survival
7-year % survival
I < 2cm without nodal or regional mets
96 92
II > 2 < 5 cm with +ve nodes OR > 5 cm without nodes
81 71
III Any size but with fixation to skin, chest wall, etc
52 39
IV Tumour any size but distant metastases 18 11
5) Prognosis• Depends on grade and stage• Also tumour type – NB breast, lung,
melanoma (very unpredictable)• Site VIP (superficial vs. deep visceral)• Immune status, nutrition, pain threshold,
etc • (No evidence that “positive thinking,”
homeopathy and miracles can cure cancer!!)• General principle, earlier/smaller tumours
have better prognosis – therefore:• Importance of surveillance programs – PAP
smears, mammography, PSA, colonoscopy
Spread of Tumours• Local invasion
• Lymphatic spread
• Haematogenous
• Transcoelomic
• Implantation
• Fascial planes, ducts,
• Carcinoma. Permeation and embolisation. Retrograde spread
• Sarcomas. Early to lung
• Pleura, peritoneum, meninges. Example is Krukenberg tumour
• Rare due to good surgical practice
CARCINOMA• Majority (90%) of malignant tumours• Prevalence increases with age (cf
sarcoma)• Variable geographic differences (cf
sarcoma)• “ENVIRONMENTAL” (cf sarcoma)• NB. All epithelia have a basement
membrane therefore• Always a defined “pre-malignant”
phase• = DYSPLASIA (mild, moderate, severe)
PROGNOSIS OF A MALIGNANT TUMOUR
Text
ADENO-CARCINOMA SHOWING GLAND FORMATION
CIN III/SEVERE DYSPLASIA CA-IN-SITU