neoplasia ii: tumor characteristics · neoplasia ii: tumor characteristics. tumor characteristics...
TRANSCRIPT
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Neoplasia II: Tumor Characteristics
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Tumor Characteristics Lecture Objectives
• Define tumor differentiation, and explain the difference between well-differentiated, moderately-differentiated, and poorly-differentiated tumor cells.• Define anaplasia, and describe what anaplastic cells typically
look like.• Define dysplasia, describe what dysplastic cells look like, and
explain why it matters whether cells are mildly, moderately, or severely dysplastic.• Explain what “growth fraction” means, and list some factors
that affect a tumor’s growth fraction.• Describe the three ways tumors metastasize.• Compare and contrast grading and staging (just know what
they are...don’t memorize tiny details!)
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Tumor Characteristics Lecture Outline
• Differentiation, dysplasia, and anaplasia• Rate of growth• Metastasis• Grading and staging
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• Differentiation, dysplasia, and anaplasia
Tumor Characteristics Lecture Outline
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Differentiation
• Well-differentiated: closely resemble• Moderately-differentiated: sort of resemble• Poorly-differentiated: barely resemble
Differentiation = the degree to which tumor cellsresemble their cell of origin
Benign tumors are usually well-differentiatedMalignant tumors can show any level of differentiation
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Thyroid adenoma, well-differentiated
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Squamous cell carcinoma, well-differentiated
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Intercellular bridges
Squamous cell carcinoma, poorly-differentiated
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• Literally, “to grow (-plasia) backwards (ana-)”
• Means tumor cells do not resemble their cell of origin at all
• Almost always indicates malignancy
Anaplasia
Anaplasia = a state of complete un-differentiation
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Characteristics of Anaplastic Cells
• Pleomorphism
• Hyperchromatic, large nuclei
• Bizarre nuclear shapes, distinct nucleoli
• Lots of mitoses, and atypical mitoses
• Architectural anarchy
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Anaplastic carcinoma
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Lots of mitoses
Abnormal mitoses
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• Used to describe changes in non-neoplastic epithelial cells
• Graded as mild, moderate, or severe
• Next step after severe dysplasia is carcinoma in situ
• ...and the next step after that is invasive carcinoma
Dysplasia
Dysplasia = disorderly (dys-) growth (-plasia)
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Dysplastic cells show:
• Pleomorphism
• Hyperchromatic, large nuclei
• Lots of mitoses
• Architectural anarchy
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Q. Wait a minute, “dysplasia” sounds suspiciously similar to “differentiation” – what’s the difference?
A. Both terms describe whether cells look normal or not!
BUT:
Dysplasia is used to describe non-neoplastic cells, and differentiation is used to describe neoplastic cells.
Dysplasia is used to describe epithelial cells, and differentiation can be used to describe any cell type.
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mild dysplasia
moderate dysplasia
severe dysplasia
Non-neoplastic epithelial cells
carcinoma in situ
Dysplasia
well-differentiated
moderately-differentiated
poorly-differentiated
anaplastic
Neoplastic cells
Differentiation
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Normal glandular epithelium
Mild dysplasia Moderate dysplasia Severe dysplasia
Crowding
Hyperchromatic nuclei
Architectural anarchy Pleomorphism
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Invasive carcinoma
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• Differentiation, dysplasia, and anaplasia• Rate of growth
Tumor Characteristics Lecture Outline
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Generalizations about Tumor Growth
• Malignant tumors grow faster than benign ones.
• Poorly-differentiated tumors grow faster than well-differentiated ones.
• Growth is dependent on:• Blood supply• Hormonal factors• Emergence of aggressive sub-clones
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Growth Fraction
• Growth fraction (GF) = % of tumor cells that are dividing• Age of tumor matters
• Early on (subclinical), GF high. • Later (clinically detectable), GF low.
• Type of tumor matters• Leukemias, lymphomas, small-cell lung cancer: high GF• Breast, colon cancer: low GF
• Important for treatment• High GF tumor: treat with chemotherapy/radiation• Low GF tumor: treat by debulking
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Tumor Characteristics Lecture Outline
• Differentiation, dysplasia, and anaplasia• Rate of growth• Metastasis
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Metastasis
Half of all patients with malignancies have mets at the time of diagnosis!!
The speed and location of metastasis is related to:• Type of tumor • Size of tumor• Degree of differentiation of tumor
Metastasis = development of secondary tumor implantsin distant tissues
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Liver with multiple metastases
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Three Ways Tumors Metastasize
SeedingLymphatic spreadHematogenous spread
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Three Ways Tumors Metastasize
Seeding• Tumor floats through a body cavity • Bits break off and implant on peritoneal surfaces• Ovarian cancer can spread easily this way
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Liver seeded with metastatic ovarian carcinoma
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Three Ways Tumors Metastasize
SeedingLymphatic spread
• Tumor spreads through lymphatics• Sentinel lymph node first• Carcinomas prefer to spread this way
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Tumor in lymphatic
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Tumor in lymph node
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Tumor in lymph node
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Three Ways Tumors Metastasize
SeedingLymphatic spreadHematogenous spread
• Tumor spreads through blood vessels• Liver and lungs are the most common destinations• Sarcomas prefer to spread this way
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Sarcoma metastatic to lung
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Neoplasia Outline
• Differentiation, dysplasia, and anaplasia• Rate of growth• Metastasis• Grading and staging
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Grading and Staging
• Used for malignant tumors• Useful for determining treatment and prognosis• Grading
• Tells you how nasty the tumor looks• Use microscope• Can be useful in some tumors
• Staging• Tells you how far the tumor has spread • Use imaging• Very useful in most tumors
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Grading system for breast cancer
Tubuleslots of tubules some tubules rare tubules
123
Mitoses0-9 mitoses/10 hpf10-19 mitoses/10 hpf≥20 mitoses/10 hpf
123
Pleomorphismsmall, uniform cells larger, less uniform cellsmarkedly pleomorphic cells
123
3-5
add all points together
Low grade
GradeScore 5y survival
>95%6-78-9
Intermediate gradeHigh grade
80%60%
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Breast carcinoma low grade
tubules
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Breast carcinoma high grade
pleomorphism
mitoses
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T = Tumor sizeTis – in situ tumor T1 – small tumorT2 – larger tumorT3 – larger or invasive tumorT4 – very large/very invasive
N = NodesN0 – no lymph node involvement N1 – a few regional nodesN2 – lots of regional nodesN3 – distant nodes
M =MetastasesM0 – no metastases M1 – metastases
TNM staging system for non-small cell lung cancer
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Stage 0
Stage I
Stage II
Stage III
Stage IV
TNM staging system for non-small cell lung cancer
Tis
T1 or T2
T1T2T3
T1 or T2T3
Any TT4
Any T
N0
N0
N1N1N0
N2N1 or N2
N3Any N
Any N
M0
M0
M0M0M0
M0M0M0M0
M1
Surgery only
Surgery ± radiation
Surgery and radiation± chemotherapy
Chemotherapy ±radiation to debulk
Maybe surgery
Palliative careMaybe chemo or radiation
75%
50%
30%
10%
<2%
Stage T N M Treatment 5y survival