Session 8 Lecture 1 Flashcards Preview

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Flashcards in Session 8 Lecture 1 Deck (35)
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1
Q

Define neoplasm

A

An abnormal growth of cells that persists after the initial stimulus is removed.

2
Q

Define malignant neoplasm

A

An abnormal growth of cells that persists after the initial stimulus is removed AND invades surrounding tissue with potential to spread to distant sites.

3
Q

Define tumour

A

Any clinically detectable lump or swelling.

4
Q

What is cancer?

A

Any malignant neoplasm

5
Q

Define metastasis

A

Malignant neoplasm that has spread from its original site to a new non contiguous site.

6
Q

What is dysplasia?

A

Pre-neoplastic alteration in which cells show disordered tissue organisation.

7
Q

What is the main different between neoplasm and dysplasia?

A

Neoplastic - irreversible

Dysplasia - reversible

8
Q

What is a benign neoplasm?

A

Remaines confined to their site of origin and do not produce metastases.

9
Q

What is a malignant neoplasm?

A

Has the potential to metastasise.

10
Q

What does a benign tumour look like to the naked eye?

A

Grows in a confined local area and so have a pushing outer margin.

11
Q

What does a malignant tumour look like to the naked eye?

A

Have an irregular outer margin and shape and may show areas of necrosis and ulceration.

12
Q

Give an example of when a benign tumour an be very detrimental

A

If it is in the brain, it can compress and therefore affect certain areas.

13
Q

Define anaplastic

A

Cells with no resemblance to any tissue i.e. are very poorly differentiated

14
Q

Are benign neoplasm cells well differentiated or not?

A

Yes - well differentiated

15
Q

What happens to the cell with worsening differentiation?

A

Individual cells have increasing nuclear size and nuclear to cytoplasmic ration, increased nuclear staining, more mitotic figures and increasing variation in size and shape of cells and nuclei.

16
Q

What is hyperchromasia?

A

Increased nuclear stating usually due to increased DNA content.

17
Q

What is pleomorphism?

A

The variation in size and shape of cells and nuclei

18
Q

What do clinicians use the term “grade” for?

A

Use it to indicate differentiation

19
Q

What does ‘high grade’ mean?

A

Poor differentiation

20
Q

Compare the prognosis of a high grade to a low grade?

A

High grade - poor prognosis

Low grade - good prognosis

21
Q

What is dysplasia a precursor for?

A

Precursor to carcinoma in situ (stays in the basal membrane)

22
Q

What do mild, moderate and severe dysplasia indicate?

A

Indicate worsening differentiation

23
Q

What causes neoplasm?

A

Accumulated mutations in somatic cells

24
Q

What causes mutations?

A

Caused by initiator, which are mutagenic agents, and promotes, which cause cell proliferation.

25
Q

In combination, imitators and promotors result in……….

A

An expanded monoclonal population of mutant cells

26
Q

What is the process called ‘progression’?

A

A neoplasm emerges from this monoclonal population through a process called progression. This is characterised by the accumulation of yet more mutations.

27
Q

Describe briefly the process of neoplasm

A

Initiation, promotion, progression then neoplasm.

28
Q

What is meant by monoclonal?

A

A collection of cells is monoclonal is they all originate from a single founding cell.

29
Q

Are neoplasms monoclonal?

A

Yes

30
Q

What is lyonisation?

A

In early female embryogenesis, one allele is randomly inactivates in each cell

31
Q

What particular types of genes do genetic alterations affect?

A

Proto-oncogenes and tumour supressor genes

32
Q

What happens to photo-oncogenes when they are genetically altered?

A

They become abnormally active (when they are called oncogenes), favouring neoplasm formation.

33
Q

What happens to tumour suppressor genes when they are genetically altered?

A

They normally suppress neoplasm formation however they become inactivated.

34
Q

When naming a neoplasm, what type end in -oma?

A

Benign neoplasm

35
Q

When naming a neoplasm, what type ends in - carcinoma?

A

Malignant neoplasm