Flashcards in Neoplasia 1 Deck (27)
Define a Tumour
Define a Neoplasm
Define a Metastasis
Tumour: A clinically detectable lump or swelling
Neoplasm: An abnormal growth of cells that persists after the initial stimulus is removed
Cancer: A malignant neoplasm
Metastasis: A malignant neoplasm that has spread from its original site to a new non-contiguous site
Compare Primary and Secondary Sites of a malignant neoplasm
Primary site: Original location of the malignant neoplasm
Secondary site: Place to which a malignant neoplasm has spread (Metastasis)
Compare the Behaviour of a Benin and Malignant Neoplasm
- Remain confined to their site of origin and do not produce metastases
- Invade distant sites and can metastasise
Compare the Apperance to the Naked Eyes (Macroscopic features) of Benign and Malignant Neoplasms
- Grow in a confined local area
- Have a pushing outer margin
- Rarely dangerous (due to location)
- Irregular outer margin and shape
- May have ulcerations and necrosis
Compare the Microscopic appearances of Benign and Malignant neoplasms
What are Anaplastic cells
- Closely resemble the parent tissue( are well differentiated)
- Range from well to poorly differentiated
Cells with no resemblance to any tissue
How do the following change with worsening differentiation;
1. Nuclear size
2. Nuclear to cytoplasmic size
3. Nuclear staining
4. Mitotic figures (Lacking a nuclear membrane, hairy projections of chromosomes)
5. Size and shape of cells and nuclei
3. Increase (Hyperchromasia)
4. More + Abnormal
5. Increased variation (Pleomorphism)
What term do clinicians use to indicate differentiation of a tumour
What does Mild, Moderate and Severe dysplasia indicate
Grade (High grade= poorly differentiated)
Indicates worsening differentiation
Compare Invasive and In-Situ malignancy
Invasive: Breach of basement membrane
In-situ: Basement membrane not breached
What causes Neoplasia
What 2 things cause these? What do they do?
Accumulated mutations in somatic cells
Initiators: Cause mutations
Promotors: Cause cell proliferation
What is the result of a combination of Initiators and Promotors
By what process does this lead to a Neoplasm forming?
What characterises this process?
An expanded monoclonal population of mutant cells
Progression, characterised by accumulation of more mutations
Name the 3 main initiators/ promoters that cause a neoplasm
What is another way cells can be mutated
- Chemicals (Smoking/ Alcohol/ Diet and Obesity)
- Infections (HPV)
- Inherited mutations
What 4 types of genes are affected by genetic alterations, leading to mutations.
1. Proto-oncogenes (Growth promoting)
2. Tumour suppressor genes (Growth inhibiting)
3. Genes that regulate apoptosis
4. Genes involved in DNA repair
How do mutations generally affect proto-oncogenes to activate them?
How do Oncogenes cause growth of the cell
Are oncogenes dominant over (normal) proto-oncogenes
Generally cause in excessive increase in 1/ more normal functions (Gain of function mutations)
Produce Oncoproteins that can promote cell growth in the absence of normal growth promoting signals
How do mutations affect Tumour Suppressor genes to lead to cancer?
How do mutations generally Apoptosis Regulating genes to cause cancer?
Loss of function mutations, leading to failure of growth inhibition
Apoptosis regulating genes may acquire abnormalities that result in less cell death, and enhanced cell survival
How do mutations affect DNA Repair genes to lead to cancer in 2 ways?
(Loss of function mutations)
1. Impair the ability of the cell to recognise and repair non-lethal genetic damage in other genes
2. Leads to cells acquiring mutations at an accelerated rate (Mutator Phenotype, marked by genomic instability)
What do Benign tumours usually end in?
What do Maligant tumours usually end in?
Benign: End in -oma
Malignant: End in -carcinoma (90% of neoplasms)/ sarcoma
Malignant tumours generally end in Carcinoma or Sarcoma. When do you use each?
What is a Papilloma?
What is an Adenoma?
Papilloma: Any benign tumour with finger-like projections
Adenoma: A benign tumour formed from glandular structures in epithelial tissue
What is Leukaemia?
What is a Lymphoma?
What is a Myeloma?
Leukaemia: A maligant neoplasm of blood cells arising in blood marrow
Lymphoma: Maligant neoplasms of lymphocytes (mainly affecting lymph nodes)
Myeloma: A Maligant neoplasm of plasma cells
What do Germ Cell neoplasms arise from?
What do Neuroendocrine tumours arise from?
Germ cell: Arise from pluripotent cells (mainly in testis or ovary)
Neuroendocrine: Arise from endocrine cells distributed throughout the body (All are malignant)
Name 1 tumour that can arise from the Testis and 1 from the Ovary
Benign Teratoma/ Dermoid cyst (A saclike growth present at birth, contains hair/ fluid/ teeth/ skin glands)
Neuroendocrine tumours can affect any organ, but in which 2 organ systems are they most common?
What do they produce
Produce excess secretory products
Name 2 conditions that can be caused by Neuroendocrine tumours secreting excess products
- (Excess serotonin, as well as others like Histamine/ Bradykinin/ prostaglandins etc. Which can be detected in blood and urine)
- More common with metastatic disease
What are 5 symptoms of Carcinoid syndrome
- Abdominal pain
Outline the classification of Neuroendocrine tumours in the gastrointestinal system
- Well differentiated Neuroendocrine tumours (Grade 1,2)
- Poorly differentiated Neuroendocrine tumours (Grade 3)
Outline the classification of neuroendocrine tumours in the respiratory system
The presence of what 2 process are key in these
A spectrum from lower grade malignant tumours to height grade carcinomas
Present of necrosis and mitotic activity is key