Haematology 10 - Lymphoma 1: multidisciplinary Flashcards
What is multiple myeloma a malignancy of?
Plasma cells
Why do bacterial infections and autoimmune disorders increase lymphoma risk?
Constant antigenic stimulation
Why do viral infections increase lymphoma risk?
Direct viral integration of lymphocytes
Which lymphoma does Sjorgen’s syndrome increase risk of?
Marginal zone lymphoma of the parotid
Which lymphoma does Hashimoto’s syndrome increase risk of?
Marginal zone lymphoma of the thyroid
How is HTLV1 transmitted, and which cancer does it increase risk of?
A retrovirus that is transmitted at birth, and increases risk of adult T cell leukaemia lymphoma
Which type of cells are infected by EBV?
B cells
How are EBV-expressing B cells usually eliminated?
Cytotoxic T cell function
What type of lymphoma does h pylori infection predispose to?
Gastric MALT
Burkitt lymphoma expresses high level of c-myc oncoprotein, why?
Recombination error: on chromosome 14
IgH promotor usually promotes Ig heavy chain production
Mutation in IgH promoter –> c-myc promotion
Mutation is t(8;14)
What are the 2 broad subtypes of Non-Hodgkins lymphoma?
B and T cell type
What are the subtypes of B cell NHL?
Low grade: follicular, small lymphocytic, marginal zone
High grade: diffuse large cell, Burkitt’s
Aggressive: mantle cell
What test can prove germinal centre origin of a lymphoma?
Positive staining for CD10 and bcl6 (Follicular, DLBCL, Burkitts lymphomas)
What is the classification of Burkitt’s lymphoma
High grade peripheral B cell lymphoma
What gene mutation is associated with follicular lymphoma?
t(14;18) - it causes overexpression of the bcl-2 gene
Which lymphoma typically has a ‘starry sky appearance’ on histology?
Burkitt’s lymohoma
Where does TCR gene recombination occur?
Thymus
What are the key enzymes involved in VDJ (TCR gene) recombination?
RAG1 and RAG2