Lymphoma Flashcards
What is the most common hematopoietic malignancy in cats and dogs?
Lymphoma
What are risk factors for lymphoma in cats?
FeLV, immune suppression (FIV), chronic inflammation
What cat breeds are somewhat predisposed to lymphoma?
Siamese and oriental breeds
How does FeLV predispose to lymphoma?
Direct role in DNA mutation causing lymphoma
How is lymphoma usually classified in cats?
By its anatomic location
What is the most common site for lymphoma in cats?
GI
Lymphoma presenting similar to IBD is usually what grade?
Low grade, small cell, lymphocytic
What are clinical signs of low grade lymphoma in cats?
Chronic wt loss, low appetite, V+/D+
How will intestines of a low grade lymphoma cat appear on ultrasound?
Diffuse thickening
What is the prognosis for a low grade GI lymphoma in cats?
Guarded to good (survival time can be several years in some cases)
How do you treat a low grade GI lymphoma in cats?
Prednisolone and chlorambucil
What is high grade GI lymphoma?
Large cell, lymphoblastic
How will intestines of a high grade lymphoma cat appear on ultrasound?
Discrete masses or severe thickening
How do you treat high grade GI lymphoma in cats?
CHOP/COP chemotherapy
What is the MST for high grade GI lymphoma in cats if treated with chemotherapy?
6-8mo
Is mediastinal lymphoma in cats usually high or low grade?
High grade
What structures does mediastinal lymphoma affect in cats?
Thymus and sternal LNs
What are clinical signs of mediastinal lymphoma in cats?
Resp distress, pleural effusion
How common is nodal/multicentric lymphoma in cats?
Less common than in dogs
How common is nodal/multicentric lymphoma in dogs?
Most common form in dogs
What is Hodgkin’s-like lymphoma in cats?
Single or regional LNs involved @ head and neck
Where does renal lymphoma metastasize to in cats?
CNS
Is renal lymphoma in cats more often uni- or bilateral?
Bilateral
How does a nasal lymphoma present in cats?
Sneezing, epistasis, nasal discharge, and facial deformity
How do you treat a nasal lymphoma in a cat?
Radiation therapy
How do you diagnose lymphoma?
FNA, biopsy
What chemotherapy protocol is thought to be most effective for treating high grade lymphoma in cats and dogs?
CHOP, L-CHOP, COP
What chemotherapy agents are involved in CHOP protocols?
L = L-asparaginase C = Cyclophosphamide H = Doxorubicin O = Vincristine P = Pred
What is the best way to determine prognosis of a lymphoma in cats?
Response to therapy
Is lymphoma phenotype prognostic in cats?
No
What is the most common type of canine lymphoma?
Lymphoblastic high grade
What is the most common distribution of canine lymphoma?
Nodal/multicentric
What are presenting complaints that bring dogs to the clinic?
“Bumps”, lethargy
Other than LNs, what other organs are commonly enlarged with lymphoma?
Liver and spleen
How big is a lymphoblast?
2-3x size of RBC
Which canine lymphoma phenotype carries a better prognosis?
B-cell
What % of multicentric canine lymphomas are B-cell?
80%
Lymphomas that cause hypercalcemia are which phenotype?
T-cell
What mediates hypercalcemia caused by T-cell lymphomas in dogs?
Production of PTH related peptide
How is GFR affected by hypercalcemia related to T-cell lymphomas?
Isosthenuria
How many stages of canine lymphoma are there?
5
Single LN involved
Stage 1
Multiple LNs involved on same side of diaphragm
Stage 2
Multiple LNs involved on both sides of the diaphragm
Stage 3
Liver and/or spleen involvement
Stage 4
Blood, BM, other organ involvement
Stage 5
What are canine lymphoma substages?
A (clinically well) and B (clinically ill)
What is the MST for lymphoma dogs treated with CHOP chemo?
1y
What is the MST for lymphoma dogs treated with prednisone alone?
A few months
What is the MST for dogs with lymphoma that do no undergo any treatment?
2-4wk