Chemotherapy - Block 4 Flashcards
Define dose limiting toxicity?
A toxicity that may lead to a dosage decrease, tx delay, or discontinuation
Is hair loss a DLT?
No
Factors that contribute to dosage adjustment?
- Patient hx
- Cure vs prolongation of life
- Renal and hepatic dysfunction
MOA of antimetabolites??
Mimic nucleotides that disrupt replication and cell division
What are the classes of antimetabolites?
- Pyrimidine analogs
- Purine analogs
- Folate antagonists
What are the class toxicities for antimetabolites?
- Myelosuppression
- Diarrhea
What are the types of pyrimidine analogs?
- 5FU
- Capecitabine
- Cytarabine
- Gemcitabine
DLT for 5-FU?
- Stomatitis
- Myelosuppression
- Diarrhea
- Hand foot syndrome
DLT for capecitabine?
- Diarrhea
- Hand foot syndrome
What drug enhances activity and toxicity of 5-FU?
Leucovorin
What patient factor contributes to increased toxicity of pyrimidine analogs?
DPD deficiency
DDI of pyrimidine analog
Warfarin
DLT of cytarabine?
- Leukopenia
- Thrombocytopenia
What drug is sometimes given with allopurinol to prevent TLS?
6-MP (dose must be decreased to avoid toxicity)
DLT of methotrexate?
- Myelosuppression
- Mucositis and diarrhea
DLT of pemetrexed?
Neutropenia
What medication is given for methotrexate tox?
Leucovorin
What is the reversal agent for methotrexate nephrotoxicity?
Glucarpidase
Counseling for pemetrexed administration?
Give folic acid, B12, and dexamethasone
Examples of folate antagonists?
- Methotrexate
- Pemetrexed
What is the class toxicity for microtubule-targeting agents?
Peripheral neuropathy
What are the types of taxanes?
Paclitaxel (Taxol)
Paclitaxel NAB (Abraxane)
Docetaxel (Taxotere)
DLT of paclitaxel?
PN
DLT of paclitaxel NAB?
Myelosuppression
Which of the taxanes require pre-medication to avoid hypersensitivity?
Paclitaxel (diphenhydramine, steroid, H2RA)
Docetaxel (steroids prior to admin)
Are paclitaxel and paclitaxel NAB dosages interchangable?
No
What patient population requires taxane dosage adjustments?
Hepatic impairment
Type of epothilones? DLT?
Ixabepilone: PN and leukopenia
Example of non taxane microtubule inhibitors? DLT?
Eribulin: neutropenia
What do you give to pre-medicate when using ixabepilone?
Benadryl, H2RA, dexamethasone (if had previous rx)
Metabolism of ixabepilone?
CYP3A4
What are the types of vinca alkaloids?
- Vincristine
- Vinorelbine
- Vinblastine
What is the max dose of vincrisitne?
2 mg/dose