Oncology Drugs Flashcards
What is the mechanism of action of Alkylating agents?
Cause intra- and inter-strand cross-links between DNA bases
What drugs are in the category of Alkylating agents?
Cyclophosphamide Dacarbazine (DTIC) Ifosfamide Mechlorethamine Melphalan Nitrosureas Procarbazine Temozolamide
The metabolites of which Alkylating agents are toxic to the bladder and how can you protect against this toxicity?
Cyclophosphamide
Ifosfamide
Use hydration + MESNA
Which Alkylating agents penetrate the CNS?
Nitrosoureas
Procarbazine
Temozolamide
What Alkylating agent is the parent drug of the class?
Mechlorethamine - nitrogen mustard gas
What is the mechanism of action of the Platinum derivative drugs?
Cross-link DNA
What drugs are in the category of Platinum derivative drugs?
Carboplatin
Cisplatin
Oxaliplatin
For each of the Platinum derivative drugs (Carboplatin, Cisplatin, Oxaliplatin), rank the following toxicities in order from greatest to least:
Renal
Neuro
Heme
Carboplatin = Heme >>>> Renal/Neuro Cisplatin = Renal > Neuro > Heme Oxaliplatin = Neuro >> Heme >>>> Renal
What is the mechanism of action of Anti-tumor antibiotics?
Damage DNA physical structure by intercalating into DNA helix and alter DNA function by inhibiting RNA/protein synthesis
What drugs are in the category of Anti-tumor antibiotics?
Actinomycin D
Bleomycin
What cancer is Acitnomycin D a curative regimen for?
Pediatric cancers
What are toxicities of Acinomycin D?
Myelosuppression
Nausea/vomiting/diarrhea
Muscositis
Radiation recall
What are toxicities of Bleomycin?
Pulmonary and cutaneous toxicity, especially with decreased renal function
Can persist in lung and cause fatal recall of lung toxicity during surgery with high O2 inspired
Why does Bleomycin cause pulmonary and cutaneous toxicity, especially with decreased renal function?
Tissues clear it with bleomycin hydrolase - but lungs and skin lack this hydrolase
Therefore, if renal clearance of the drug is decreased, the drug can build up in lungs and skin, causing toxic effects
What is the mechanism of action of the Topoisomerase directed agents?
Forms a complex of the drug, enzyme, and DNA and the drug stabilizes the break, preventing repair and altering function
What are the Topoisomerase I directed agents?
Irinotecan
Topotecan
What are the Topoisomerase II directed agents?
Anthracyclines - Doxorubicin, Daunorubicin, Idarubicin
Mitoxantrone
Etoposide
What are toxicities of Irinotecan?
2 types of diarrhea - Early = atropine sensitive - Late = reflecting enterohepatic clearance Myelosuppression Nausea/Vomiting/Fatigue/Alopecia
What are toxicities of Topotecan?
Nausea/Vomiting/Fatigue/Alopecia
Myelosuppression
What are toxicities of anthracyclines (Doxorubicin, Daunorubicin, Idarubicin)?
Myelosuppression
Mucositis
Alopecia
Cardiac toxicity due to free radical generation (but Idarubicin less cardiotoxic)
How are the anthracyclines (Doxorubicin, Daunorubicin, Idarubicin) cleared and when must you dose adjust?
Cleared by liver
Adjust in hepatic failure
What drugs are in the category of antimetabolites?
Methotrexate 5-Fluorouracil Cytaracine Gemcitabine Fludarabine Mercaptopurine Pentostatin
What is the mechanism of action of methotrexate?
Folate inhibitor
Inhibits dihydrofolate reductase, blocking DNA/RNA formation
What are the side effects of methotrexate?
At standard dose - myelosuppression, mucositis
At high doses - intentionally give lethal dose, but with leucovorin (to rescue normal cells)
What is the mechanism of action of 5-Fluorouracil?
Pyrimidine analog
Inhibits thymidine synthesis by forming complex with folate and thymidylate synthase
What are the side effects of 5-Fluorouracil?
Myelosuppression
GI
Cerebellar/neurocognitive
Rare coronary spasm
What can be used to enhance the toxicity of 5-FU to cancer cells?
Leucovorin
Enhances complex of thymidilate synthase + folate +5-FU
What is the mechanism of action of cytarabine (Ara-C) and Gemcitabine?
Cytosine analog
Inhibits DNA synthesis
What are the side effects of Cytarabine and Gemcitabine?
Myelosuppression
Cerebellar effects
Eye irritation
Hand/foot syndrome - prominent with gemcitabine
What antimetabolite drugs are the purine analogs?
Fludarabine
Mercaptopurine
What is the mechanism of action of pentostatin?
Behaves like a purine analog
Not incorporated into DNA directly, inhibits adenosine deaminase and signals apoptosis in T cells
What is the mechanism of action of asparaginase?
Clears circulation of asparagine
Decreases protein synthesis in susceptible cells types and indirectly damages DNA
What are some side effects of asparaginase?
Hypersensitivity
Hyperglycemia
Pancreatitis
Altered clotting functions
What is the mechanism of action of Hydroxyurea?
Reversible inhibition of ribonucleotide reductase by chelation of non-heme Fe
–> decreased dNTP pools –> stalled replication –> apoptosis
What are some side effects of hydroxyurea?
Myelosuppression
Mucositis
What are the microtubule directed cytotoxic agents?
Vincristine
Vinblastine
Paclitaxel
Dacitaxel
What is the mechanism of action of vincristine and vinblastine?
Mitotic inhibitor - blocks mitosis
What are the toxicities of vincristine and vinblastine?
Vincristine - neurotoxic > myelosuppression
Vinblastine - myelosuppression > neurotoxic
What is the mechanism of action of Paclitaxel and Docitaxel (taxanes)?
Microtubule polymerstabilizers
Promote microtubule formation but are abnormal and shortened; do not function normally
What are toxicities of Paclitaxel and Docitaxel?
Myelosuppression
Neuropathy
Fluid retention - vascular leak
Hypersensitivity reactions
What is the mechanism of action of arsenical?
Generate free radicals
What are side effects of arsenic?
Heavy metal toxicity - kidney, cardiac conduction (QT prolongation)
What are the hormonal oncologics?
Goserelin Tamoxifen Letrozole Examestane Prednisone
What is the mechanism of action of Goserelin?
LHRH analog
Decrease LH release by pituitary and decrease testosterone production
What is the mechanism of action of Tamoxifen?
Estrogen receptor antagonist
What is the mechanism of action of Letrozole?
Type II aromatase inhibitor
Non steroidal - target P450 aromatase
What is the mechanism of action of Examestane?
Type I aromatase inhibitor
Steroidal - target substrate binding site
What is the mechanism of action of prednisone?
Glucocorticoid receptor action induces apoptosis in lymphoid tissue
What is the mechanism of action of tretinoin (all trans retinoic acid)?
Induces differentiations of leukemia cells bearing translocation t(15;17) that alters structure & function of retinoic acid
What are side effects of all trans retinoic acid?
Teratogenic
Cutaneous (dry skin, ocular kaeratitis)
Increased intracranial pressure
Differentiation syndrome
What is differentiation syndrome?
Cytokine storm in APL after all trans retinoic acid
Presents with fever, peripheral edema, pulmonary opacities, hypoxemia, respiratory distress, hypotension, etc.
What drug should be given to control differentiation syndrome?
Dexamethasone (steroids)
What drugs are in the category of tyrosine kinase inhibitors and what is the target for each?
Imatinib - BCR-ABL
Erlotinib - EGF receptor
Sorafenib - multitarget (VEGF, raf, others)
Sunitinib - multitarget (VEGF, raf, others)
What are side effects of Imatinib?
Cytopenias
Liver abnormalities
Fluid retention
Rare cardiomyopathy
What are side effects of Erlotinib?
Diarrhea
Cutaneous
What are side effects of Sorafenib, Sunitinib?
Hypertension
Proteinuria
Clotting/bleeding
What are side effects of Interferon?
Fatigue
Cytopenia
Fever, chills
What is mechanism of action of Interleukin-2?
Induces T cell response, cytolytic for tumors
What are side effects of Interleukin-2?
Hypotension
Vascular leak
Altered mental status
Cardiopulmonary effects
What drugs are antibodies and what is their target?
Cetuximab - anti-EGFR
Trastuzumab - anti-Her2/neu
Rituximab - anti-CD20
What are side effects of antibodies?
Infusion reaction = fever, chills, hypotension, bronchospasm
What drug is an antiangiogenic agent?
Bevacuzimab
Anti-VEGF monoclonal antibody that prevents angiogenesis
What are treatments of choice for AML?
High dose Cytarabine (Ara-C) and Danorubicin (anthrocycline)
What are major side effects of AML treatment with Cytarabine and Danorubicin?
Tumor lysis syndrome
Cytarabine-induced cerebellar toxicity
Cardiomyopathy due to anthracycline
What are treatments of choice for APL?
All trans retinoic acid, arsenic
What are major side effects of APL treatment with all trans retinoic acid or arsenic?
Differentiation syndrome due to all trans retinoic acid
What are treatments of choice for CML?
Imatinib
What are major side effects of CML treatment with Imatinib?
Resistance to imatinib
What are treatments of choice for ALL?
Asparaginase
Intrathecal chemo
PCP prophylaxis
Cryoprecipitate
What are major side effects of ALL treatment with Asparaginase?
Allergic reaction, thrombosis, pancreatitis
What are treatments of choice for CLL?
Wait and see
What are treatments of choice for Hodgkin’s lymphoma?
ABVD combination chemo +/- radiation A - Adriamycin (Doxorubicin) B - Bleomycin V - Vinblastine D - Dacarbazine
What are major side effects of Hodgkin’s treatment with ABVD?
Doxorubicin - cardiac toxicity
Bleomycin - pulmonary toxicity
Myelosuppression
Nausea/Fatigue/Vomiting
What are treatments of choice for DLBCL (diffuse large B-cell lymphoma)?
R-CHOP +/- radiation Rituximab (CD20 antibody) Cyclophosphamide Doxorubicin Vincristine Prednisone
What are major side effects of treatment with R-CHOP?
Rituximab - infusion reaction
Cyclophosphamide - bladder toxicity, at high doses also cardiac toxicity and lung toxicity
Doxorubicin - cardiac toxicity
Vincristine - neurotoxicity, myelosuppression
Prednisone
What are treatments of choice for follicular lymphoma?
Close surveillance
Treat if symptomatic
Drugs of choice are controversial
What are treatments of choice for MALT lymphoma?
Triple therapy for H. pylori
What are treatments of choice for T cell non-Hodgkin lymphoma?
CHOP Cyclophosphamide Doxorubicin Vincritine Prednisone
What are treatments of choice for multiple myeloma?
Multiagent therapy with Bisphosphate therapy