Anticancer Drugs Flashcards
What is the Log kill hypothesis.
Theory that cytotoxic drugs kill fixed percentage of tumor cells not a fixed number. Follow 1st order kinetics.
What is growth fraction meaning.
tumors with high turn over
Name a few cytotoxic agents that are S phase specific.
- cytarabine
- 6-mercaptopurine
- 6-thioguanine
- 5-FU
- methotrexate
- hydroxyurea
- irinotecan (blocks topoisomerase I)
- etoposide (blocks topoisomerase II)
Name some cytotoxic agents that are non-cell cycle specific.
- alkylating agents (cyclophosphamide, cisplatin, procarbazine)
- antitumor antibiotic (doxorubicin, daunorubicin)
- nitrosoureas (lomustine, carmustine)
What are the cytotoxic agents that inhibit the M phase of the cell cycle?
vinblastine
vincristine
* blocks tubular polymerization
Paclitaxel
(blocks depolymerization of microtubules)
colchicine and griseofulvin also act via this mechanism
What are the cytotoxic agents that act by inhibiting the G2 phase of the cell cycle?
Bleomycin (antibiotic)
What is the MOA of cyclophosphamide?
alkylating agent basically alkylates DNA by attacking guanine N7 - dysfunctional DNA
S/E of cyclophosphamide?
BMS, hemorrhagic cystitis
Antidote cyclophosphamide toxicity? How does it work?
mesna which traps the toxic metabolite acrolein and is protective
Uses for cyclophosphamide?
really it is used for many conditions including but not limited to non hodgkin lymphoma, ovarian, breast cancer, neuroblastoma
MOA cisplatin?
alkylating agent- cross-links DNA strands
Indications for cisplatin?
testicular, ovarian, bladder, lung cancer
S/E of using cisplatin?
nephrotoxicity; neurotoxicity (deafness)
What drug would you use to protect the kidneys for the nephrotoxic side effects of using cisplatin?
amifostine
What is the MOA procarbazine?
alkylating agent
Indication procarbazine?
Hodgkin
S/E of procarbazine?
BMS, leukemogenic
MOA Doxorubicin?
Intercalator (meaning it can insert mini grooves in DNA and cause DNA strand breaks), forms free radicals, inhibits topoisomerase
Indications Doxorubicin?
Hodgkin, breast, endometrial, lung, and ovarian cancers
S/E doxorubicin?
BMS - delayed CHF
Antidote to cardio toxicity caused by doxorubicin?
dexrazoxane which is an iron-chelating agent that prevents the formation of free radicals; it is not a free radical “trapper”
Methotrexate MOA?
antimetabolite- inhibits DHF reductase (S phase)
Indications for methotrexate?
leukemias, lymphomas, breast cancer; rheumatoid arthritis, psoriasis
S/E methotrexate use?
BMS
Antidote for methotrexate?
folinic acid (leucovorin rescue)
What is the S/E of 5-FU?
BMS
MOA Capecitabine?
pyrimidine antimetabolite (S phase) bio activated to inhibit thymidilate synthetase
S/E capecitabine?
BMS
Indications capecitabine?
breast, ovarian, head and neck cancer, topical for basal cell cancer and keratoses; colorectal cancer
6-mercaptopurine MOA.
purine antimetabolite bio activated by HGPR transferase.
Indications for 6-mercaptorpurine.
acute lymphocytic leukemia; immunosuppression
S/E 6 mercaptopurine.
BMS
Bleomycin MOA?
complexes with Fe and O2 > DNA strand scission
Indications bleomycin?
Hodgkin, testicular, head, neck, skin cancer
S/E bleomycin
pneumonitis, pulmonary fibrosis
VInblastine MOA.
dec micro tubular polymerization (spindle poison)
Vincristine MOA.
dec micro tubular polymerization (spindle poison)
Indication vinblastine.
Hodgkin, testicular cancer, Kaposi
Indication Vincristine.
Hodkin, leukemias, Wilms
VInblastine S/E?
BMS
Vincristine S/E?
neurotoxicity
MOA All-trans retinoid acid (ATRA)
differentiating agent, promotes differentiation of promyelocytes
Indication for ATRA?
acute myelogenous leukemia (AML) M3
S/E of ATRA?
differentiation syndrome with respiratory distress, pleural and pericardial effusions, CNS symptoms
Target of Imatinib
BCR-ABL (treats CML, GI stromal tumors GIST)
Cetuximab target?
ErbB1 (head and neck and colon cancer)
Trastuzumab target?
ErbB2 (HER2/neu) (breast cancer)
Bevacizumab target?
VEGF-A
Sorafenib target?
RAF kinase
What are the more marrow sparing cytotoxic medications?
cisplatin, bleomycin, vincristine
Popular nephrotoxic medications cytotoxic?
cisplatin, methotrexate
Popular cytotoxic medications implicated in pulmonary toxicity?
bleomycin, busulfan, procarbazine
Popular cardiotoxic cytotoxic meds?
Doxorubicin, daunorubicin
Popular neurotoxic cytotoxic meds?
Vincristine, cisplatin
Popular immunosuppressive cytotoxic meds?
cyclophosphamide, methotrexate
What asparaginase causes what notable side effect?
pancreatitis
CSF, erythropoietin and thrombopoietin therapy can be supportive in care for cancer in what way?
helps to reduce infections and need for antibiotics
Aldesleukin MOA
IL-2 analog; inc. lymphocyte differential and inc. NKs
Indication aldesleukin?
used in renal cell cancer and metastatic melanoma
Interleukin 11 indications.
inc. platelet formation used in thrombocytopenia
Filgrastim MOA
G-CSF inc. granulocytes
Filgrastim indications?
marrow recovery
Sargramostim indications.
inc. granulocytes and macrophages - used for marrow recovery
MOA Sargramostim?
GM-CSF
Erythropoeitin indications.
anemia, especially associated with renal failure
Thrombopoietin indications.
thrombocytopenia