Yellow are those that Dr. Der highlighted in lecture Class Prototype (generic Major Variants and proprietary names) Alkylating Agents Nitrogen Cyclophosphamide Methclorethamine mustards (Cytoxan, Neosar) (Mustargen) Chorambucil (Leukeran) Alkylsulfonates Ethylenimines Nitrosoureas Triazenes Platinum complex Antimetabolites Folate analogs Busulfan (Myleran) Thiotepa Carmustine (BCNU, BiCNU) Dacarbazine (DTIC-Dome) Cisplatin (Platinol) Methotrexate (Folex, Mexate) Mechanism of Action Toxicity dose limiting (others) Resistance Misc. Transfer of alkyl groups to DNA cross-linking impaired DNA replication Myelosuppression (Nausea, vomiting) -Increased DNA repair -Increased production of glutathione inactivates drug -Decreased permeability of drug -CCNS -A prodrug that requires activation by hepatic cyc P450 -Ovarian cancer, neuroblastoma uses Lomustine (CCNU, CeeNU) Semustine (methyl-CCNU) Cross-links DNA inhibits DNA replication, RNA and protein synthesis Myelosuppression (Nausea, vomiting) -Increased DNA repair -Increased production of glutathione inactivates drug -Decreased permeability of drug -Can alkylate resting cells, but cytotoxicity seen only on division -Highly lipid soluble and can penetrate into the CNS used for brain tumors Carboplatin (Paraplatin) -Thought to bind and crosslink DNA inhibits both DNA and RNA synthesis Nephrotoxicity for cisplatin Myelosuppression for carboplatin -Diminished transport -Inactivation by glutathione -Enhanced repair by unknown mechs -CCNS most toxic at G1 and S -Impt for treatment of solid tumors -Inhibits DHFR prevents formation of FH4 Inhibits DNA, RNA, protein synthesis Myelosuppression (stomatitis, erythema, rash, urticaria, alopecia, nausea, vomiting, diarrhea) -Increaed DHFR levels -Mutant DHFR with decreased MTX binding -Decreased uptake -CCS -Toxicity can be partially overcome by use of Leucovorin rescue -Used for ALL, Burkitt’s Purine analogs Mercaptopurine Thioguanine (6(6-MP, Purinethol) TG, Tabloid) Pyrimidine analogs 5-Fluorouracil (5FU, Efudex, Adrucil) Cytarabine (ara-C, Cytosar-U) Vinblastine (Velban, Velsar) Podophyllotoxins Etoposide (VePesid) Taxines Paclitaxel (Taxol) Plant Derivatives Vinca alkaloids Antibiotics Anthracyclines Doxorubicin (Adriamycin) lymphoma, breast CA -CCS -Penetrate into tumor cells and converted to unnatural nucleotides by HGPRT inhibit many enzymes in DNA, RNA synthesis -Can be incorporated into RNA and DNA DNA damage -Requires intracellular conversion to FdUMP inhibits Thymidylate synthase inhibits dTMP production -Also converted to 5-FUTP incorporated into RNA interferes with RNA function -ara-C converted to AraCTP inhibits DNA polymerase Myelosuppression (nausea, vomiting, diarrhea) -Decreased HGPRT activity -5-FU = Nausea, vomiting, diarrhea, alopecia -ara-C = myelosuppression -Increased synthesis or altered affinity of thymidylate synthase -Depletion of enzymes that activate 5-FU -Deficiency of enzyme that activates ara-C -CCS Vincristine (Oncovin, Vincasar) -Bind tubulin and prevent polymerization inhibit mitotic spindle formation inhibit mitosis -Decreased uptake and retention (MDR) -CCS, M phase specific Tenoposide (VM26, Vumon) -Binds topoisomerase II renders DNA susceptible to irreversible double-strand breaks inhibits religation -VBL myelosuppression -VCR peripheral neuropathy -Myelosuppresion (alopecia, anaphylactic reactions, nausea, vomiting) -Myelosuppression -Decreased accumulation (MDR) -CCS, S-G2 -Decreased accumulation (MDR) -Mutations in tubulin that prevent binding -CCS, M phase -Myelosuppression -Cardiac toxicity due to oxygen radical formation -Increased efflux (MDR) -CCNS, maximal activity at S and G2 -Binds tubulin and promotes polymerization stabilization of mitotic spindle cells frozen in mitosis Daunorubicin (Cerubidine) -Binds to topoisomerase II and forms covalent topoIIDNA complexes dsDNA breaks -Intercalate into DNA blocks DNA and RNA synthesis -Oxygen radical production Actinomycins Bleomycins Mitomycins Hormones Anti-estrogens Dactinomycin (Actinomycin D, Cosmegen) Bleomycin (Blenoxane) -Fe(II)-bleomycin complex forms produces free radicals single- and double-stranded DNA breaks -Pulmonary toxicity -Myelosuppression is rare -Mechanisms unknown -CCS, cells accumulate in G2 -Binds estrogen receptor inhibits its translocation to nucleus and nuclear binding blocks transcriptional activation of genes required for growth -Few toxic side effects -3-fold increased risk for endometrial cancer -Hot flashes, nausea, vomiting -Several mechs. proposed -Loss of estrogen receptor positive cells -CCNS -Agonist of GnRH receptor chronic stimulation leads to desensitization and downregulation of receptor function inhibits release of FSH and LH reduced testicular androgen synthesis -Minimal side effects impotence, hot flashes, tumor flare -Inhibits ribonucleotide reductase inhibits conversion of ribonucleotides to deoxyribonucleotides inhibits DNA synthesis -Does not need to enter tumor cells to cause cell death -Catalyzes deamination of extracellular asparagines to aspartate and ammonia certain tumors can’t synthesize their own asparagines -Myelosuppression -Hydroxyureainsesnsitive reductase -Increased reductase levels -Increaesd expression of asparagines synthetase in tumor -CCS, S-phase specific Mitomycin C (Mutamycin) Tamoxifen (Nolvadex) Gonatotropinreleasing hormone agonists Leuprolide (Lupron) Adrenocorticoids Miscellaneous Substituted urea Prednisone Enzymes L-asparaginase (Elspar) Hydroxyurea (Hydrea) Goserelin -Hypersensitivity reactions, urticaria, nausea, vomiting, skin rashes, sever anaphylactic reactions -No myelosuppression, alopecia, or GI toxicity Anti-Emetics 5-HT antagonists D2-receptor antagonists Bone Marrow Growth Factors Myeloid growth factors Signal Transduction Inhibitors Monoclonal antibodies Kinase inhibitors Ondansetron (Zofran) Prochlorperazine (Compazine) Metoclopramide (Reglan) G-CSF (filgrastim; Neupogen) GM-CSF (sargramostim; Leukine) Trastuzumab (Herceptin) Cetuximab (Erbitux) Bevacizumab (Avastin) Gefitinib (Iressa) Imatinib (Gleevec) Erlotinib (Tarceva) -Trastuzumab blocks the growth promoting activity of HER2 that is overexpressed in some cancers (breast, ovarian, etc.) -Cetuximab inhibitor of mutated or overexpressed EGFR -Bevacizumab blocks VEGF stimulation of VEGF receptor tyrosine kinase blocks angiogenesis Gefitinib and Erlotinib Inhibitors of mutated or overexpressed EGFR -Imatinib Blocks activity of Bcr-Abl and Kit tyrosine kinases -Trastuzimab: Mild, some cardiac toxicity, hypersensitivity reactions Cetuximab: Sever infusion reactions Bevacizumab: Uncommon, but include GI perforation -Trastuzimab: Loss Her2 expression Cetuximab: Loss of EGFR expression Bevacizumab: Unknown -Gefitinib: Mild; severe interstitial lung disease -Imatinib: Mild; serious and severe problems include liver problems, fluid retention, bleeding problems -Gefitinib: Loss of EGFR expression -Imatinib: Mutation of Bcr-Abl