Small Cell Lung Cancer Medication
- Author: Winston W Tan, MD; Chief Editor: Jules E Harris, MD more...
Medication Summary
The goals of pharmacotherapy are to induce remission, reduce morbidity, and prevent complications.
Antiemetic agents
Class Summary
Vomiting induced by antineoplastic agents is stimulated through the chemoreceptor trigger zone (CTZ), which then stimulates the vomiting center (VC) in the brain. Increased activity of central neurotransmitters, dopamine in CTZ or acetylcholine in VC, appears to be a major mediator in inducing vomiting. Following administration of antineoplastic agents, serotonin (5-HT) is released from enterochromaffin cells in the gastrointestinal (GI) tract. With serotonin (5-HT) release and subsequent binding to 5-HT3 receptors, vagal neurons are stimulated and transmit signals to the VC, resulting in nausea and vomiting.
Antineoplastic agents may cause nausea and vomiting so intolerable that some patients refuse further treatment. Some antineoplastic agents are more emetogenic than others. Prophylaxis with antiemetic agents before and following cancer treatment is often essential to ensure administration of the entire chemotherapy regimen.
Metoclopramide (Clopra, Reglan, Maxolon, Octamide PFS)
Metoclopramide is a dopamine antagonist that stimulates acetylcholine release in myenteric plexus by acting centrally on the chemoreceptor triggers in the floor of the fourth ventricle, which provides important antiemetic activity.
Dexamethasone (Decadron)
Dexamethasone is a synthetic adrenocortical steroid with multiple indications. This agent is widely used in combination with 5-HT receptor antagonists to prevent nausea and vomiting caused by highly emetogenic agents (eg, cisplatin).
Ondansetron (Zofran)
Ondansetron is a selective 5-HT3-receptor antagonist that is used to prevent chemotherapy-induced nausea and vomiting. It is unclear whether the effect of this agent is centrally and/or peripherally mediated.
Granisetron (Kytril)
Granisetron is a selective 5-HT3-receptor antagonist that is used to prevent chemotherapy-induced nausea and vomiting. Like ondansetron, it is unclear whether the effect of granisetron is centrally and/or peripherally mediated.
Dolasetron (Anzemet)
Dolasetron binds to 5-HT3 receptors located on vagal neurons in the GI tract, blocking signals to the vomiting center, thus preventing nausea and vomiting.
Palonosetron (Aloxi)
Palonosetron is a selective 5-HT3 receptor antagonist with long half-life (40 h) that blocks 5-HT3 receptors peripherally and centrally in the chemoreceptor trigger zone. This agent is indicated for the prevention and treatment of chemotherapy-induced nausea and vomiting.
Antineoplastic agents
Class Summary
Cancer chemotherapy is based on an understanding of tumor cell growth and how drugs affect this growth. After cells divide, they enter a period of growth (ie, cell-cycle phase G1), followed by DNA synthesis (ie, phase S). The next phase is a premitotic phase (ie, G2); then, finally, mitotic cell division (ie, phase M) occurs.
The cell division rate varies for different tumors. Most common cancers grow very slowly compared with the growth rate of normal tissues, and the rate may decrease further in large tumors. This difference allows normal cells to recover more quickly from chemotherapy than malignant ones, which is the rationale behind current cyclic dosage schedules. Dosage cycles are determined by cancer stage and tolerance of adverse effects.
Antineoplastic agents are used in the curative therapy of limited-stage small cell lung cancer (SCLC) or to prolong survival in extensive-stage disease. These agents interfere with cell reproduction. Some agents are cell-cycle specific, whereas others (eg, alkylating agents, anthracycline, cisplatin) are not. Cellular apoptosis (ie, programmed cell death) is also a potential mechanism of action of many antineoplastic agents.
A phase II study of amrubicin, a synthetic anthracycline drug, showed a response rate of 44% in patients treated with this drug in the second-line setting.[42] Further studies are needed to evaluate its true efficacy in the phase III setting.
Etoposide (Toposar, VePesid)
Etoposide inhibits topoisomerase II and causes DNA strand breakage, causing cell proliferation to arrest in the late S or early G2 portion of the cell cycle.
Cyclophosphamide (Cytoxan, Neosar)
Cyclophosphamide is chemically related to the nitrogen mustards. As an alkylating agent, the mechanism of action of its active metabolites may involve cross-linking of DNA, which may interfere with the growth of normal and neoplastic cells. Fatal cardiotoxicity has been reported with coadministration of pentostatin.
Doxorubicin (Adriamycin, Rubex)
Doxorubicin inhibits topoisomerase II and produces free radicals, which may cause destruction of DNA. The combination of these 2 events can in turn inhibit the growth of neoplastic cells.
Vincristine (Oncovin)
Vincristine inhibits tubulin polymerization during mitosis. This agent is G2-phase specific. Vincristine may interact with mitomycin-C and cause an acute pulmonary reaction.
Topotecan (Hycamtin)
Topotecan inhibits topoisomerase I and thereby inhibits DNA replication. This agent may interact with other antineoplastic drugs to cause prolonged neutropenia and thrombocytopenia in addition to increasing morbidity/mortality.
Paclitaxel (Taxol)
The mechanisms of action of paclitaxel are tubulin polymerization and microtubule stabilization. This agent may interact with cisplatin to further increase myelosuppression.
Carboplatin (Paraplatin)
Carboplatin is an analogue of cisplatin (ie, platinum-salt alkylating agent) with a similar efficacy but lower toxicity profile. The mechanism of action for cisplatin and carboplatin is the production of cross-links within and between strands of DNA. Carboplatin may interact with aminoglycosides and other nephrotoxic drugs to increase nephrotoxicity and ototoxicity.
Cisplatin (Platinol)
Cisplatin is an alkylating agent that causes intrastrand and interstrand cross-linking of DNA, leading to strand breakage. This agent has a broad range of antitumor activity and is used in testicular, ovarian, and transitional cell carcinomas. Cisplatin forms the backbone of currently available approved combination chemotherapy regimens for non–small-cell lung cancers (NSCLCs) and SCLCs. Administer adequate hydration before and for 24 hours after cisplatin dosing to reduce the risk of nephrotoxicity.
Docetaxel (Taxotere)
Docetaxel is a semisynthetic taxane, a class of drugs that inhibits cancer cell growth by promoting assembly and blocking disassembly of microtubules, thereby preventing cancer cell division, leading to cell death.
Irinotecan
Irinotecan is a derivative of camptothecins and it inhibits topoisomerase I, inhibiting DNA replication, which causes cell death.
Ifosfamide (Ifex)
Ifosfamide is a nitrogen mustard that inhibits DNA and protein synthesis and, thus, cell-proliferation by causing DNA cross-linking and denaturation of double helix.
Gemcitabine (Gemzar)
Gemcitabine is a pyrimidine analog. After intracellular metabolism to active nucleotide, it inhibits ribonucleotide reductase and competes with deoxycytidine triphosphate for incorporation into DNA. It is cell-cycle specific for S phase.
Vinorelbine (Navelbine)
Vinorelbine is a vinca alkaloid that inhibits tubulin polymerization during G2 phase of cell division, thereby inhibiting mitosis.
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| Newly Diagnosed Cases of Diagnosed Lung Cancer | Lung Cancer Deaths | |
| 2008 Estimates | ||
| Total (% of all cancers) | 215,020 (15%) | 161,840 (29%) |
| Men | 114, 690 | 90,810 |
| Women | 100,330 | 71,030 |
| 2009 Estimates | ||
| Total (% of all cancers) | 219,440 (15%) | 159,390 (28%) |
| Men | 116,090 | 88,900 |
| Women | 103,350 | 70,490 |
| 2010 Estimates | ||
| Total (% of all cancers) | 222,520 (15%) | 157,300 (28%) |
| Men | 116,750 | 86,220 |
| Women | 105,770 | 71,080 |
| Sources: American Cancer Society. Cancer facts & figures 2008,[15] 2009,[19] 2010.[20] | ||
| Organ System | Syndrome | Mechanism | Frequency |
| Endocrine | SIADH | Antidiuretic hormone | 5-10% |
| Ectopic secretion of ACTH | Adrenocorticotropic hormone | 5% | |
| Atrial natriuretic factor | |||
| Neurologic | Eaton-Lambert reverse myasthenic syndrome | 5-6% | |
| Subacute cerebellar degeneration | |||
| Subacute sensory neuropathy | |||
| Limbic encephalopathy | Anti-Hu, Anti-Yo antibodies | ||
| ACTH = adrenocorticotropic hormone; SIADH = syndrome of inappropriate antidiuretic hormone. | |||
| Regimen | Dose |
| “CAV” Regimen | |
| Cyclophosphamide | 1000 mg/m2 IV day 1 |
| Doxorubicin (Adriamycin) | 50 mg/m2 IV day 1 |
| Vincristine | 2 mg IV |
| “PE” Regimen | |
| Cisplatin | 25 mg/m2 IV days 1-3 |
| Etoposide | 100 mg/m2 IV days 1-3 |
| “CAVE” Regimen | |
| Cyclophosphamide | 1000 mg/m2 IV day 1 |
| Doxorubicin (Adriamycin) | 50 mg/m2 IV day 1 |
| Vincristine | 1.4 mg/m2 IV day 1 (maximum 2 mg) |
| Etoposide | 100 mg/m2 IV day 1 |
| “PEC” Regimen | |
| Paclitaxel | 200 mg/m2 IV day 1 |
| Etoposide | 50 mg/d PO alternating with 100 mg/d PO from days 1-10 |
| Carboplatin | AUC 6 IV day 1 |
| Single-Agent Regimens | |
| Topotecan | 1.5 mg/m2 IV day 1-5 |
| Etoposide | 50 mg PO bid days 1-14 |
| AUC = area under the concentration curve; bid = twice daily; IV = administered intravenously; PO = administered orally. | |

