Drotrecogin alpha (activated) (Xigris®, marketed by Eli Lilly) is a recombinant form of human activated protein C that has anti-thrombotic, anti-inflammatory, and profibrinolytic properties. Drotrecogin alpha (activated) belongs to the class of serine proteases. It is used mainly in intensive care medicine as a treatment for severe sepsis. In pharmacology and toxicology, a route of administration is the path by which a drug, fluid, poison or other substance is brought into contact with the body 1. ... Eli Lilly and Company (NYSE: LLY) is a global pharmaceutical company and one of the worlds largest corporations. ... Recombinant proteins are proteins that are produced by different genetically modified organisms following insertion of the relevant DNA into their genome. ... Protein C is a major physiological anticoagulant. ... Thrombosis is the formation of a clot or thrombus inside a blood vessel, obstructing the flow of blood through the circulatory system. ... Anti-inflammatory refers to the property of a substance or treatment that reduces inflammation. ... Crystal structure of Trypsin, a typical serine protease. ... Intensive Care Medicine or critical care medicine is a branch of medicine concerned with the provision of life support or organ support systems in patients who are critically ill who usually also require intensive monitoring. ... Sepsis (in Greek Σήψις, putrefaction) is a serious medical condition, resulting from the immune response to a severe infection. ...

Pharmacology

Mechanism of action

The specific mechanisms by which drotrecogin exerts its effect on survival in patients with severe sepsis is not completely understood. In vitro data suggest that activated protein C exerts an antithrombotic effect by inhibiting factors Va and VIIIa, and that it has indirect profibrinolytic activity by inhibiting plasminogen activator inhibitor-1 (PAI-1). In vitro data also suggest that activated protein C may exert an anti-inflammatory effect by inhibiting tumor necrosis factor production, by blocking leukocyte adhesion to selectins, and by limiting the thrombin-induced inflammatory responses within the microvascular endothelium.^{[citation needed]} Plasminogen activator inhibitor-1 is the principal inhibitor of tissue plasminogen activator (tPA) and urokinase (uPA), the activators of plasminogen and hence fibrinolysis (the physiological breakdown of blood clots). ... In medicine, tumor necrosis factor alpha (TNFα, cachexin or cachectin) is an important cytokine involved in systemic inflammation and the acute phase response. ... White Blood Cells is also the name of a White Stripes album. ... Selectins are a family of cell-surface adhesion molecules of leukocytes and endothelial cells. ...

Pharmacokinetics

If the dosage guidelines are followed, the drug reaches peak plasma levels after 2 hours and is completely cleared from plasma 2 hours after termination of the infusion period. Endogenous plasma protease inhibitors deactivate drotrecogin. Therefore, no dose adjustment is needed in elderly patients, or in patients with renal or hepatic dysfunction. yes

Presentation

Xigris is the current brand name of activated drotrecogin alfa, manufactured by Eli Lilly. The drug is sold in vials containing either 5mg or 20mg, respectively. The FDA approved the drug in 2001 as was the case with the drug authorities in many other countries. This article is about brands in marketing. ... Eli Lilly and Company (NYSE: LLY) is a global pharmaceutical company and one of the worlds largest corporations. ...

Uses

Indications

Drotrecogin is indicated for the reduction of mortality in adult patients with severe sepsis (sepsis associated with acute organ dysfunction) who have a high risk of death (as determined by APACHE II scores of 25 or greater). Sepsis (in Greek Σήψις, putrefaction) is a serious medical condition, resulting from the immune response to a severe infection. ...

Because of the risk of severe bleeding, associated with the use of Xigris®, the following guidelines have been additionally proposed, but are not FDA requirements:

• Drotrecogin should only be ordered by a Critical Care Medicine Attending Physician with approval from a second Critical Care Medicine Attending Physician.
• Drotrecogin should only be administered in an Intensive Care Unit (ICU), or a patient awaiting transfer to an ICU.

Although drotrecogin has potent anticoagulant properties, it is not indicated as an anticoagulant/antithrombotic drug in patients without severe sepsis. An anticoagulant is a substance that prevents coagulation; that is, it stops blood from clotting. ...

If used properly, drotrecogin is able to reduce mortality caused by severe sepsis signifcantly. The Recombinant Human Activated Protein C Worldwide Evaluation in Severe Sepsis (PROWESS) study demonstrated that treatment with drotrecogin reduced 28-day mortality of patients with severe sepsis by 6.1%, and that it was particular effective in those with a high risk for death (Acute Physiology and Chronic Health Evaluation II [APACHE II] score of >24) where mortality reduction has reached 13.0%. However, the drug was not effective in patients who had a low risk for death. Under the above mentioned assumptions as prerequisites for the use of Xigris®, drotrecogin is also a cost-effective drug.

Eli Lilly has recently issued 2 important additional warnings:^{[citation needed]}

• Patients with single organ dysfunction due to sepsis (e.g., lung) and recent surgery (within 30 days before drotrecogin use) have had a higher mortalitity rate in the PROWESS study. Treatment of these patient subgroup cannot be recommended.
• A recent study in pediatric patients with severe sepsis had to be discontinued (lack of positive results and severe side-effects).

Monitoring

• If evidence of bleeding (e.g., epistaxis, hematemesis, dizziness or faintness, hematuria, abdominal swelling or pain, skin bruises, back pain) is found the following parameters should be obtained: hemoglobin, hematocrit, coagulation panel, urinalysis, complete blood counts periodically; INR, as drotrecogin has minimal effect on PT, and the PT/INR ratio may be used to follow the development of coagulopathy in these patients.
• Drotrecogin may variably prolong the APTT. Therefore, APTT cannot be reliably used to assess the status of the coagulopathy during drotrecogin therapy.
• Monitoring of protein C or activated protein C levels during therapy of sepsis is unwarranted as "therapeutic" levels of drotrecogin, or of endogenous activated protein C, are unknown.

Dosage regime

Drotrecogin is to be given in multiple infusions covering a total period of 96 hours. The maximum duration of one infusion is 12 hours. The dosage is calculated using the formula:^[1]

mg of drotrecogin = (patient weight, kg) X 24µg/kg/hour X (hours of infusion) / 1000

Risks and contraindications

Contraindications

The following patients should not receive drotrecogin:

• Active internal bleeding
• Recent (within 3 months) hemorrhagic stroke
• Recent (within 2 months) intracranial/intraspinal surgery/severe head trauma
• Trauma patients with an increased risk of life threatening bleeding
• Presence of an epidural catheter
• Known or suspected intracranial neoplasm or mass lesion
• Known hypersensitivity to drotrecogin or any component
• Acute pancreatitis without a proven source of infection
• Pregnancy (treatment should be considered only, if the possible benefit for the mother weighs out the risk for the embryo or fetus)
• Breat feeding: It is not known whether drotrecogin is excreted in the milk of nursing mothers. Either breast-feeding or Xigris® should be discontinued taking into account the importance of drotrecogin to the mother.
• Patients under 18 yrs. of age (see additional warning issued by Lilly below)
• Patient is not expected to survive >28 days because of an uncontrollable medical condition
• Patient is moribund with perceived imminent death within 24 hours
• APACHE scores <25, because overall mortality in treated patients may be higher than in untreated control groups

Precautions

The following patients are at an increased risk for bleeding complications due to drotrecogin-alpha therapy, and a careful risk/benefit assessment should be made prior to initiating therapy.

• Therapeutic Heparin (>15 units/kg/h)
• Platelet count <30,000/mm3
• Recent (within 6 weeks) gastrointestinal bleeding
• Recent administration (within 3 days) of thrombolytic therapy
• Recent administration (within 7 days) of oral anticoagulants or GP IIb/IIIa inhibitors
• Recent administration (within 7 days) of >650mg/day of aspirin or other platelet inhibitors
• Recent (within 3 months) ischemic stroke
• Known or suspected intracranial AV malformation or aneurysm
• Known bleeding diathesis (e.g., hemophilia) except for acute coagulopathy related to sepsis
• Chronic severe hepatic disease
• HIV infection in association with a last known CD4 count of <50/mm3
• Any other condition in which bleeding constitutes a significant hazard or would be particularly difficult to manage because of its location
• Because drotrecogin-alpha is a therapeutic protein, there exists a potential for immunogenicity. Antibodies against drotrecogin have been observed. There is insufficient data at this time to quantify the risk, but extreme caution should be exercised if a patient has previously received drotrecogin-alpha.

Side-effects

Although patients at high risk of bleeding were excluded from the phase III clinical study (PROWESS), 25% of patients treated with drotrecogin and 18% of those receiving placebo experienced at least one bleeding event (principally ecchymoses or GI bleeding) during the 28-day study period. During treatment serious bleeding events (e.g., intracranial hemorrhage, any life-threatening bleeding event, any bleeding event requiring administration of at least 3 units of packed red blood cells daily for 2 consecutive days) occurred in 2.4% of patients treated with drotrecogin and in 1% of those receiving placebo. No significant differences between geriatric patients and younger patients regarding bleeding events in the drotrecogin group have been found.

No other side-effects have been observed so far.

In the meantime a second study encompassing approximately 2,000 adult patients has been completed and the results showed a comparable side-effect profile.

Interactions

Drug interactions with drotrecogin have not been systematically studied in patients with severe sepsis. Caution should be exercised when using other drugs that affect hemostasis concomitantly with drotrecogin (e.g. aspirin, warfarin, clopidogrel). However, the use of low dose prophylactic Heparin did not affect safety when given concurrently with drotrecogin. Aspirin or acetylsalicylic acid (acetosal) is a drug in the family of salicylates, often used as an analgesic (against minor pains and aches), antipyretic (against fever), and anti-inflammatory. ... Warfarin (also known under the brand names of Coumadin®, Jantoven®, Marevan®, and Waran®) is an anticoagulant medication that is administered orally or, very rarely, by injection. ... Clopidogrel (IPA: ) is a potent oral antiplatelet agent often used in the treatment of coronary artery disease, peripheral vascular disease, and cerebrovascular disease. ...

Marketing controversy

In 2001, Eli Lilly's chairman, president and CEO, Sidney Taurel, told shareholders: "No medicine better symbolizes our mission than Xigris," calling it "one of our industry's genuine breakthroughs."^[2]

Xigris was designed to fight sepsis, a condition that kills more than 200,000 Americans annually. It is the only approved drug for sepsis, and it costs $8,000 to treat a single patient. Lilly hoped it would be a blockbuster, with sales of at least a billion dollars a year. But after five years on the market, sales are only $200 million.

Eli Lilly used the Belsito & Company PR firm in a deceptive marketing campaign to promote Xigris, its drug for treatment of sepsis. A report in the New England Journal of Medicine (NEJM) accuses the company of initiating false reports of a shortage of the drug to boost sales.^[3] Belsito and Company spread the word that the drug was being "rationed" and physicians were being 'systematically forced' to decide who would live and who would die. As part of this effort, Lilly provided a group of physicians and bioethicists with a $1.8 million grant to form the Values, Ethics, and Rationing in Critical Care (VERICC) Task Force, purportedly to address ethical issues raised by rationing in the intensive care unit. Finally, the Surviving Sepsis Campaign was established, in theory to raise awareness of severe sepsis and generate momentum toward the development of treatment guidelines. The New England Journal of Medicine (NEJM) is a peer-reviewed medical journal published by the Massachusetts Medical Society with the highest impact factor for a general medical journal. ...

This marketing campaign is especially troublesome because Xigris has been linked to increased risk of serious bleeding in patients who use it as well as other concerns. "Controversy surrounds both the drug study itself and the FDA approval," wrote NEJM editor-at-large Richard P. Wenzel, MD in 2002.^[4]. The FDA approved the drug despite the advisory committee's split vote (10 to 10) due to concerns about the validity of the claimed efficacy and safety findings on the basis of a single trial.

Eli Lilly spokeswoman Judy Kay Moore insists that the company did not mastermind the ethics task force or steer the guideline-writing process. It was only a coincidence, Moore says, that the ethics task force and the Surviving Sepsis Campaign used the same P.R. firm, Belsito and Company.^[5]

Footnotes

1. ^ Xigris dosing tables. Retrieved on 2006-10-24.
2. ^ Eli Lilly Annual Report, 2001
3. ^ [1] Peter Q. Eichacker, Charles Natanson, Robert L. Danner, "Surviving Sepsis — Practice Guidelines, Marketing Campaigns, and Eli Lilly". NEJM Volume 355:1640-1642. (10 2006)
4. ^ [2] Laurie Barclay, MD. "Controversy Brews Over Xigris' Role in Treating Sepsis". Medscape Medical News. Oct 1, 2002
5. ^ National Public Radio October 18, 2006

2006 (MMVI) was a common year starting on Sunday of the Gregorian calendar. ... October 24 is the 297th day of the year (298th in leap years) in the Gregorian Calendar, with 68 days remaining. ...

External links

• Official site
• Information (PDF) on the drug from the Food and Drug Administration (FDA).

The Food and Drug Administration (FDA) is an agency of the United States Department of Health and Human Services and is responsible for regulating food (humans and animal), dietary supplements, drugs (human and animal), cosmetics, medical devices (human and animal) and radiation emitting devices (including non-medical devices), biologics, and...