THOUSAND OAKS, Calif., Dec. 13, 2011 /PRNewswire/ -- Amgen (NASDAQ:AMGN) today announced that data from several key Nplate® (romiplostim) studies were presented at the 53rd Annual Meeting and Exposition of the American Society of Hematology (ASH), Dec. 10-13, 2011, in San Diego. Of note, final results from the international, Phase 3, open-label, single-arm '209 study evaluating the safety and efficacy of Nplate in adults with primary immune thrombocytopenia (ITP) demonstrated that Nplate induced a rapid platelet response in adult ITP patients with low platelet counts or bleeding symptoms and maintained a consistent safety profile (Abstract No. 3279).
In the study, incidence and type of adverse events (AEs) in patients treated with Nplate were consistent with those reported in previous studies. The most common side effects included headache, arthralgia and fatigue.
Approximately 90 percent of patients achieved each of the platelet response definitions, regardless of splenectomy status. Median time to response was one to two weeks. Over the course of the study, a doubling of the platelet count to greater than or equal to 50,000 platelets per microliter was achieved by 91 percent of patients who received Nplate. A platelet count increase of greater than or equal to 20,000 platelets per microliter from baseline was achieved by 93 percent of patients who received Nplate.
"We are very pleased to present the final results from the largest prospective study of Nplate in adult patients with primary ITP, which highlight Nplate's ability to successfully treat these patients," said Sean E. Harper, M.D., senior vice president of Global Development and chief medical officer at Amgen. "Additional data presented at the meeting in other disease states help further elucidate the safety and efficacy profile of Nplate. Collectively, these data help build upon our understanding of Nplate's treatment potential for patients with thrombocytopenia."
'209 Study Design
This was an open-label, single-arm study of Nplate for the treatment of adults with primary ITP. Nplate was administered once weekly, with dose adjustments to maintain platelet counts of greater than or equal to 50,000 platelets per microliter. The primary study objective was incidence of AEs and antibody formation. Secondary study objectives were to evaluate platelet responses defined as either (1) doubling of baseline count and a platelet count greater than or equal to 50,000 platelets per microliter or (2) a platelet count increase of greater than or equal to 20,000 platelets per microliter from baseline. Four hundred and seven patients were enrolled; median on-study treatment duration was 44 weeks. Fifty-one percent of patients had previously undergone splenectomy.
ADDITIONAL ABSTRACTS OF INTEREST INCLUDE:
Abstracts are available on the ASH website at http://www.hematology.org and updated data were presented at the meeting. All presentations will take place at the San Diego Convention Center unless noted otherwise.
Nplate ITP Data
- Use of Rituximab in a Study Comparing the Thrombopoietin Mimetic Romiplostim with Standard of Care (SOC) in Patients with Immune Thrombocytopenia (ITP) (Abstract No. 3282)
- Sustained Hemostatic Platelet Counts in Adults With Immune Thrombocytopenia (ITP) Following Cessation of Treatment with the TPO Receptor Agonist Romiplostim: Report of 9 Cases (Abstract No. 3281)
- Clinical and Economic Outcomes Associated with Emergency Department Visits in Patients with Immune Thrombocytopenia (Abstract No. 4209)
- Hospitalizations in Pediatric Patients with Immune Thrombocytopenia (Abstract No. 170)
- Comparative Net Cost Impact of the Utilization of Romiplostim and Intravenous Immunoglobulin for the Treatment of Patients with Immune Thrombocytopenia in Quebec (Abstract No. 4211)
Nplate MDS Data
- Treatment with the Thrombopoietin (TPO)-Receptor Agonist Romiplostim in Thrombocytopenic Patients (Pts) with Low or Intermediate-1 (Int-1) Risk Myelodysplastic Syndrome (MDS): Results of a Randomized, Double-Blind, Placebo (PBO)-Controlled Study (Abstract No. 117)
- Update of an Open-Label Extension Study Evaluating the Long-Term Safety and Efficacy of Romiplostim in Thrombocytopenic Patients with Myelodysplastic Syndromes (MDS) (Abstract No. 277)
Nplate CLL Data
- c-Mpl is not expressed or functional at detectable levels on Primary Chronic lymphocytic leukemia (CLL) tumor samples (Abstract No. 2849)
About Adult ITP
In patients with ITP, platelets – blood elements needed to prevent bleeding – are destroyed by the patient's own immune system. Recent data also suggest that low platelet counts in the blood may be caused by the inability of the body's natural processes to produce platelets. Low platelet counts leave adult ITP patients open to sudden serious bleeding events. The risk for serious bleeding events increases when platelet counts drop to less than 30,000 platelets per microliter; normal counts range from 150,000 to 400,000 platelets per microliter. ITP has historically been considered a disease of platelet destruction although recent data suggest that the body's natural platelet production processes in ITP are unable to compensate for low levels of platelets in the blood. Increasing the rate of platelet production may address low platelet levels associated with ITP.
Some other available treatments (e.g., corticosteroids, immunoglobulins) are often unsuitable for long-term use due to tolerability issues and poor predictability of response. Surgical therapy (removal of the spleen) can be an option for many adult patients with chronic ITP, but does not work in all cases, and can be contraindicated in certain cases. Currently, there are approximately 90,000 adult chronic ITP patients in Europe and the United States (U.S.). ITP affects about twice as many adult women as men.
Nplate is approved in the U.S., European Union (EU), Canada, Australia, Russia, Mexico, Switzerland, Lichtenstein, Japan, Argentina, Israel, South Korea, Hong Kong, and Chile. Nplate also has received orphan designation for chronic ITP in the U.S. (2003), the EU (2005), Switzerland (2005), Japan (2006), Mexico (2010), South Korea (2010).
Nplate is the first FDA-approved treatment specifically for adult chronic ITP. It is also being investigated for potential use in children ages 12 months to 18 years old with persistent severe thrombocytopenia, and chemotherapy-induced thrombocytopenia (CIT).
In the U.S., Nplate is indicated for the treatment of thrombocytopenia in patients with chronic ITP who have had an insufficient response to corticosteroids, immunoglobulins or splenectomy. Nplate is not indicated for the treatment of thrombocytopenia due to
myelodysplastic syndrome (MDS) or any cause of thrombocytopenia other than chronic ITP. Nplate should be used only in patients with ITP whose degree of thrombocytopenia and clinical condition increase the risk for bleeding. Nplate should not be used in an attempt to normalize platelet counts.
In the EU, Nplate is indicated for the treatment of splenectomized adult chronic ITP patients who are refractory to other treatments (e.g., corticosteroids, immunoglobulins). Nplate may be considered as a second-line treatment for adult non-splenectomized ITP patients for whom surgery is contraindicated.
Nplate was named as a recipient of the U.S. Prix Galien 2009 "Best Biotechnology Product" award and also received the 2009 Scrip Awards for "Best New Drug." Nplate has also been honored with numerous awards throughout the EU, including a 2010 Prix Galien in France in the category of "Drugs for Rare Diseases," and the 2011 Prix Galien in Germany in the category of "Specialist Care." In September 2010, Nplate was awarded the 2010 International Prix Galien Award, an award granted every two years which recognizes the "best of the best" selected from previous national Prix Galien award recipients.
For more information about Nplate, please visit www.Nplate.com.
Important U.S. Nplate Safety Information
The risks associated with Nplate include progression of MDS to acute myelogenous leukemia (AML) in patients with MDS, thrombotic/thromboembolic complications, bone marrow reticulin formation and risk for bone marrow fibrosis, worsened thrombocytopenia after cessation of Nplate, and lack or loss of response to Nplate. In the placebo-controlled studies, headache was the most commonly reported adverse drug reaction.
Important EU Nplate Safety Information
The most common side effects are headache, fatigue, arthralgia and myalgia.
The risks associated with Nplate include reoccurrence of thrombocytopenia, bleeding after cessation of treatment, increased bone marrow reticulin, thrombotic/thromboembolic complications, progression of existing MDS (in patients with MDS), loss of response to Nplate, and effects on red and white blood cells.
Important EU Nplate Safety Information
The most common side effects are headache, fatigue, arthralgia, myalgia, injection site bruising, injection site pain, oedema peripheral, dizziness, muscle spasms, nausea, contusion, diarrhea, bone marrow disorder, influenza-like illness, insomnia and pruritus.
Reoccurrence of thrombocytopenia and bleeding after cessation of treatment and increased bone marrow reticulin have been associated with Nplate treatment in the clinical trials. Thrombotic/thromboembolic complications, progression of existing hematopoietic malignancies or MDS, and effects on red and white blood cells are all potential risks associated with Nplate treatment. As with all therapeutic proteins, patients may develop antibodies to the therapeutic protein.
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