Healthcare Industry News: gastrointestinal stromal tumor
News Release - September 6, 2007
Aranesp(R) Study Showing No Negative Impact on Survival in SCLC Presented at World Conference on Lung CancerAmgen Oncology Presents New Lung Cancer Data for AMG 706 in Combination with Chemotherapy and Vectibix(TM)
SEOUL, Korea--(HSMN NewsFeed)--Amgen (NASDAQ:AMGN ) presented the results from a randomized, double-blind, placebo-controlled Phase 3 study evaluating the efficacy and safety of Aranesp® (darbepoetin alfa) in previously untreated patients with extensive-stage small-cell lung cancer (SCLC) receiving chemotherapy ("the 145 study") on Monday, Sept. 3 at the 2007 World Conference on Lung Cancer in Seoul, Korea. The study demonstrated no statistically significant difference in risk of death (overall survival Aranesp compared to placebo Hazard Ratio (HR): 0.93, 95 percent CI: 0.78 to 1.11) or investigator assessed progression-free survival (HR: 1.02, 95 percent CI: 0.86, 1.21). (WCLC Poster #PD6-3-6)
As reported in April, the "145 study" demonstrated that Aranesp maintained hemoglobin (Hb) levels at a higher level than placebo and significantly reduced red blood cell (RBC) transfusions relative to placebo. The estimated difference in Hb change between the two groups was 0.84 g/dL (95 percent CI: 0.53 g/dL, 1.15 g/dL). A total of 52 Aranesp patients (17 percent) had at least one red blood cell transfusion during the study treatment compared to 116 patients (39 percent) in the placebo group (HR: 0.40, 95 percent CI: 0.29, 0.55).
Overall, 493 of 596 patients died during the treatment period or long-term follow up through a pre-specified cut off date. In the Aranesp group, 242 patients (81 percent) died and 251 patients (84 percent) died in the placebo group. Median survival time to death was 40 weeks for both groups.
"These study results show no statistically significant difference in overall survival or investigator assessed progression-free survival when Aranesp is used in patients with extensive-stage small-cell lung cancer receiving chemotherapy," said Robert Pirker, M.D., Medical University of Vienna, Vienna, Austria. "This study is particularly important as it was conducted in a homogeneous population, receiving platinum-containing chemotherapy and the treatment arm received higher than usual doses of erythropoiesis stimulating agents (ESAs). It's important to note that this tumor type was one of the first to be reported as expressing a putative EPO receptor although subsequent rigorous studies have invalidated methodologies employed and there is at this time no conclusive evidence to indicate that the EPO receptor is in any way involved in the malignant process."
The adverse event rate was similar between the two groups. A total of 138 Aranesp patients (46 percent) and 121 patients in the placebo group (41 percent) experienced a serious adverse event. Cardiovascular and thromboembolic events occurred at a moderately higher rate in the Aranesp group (22 percent) than in the placebo group (15 percent), primarily due to embolisms/thromboses (9 percent Aranesp versus 5 percent placebo).
About the Aranesp Study
Amgen initiated the SCLC study in 2002 after results from a previous Phase 3 study showed a trend towards improved survival in patients with lung cancer. The 145 study was designed to evaluate whether increasing or maintaining hemoglobin concentrations with Aranesp, when administered with platinum-containing chemotherapy in patients with previously untreated extensive-stage SCLC, increased survival.
In this study, patients with a baseline Hb greater than or equal to 9 g/dL and less than or equal to 13 g/dL were randomized 1:1 to receive Aranesp 300 mcg or placebo every week (QW) for the first four weeks, followed by once every three week (Q3W) dosing (commencing on week 5) for the remainder of the 24-week treatment period. Patients were treated to a target Hb of 13 g/dL, which is higher than indicated by the FDA-approved product label, with dose withholding at 14 g/dL.
Demographics and baseline disease characteristics were generally similar between the treatment groups. Most patients were men (63 percent Aranesp, 66 percent placebo), and all subjects were white. The mean (SD) age was 61 years and was similar between the groups, and similar percentages of patients in each group were greater than or equal to 65 years of age (36 percent Aranesp, 34 percent placebo). Most patients had an ECOG performance status of less than 2 (78 percent Aranesp, 79 percent placebo), and the median time since initial diagnosis was 15 days in both treatment groups. Mean (SD) Hb values at baseline were 12.03 g/dL (1.07 g/dL) in the Aranesp group and 11.86 g/dL (1.03) in the placebo group.
AMG 706 in Combination with Chemotherapy and/or Vectibix Results (WCLC Poster #PD3-3-7)
Additionally, Phase 1b data were presented on Wednesday, Sept. 5, on AMG 706 administered in combination with carboplatin/paclitaxel (C/P) and/or Vectibix(TM) (panitumumab) for the treatment of patients with advanced non-small cell lung cancer (NSCLC). Data suggest that treatment with 125 mg daily of AMG 706 is tolerable when combined with C/P and/or Vectibix, with little effect on the compound's pharmacokinetic activity, warranting further investigation. Forty-five patients were enrolled and received greater than or equal to 1dose of AMG 706. There were three dose limiting toxicities across arms of the trial. Treatment-related adverse events (grades 3 or higher) included fatigue (22 percent), hypertension (22 percent), pulmonary embolism (13 percent) and diarrhea (4 percent).
Aranesp was approved by the U.S. Food and Drug Administration (FDA) in September 2001 for the treatment of anemia associated with chronic renal failure (CRF) for patients on dialysis and patients not on dialysis. In July 2002, the FDA approved weekly dosing of Aranesp for the treatment of chemotherapy-induced anemia in patients with nonmyeloid malignancies and in March 2006, the FDA approved every-three-week dosing in these patients.
Important Aranesp Safety Information
Use the lowest dose of Aranesp® that will gradually increase the hemoglobin concentration to the lowest level sufficient to avoid the need for red blood cell transfusion.
Aranesp and other erythropoiesis-stimulating agents (ESAs) increased the risk for death and for serious cardiovascular events when administered to target a hemoglobin of greater than 12 g/dL
Cancer Patients: Use of ESAs
- Shortened the time to tumor progression in patients with advanced head and neck cancer receiving radiation therapy when administered to target a hemoglobin of greater than 12 g/dL,
- Shortened overall survival and increased deaths attributed to disease progression at 4 months in patients with metastatic breast cancer receiving chemotherapy when administered to target a hemoglobin of greater than 12 g/dL,
- Increased the risk of death when administered to target a hemoglobin of 12 g/dL in patients with active malignant disease receiving neither chemotherapy or radiation therapy. ESAs are not indicated for this population.
Aranesp is contraindicated in patients with uncontrolled hypertension.
About AMG 706
AMG 706 is an investigational, highly selective, oral agent that is being evaluated for its ability to inhibit angiogenesis by targeting vascular endothelial growth factor receptors 1, 2 and 3 (VEGFR1-3). It is also under investigation for its potential direct anti-tumor activity by targeting platelet-derived growth factor receptor (PDGFR), and stem cell receptor (c-kit) signaling, which may also confer direct anti-tumor activity. AMG 706 has been studied in Phase 2 studies for both gastrointestinal stromal tumors and thyroid cancer. Currently, there are trials enrolling patients in non-small cell lung and breast cancer as well as in other solid tumors.
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Aranesp prescribing information can be accessed by calling 800-772-6436 or by logging on to www.aranesp.com.
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