COLLEGEVILLE, Pa., May 31 /PRNewswire-FirstCall/ -- Wyeth Pharmaceuticals, a division of Wyeth , today announced results of two new analyses of the pivotal study of the mTOR (mammalian target of rapamycin) inhibitor TORISEL(R) (temsirolimus), the only renal cancer therapy proven to extend median overall survival compared with interferon-alpha in patients with advanced renal cell carcinoma (RCC). These analyses, which are being presented at the 44th Annual Meeting of the American Society of Clinical Oncology (ASCO) in Chicago, reaffirm the efficacy and safety of TORISEL for the treatment of advanced RCC. TORISEL is the only approved cancer therapy that specifically inhibits the mTOR kinase, an important regulator of cell proliferation, cell growth and cell survival.
RCC will account for approximately 85 percent of renal cancers. There are an estimated 54,390 new cases of kidney and renal pelvis cancer diagnosed in the United States each year, and about 40 percent of patients have advanced disease at the time of diagnosis.
TORISEL was studied in a three-arm, phase 3 clinical trial of 626 patients with advanced RCC with three or more of six preselected prognostic risk factors who had received no prior systemic therapy. Results of this study demonstrated that TORISEL significantly increased median overall survival by 49 percent compared with interferon-alpha (10.9 months [95% CI: 8.6, 12.7] vs. 7.3 months [6.1, 8.8], P=0.0078) (Hazard Ratio [95% CI] = 0.73 [0.58, 0.92]).
"In summary, these analyses provide clinicians with additional information about the efficacy and safety of TORISEL for the treatment of advanced RCC patients. Wyeth is committed to the continued exploration of mTOR inhibition with TORISEL for the treatment of a variety of cancers," says Joseph S. Camardo, M.D., Senior Vice President, Global Medical Affairs, Wyeth Pharmaceuticals.
Abstract 5050: Exploratory Analysis of the Influence of Nephrectomy Status on Temsirolimus Efficacy in Patients With Advanced Renal Cell Carcinoma and Poor-Risk Features
This retrospective subgroup analysis evaluated whether the nephrectomy status (whether or not patients had undergone surgery for removal of the affected kidney) of patients with advanced RCC enrolled in the pivotal phase 3 study had an effect on the observed overall survival benefit of TORISEL compared with interferon-alpha. Investigators determined that both overall survival and progression-free survival were longer for patients treated with TORISEL compared with those treated with interferon-alpha, regardless of whether they had undergone nephrectomy. In addition, among patients who had not undergone nephrectomy, more patients treated with TORISEL showed reductions in the size of their primary kidney tumor than those treated with interferon-alpha (58% vs. 31%).
Abstract 5116: Characterization of Hyperglycemia, Hypercholesterolemia and Hyperlipidemia in Patients With Advanced Renal Cell Carcinoma Treated With Temsirolimus or Interferon-Alpha
Another analysis presented at the ASCO meeting examined specific side effects seen in the pivotal phase 3 study of TORISEL for advanced RCC, including high levels of blood glucose (hyperglycemia), cholesterol (hypercholesterolemia), and lipids (hyperlipidemia). More patients treated with TORISEL, either with or without diabetes, developed hyperglycemia of grade 2 or higher (P=0.002 for diabetic patients, P=0.001 for non-diabetic patients), compared with those treated with interferon-alpha. TORISEL also was associated with the development of hypercholesterolemia of grade 2 or higher, compared with interferon-alpha (P=0.001), but there was not a significant increase in hyperlipidemia versus interferon-alpha (P=0.675). However, the development of hyperglycemia or hypercholesterolemia did not have affect on overall survival or progression-free survival in this study.
The clinical data for TORISEL presented at the meeting represent only a portion of the totality of the safety and efficacy data from the ongoing clinical development of TORISEL.
TORISEL is an mTOR inhibitor. Inhibition of mTOR in treated cancer cells blocked the translation of genes that regulate the cell cycle. In in vitro studies using renal cancer cell lines, TORISEL inhibited the activity of mTOR and resulted in reduced levels of certain cell growth factors involved in the development of new blood vessels, such as vascular endothelial growth factor.
TORISEL is approved for the treatment of advanced RCC in the United States, European Union and other markets, based on results of a phase 3 clinical study that demonstrated that TORISEL improves overall survival for patients with advanced RCC compared with interferon-alpha.
Important Safety Information
Hypersensitivity reactions manifested by symptoms, including, but not limited to anaphylaxis, dyspnea, flushing and chest pain have been observed with TORISEL.
Serum glucose, serum cholesterol and triglycerides should be tested before and during treatment with TORISEL.
The use of TORISEL is likely to result in hyperglycemia and hyperlipemia. This may result in the need for an increase in the dose of, or initiation of, insulin and/or oral hypoglycemic agent therapy and/or lipid-lowering agents, respectively.
The use of TORISEL may result in immunosuppression. Patients should be carefully observed for the occurrence of infections, including opportunistic infections.
Cases of interstitial lung disease, some resulting in death, have occurred. Some patients were asymptomatic and others presented with symptoms. Some patients required discontinuation of TORISEL and/or treatment with corticosteroids and/or antibiotics.
Cases of fatal bowel perforation occurred with TORISEL. These patients presented with fever, abdominal pain, metabolic acidosis, bloody stools, diarrhea and/or acute abdomen.
Cases of rapidly progressive and sometimes fatal acute renal failure not clearly related to disease progression occurred in patients who received TORISEL.
Due to abnormal wound healing, use TORISEL with caution in the perioperative period.
Patients with central nervous system tumors (primary CNS tumor or metastases) and/or receiving anticoagulation therapy may be at an increased risk of developing intracerebral bleeding (including fatal outcomes) while receiving TORISEL.
Live vaccinations and close contact with those who received live vaccines should be avoided.
Patients and their partners should be advised to avoid pregnancy throughout treatment and for 3 months after TORISEL therapy has stopped.
The most common (incidence greater than or equal to 30%) adverse reactions observed with TORISEL are: rash (47%), asthenia (51%), mucositis (41%), nausea (37%), edema (35%), and anorexia (32%). The most common laboratory abnormalities (incidence greater than or equal to 30%) are anemia (94%), hyperglycemia (89%), hyperlipemia (87%), hypertriglyceridemia (83%), elevated alkaline phosphatase (68%), elevated serum creatinine (57%), lymphopenia (53%), hypophosphatemia (49%), thrombocytopenia (40%), elevated AST (38%), and leukopenia (32%).
Most common Grades 3/4 adverse events included asthenia (11%), dyspnea (9%), hemoglobin decreased (20%), lymphocytes decreased (16%), glucose increased (16%), phosphorus decreased (18%) and triglycerides increased (44%).
Strong inducers of CYP3A4/5 (e.g., dexamethasone, rifampin) and strong inhibitors of CYP3A4 (e.g., ketoconazole, atazanavir) may decrease and increase concentrations of the major metabolite of TORISEL, respectively. If alternatives cannot be used, dose modifications of TORISEL are recommended.
St. John's Wort may decrease TORISEL plasma concentrations, and grapefruit juice may increase plasma concentrations of the major metabolite of TORISEL, and therefore both should be avoided.
The combination of TORISEL and sunitinib resulted in dose-limiting toxicity (Grade 3/4 erythematous maculopapular rash, and gout/cellulitis requiring hospitalization).
Please see TORISEL full Prescribing Information at http://www.TORISEL.com.
Wyeth Pharmaceuticals, a division of Wyeth, has leading products in the areas of women's health care, infectious disease, gastrointestinal health, central nervous system, inflammation, transplantation, hemophilia, oncology, vaccines and nutritional products.
Wyeth is one of the world's largest research-driven pharmaceutical and health care products companies. It is a leader in the discovery, development, manufacturing and marketing of pharmaceuticals, vaccines, biotechnology products, nutritionals and non-prescription medicines that improve the quality of life for people worldwide. The Company's major divisions include Wyeth Pharmaceuticals, Wyeth Consumer Healthcare and Fort Dodge Animal Health.
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