Spectrum Pharmaceuticals Announces Publication Demonstrating Enhanced Survival With ZEVALIN In Premier Medical Journal Blood

Spectrum Pharmaceuticals (NasdaqGS: SPPI), a biotechnology company with fully integrated commercial and drug development operations with a primary focus in hematology and oncology, announced today publication of positive long-term clinical data for ZEVALIN® (ibritumomab tiuxetan) Injection in patients with advanced, relapsed follicular non-Hodgkin’s lymphoma (fNHL). The data, published in Blood, the journal of the American Society of Hematology, showed that addition of ZEVALIN following fludarabine, cyclophosphamide, rituximab (FCR) conditioning and nonmyeloablative allogeneic stem cell transplantation (NST) resulted in a significantly improved 6-year overall survival (OS) estimate of 80% (95% CI, 41%-95%) in chemotherapy refractory patients, thereby overcoming a strong negative prognostic factor that typically precludes these patients from receiving other treatment options. As reported in the literature, following three episodes of relapsed disease, patients with chemorefractory disease have a median survival of 1.5 years. ¹ The clinical trial data were presented most recently at the 53rd American Society of Hematology Annual Meeting in December 2011.

“It is very encouraging to see the publication of long-term clinical data showing that ZEVALIN's usage in this allogeneic transplantation regimen can contribute to improved overall survival in the abysmal prognostic group of patients with disease progression after multiple chemotherapy regimens and in some cases, even with the standard preparative regimen used in autologous stem cell transplantation,” stated Rajesh C. Shrotriya, M.D., Chairman, President and Chief Executive Officer of Spectrum Pharmaceuticals, Inc. “These data are very important to understanding the benefit of ZEVALIN in patients who receive allogeneic stem cells from donors and build on previously published and presented findings for autologous stem cell approach in these refractory patients. These data help solidify a role of ZEVALIN in stem cell transplantation.”

Dr. Shrotriya continued, “Holding our product to the highest standard of scientific evidence, we are pleased to report progress in our randomized stem cell transplantation trial, ‘SPINOZA’ ( Study with Preparatory INduction Of ZEVALIN in Aggressive lymphoma), which has enrolled 39 patients to date. With recently expanded international participation, this trial is on target to enroll more than 150 patients who receive ASCT for relapsed Diffuse Large B-Cell Lymphoma, the most common form of aggressive lymphoma.”

In the clinical study reported this week in Blood, 26 fNHL patients undergoing NST (25 from peripheral blood and 1 from bone marrow) after FCR conditioning received ZEVALIN treatment regimen and were evaluated 1, 3, 6, and 12 months after NST; every 6 months up to 5 years; and yearly thereafter. With a median follow-up duration of 33 months (range, 17-94 months), the estimated OS and PFS rates at 3 years were 88% (95% CI, 68%-96%) and 85% (95% CI, 64%-94%), respectively. Results were similar to those in a separate group of patients (N=47) who received NST after FCR conditioning (salvage treatment) without ZEVALIN, in whom the 3-year OS and PFS estimates were 85% (95% CI, 71%-93%, P = 0.7) and 83% (95% CI, 69%-91%, P = 0.9), respectively. The addition of ZEVALIN was able to benefit highly refractory patients by providing outcomes similar to those who responded to the salvage regimen administered.

About Non-Hodgkin's Lymphoma

According to the National Cancer Institute ( www.cancer.gov), there are expected to be 70,130 new cases of non-Hodgkin's lymphoma diagnosed and approximately 18,940 deaths in the United States in 2012. Non-Hodgkin's lymphoma is defined as any of a large group of cancers of lymphocytes (white blood cells). Non-Hodgkin's lymphomas can occur at any age and are often marked by lymph nodes that are larger than normal, fever, and weight loss. There are many different types of non-Hodgkin's lymphoma. These types can be divided into aggressive (fast-growing) and indolent or low grade (slow-growing) types, and they can be formed from either B-cells or T-cells. Prognosis and treatment depend on the stage and type of disease.

About ZEVALIN® and the ZEVALIN Therapeutic Regimen

ZEVALIN (ibritumomab tiuxetan) Injection for intravenous use is indicated for the treatment of patients with relapsed or refractory, low-grade or follicular B-cell non-Hodgkin's lymphoma (NHL). ZEVALIN is also indicated for the treatment of patients with previously untreated follicular non-Hodgkin's lymphoma who achieve a partial or complete response to first-line chemotherapy.

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