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Fusion protein boosts survival
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Fusion protein boosts survival

04.06.2013 - Active Biotech's immunotoxin naptumomab estafenatox has doubled overall survival in renal cell cancer patients.

A combination therapy of Active Biotech's fusion protein naptumomab estafenatox (ABR-217620), plus interferon-alpha, extended overall survival in a patient subgroup of the ANYARA Phase II/III study to 63.3 compared to 31.1 months in the interferon-alpha arm. The drug is a new class of fusion protein, which links a FAB fragment of an antibody that specifically binds to the 5T4 antigen on tumour cells with the superantigen staphylococcal enterotoxin, that induces a tumour-specific T-cell immune response.

Statistically significant benefit, however, was only achieved when patients with high levels of pre-formed antibodies against superantigens or the cytokine IL-6 were excluded. In this subgroup of 131 patients, progression-free survival improved from 5.8 months in the interferon-alpha arm to 8.5 months in the naptumomab estafenatox - interferon-alpha arm. Active Biotech is now seeking a partner for Phase III development of the targeted cancer therapy"

Renal Cell Carcinoma (RCC) affects approximately 180,000 people worldwide each year. Approximately 50 % of the patients are affected by metastases. If the disease has metastasized, average survival is around 2 years. The survival rate of patients diagnosed with renal cancer is only 5-15% after five years. The market for treatment of RCC is estimated at approximately US$2.7bn per year (EvaluatePharma March 2012). Approved first-line treatments are Sutent, Avastin in combination with IFN, Torisel and Votrient. Authorised second-line treatment are Nexavar and Everolimus.

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