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New targeted therapy for advanced prostate cancer shows anti-tumor activity in clinical trials
Date:11/7/2012

ntres recruited 50 patients to the phase I clinical trial. The patients had the most advanced form of prostate cancer, which had spread to the bone and other organs; they had failed hormone therapy and had received up to two previous chemotherapies. The researchers treated them with doses of PSMA ADC at levels ranging from 0.4 to 2.8 mg/kg, by intravenous infusion, over a period of three weeks per cycle, and for up to four treatment cycles.

The researchers detected anti-tumour activity among the patients who were treated at the higher doses. About half of the patients who received doses of 1.8 mg/kg or more showed either a 50% or more reduction in PSA levels, or a fall in CTC in the blood to less than five cells per 7.5 ml of blood, or both.

The drug was generally well tolerated by patients, although levels of white blood cells were significantly reduced (neutropenia) at the highest dose of 2.8 mg/kg and one patient died. The researchers say the cause of the death is unclear.

Prof Petrylak said: "These results show that PSMA ADC has anti-tumour activity in patients who have failed up to two prior chemotherapies and hormone therapy. We have initiated a phase II trial of up to 75 patients in which the recommended dose will be 2.5 mg/kg. This new trial will evaluate responses in PSA and CTC; it will evaluate control of metastases in bone, internal organs and lymph nodes; and it will look at the effect on pain. Safety also will be assessed.

"The fact that this new targeted therapy is active against the most advanced forms of prostate cancer is encouraging, as few or no therapeutic options are available at present."

Professor Stefan Sleijfer, the scientific chair of the EORTC-NCI-AACR Symposium, from Erasmus University Medical Centre (The Netherlands), commented: "The approach tested here represents a novel way to treat prostate cancer. The anti-tumour effects already seen at such an early phase of clinical testing, such as a
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Contact: Emma Mason
wordmason@mac.com
ECCO-the European CanCer Organisation
Source:Eurekalert

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