Bone Scan Response (BSR). Computer-assisted evaluation of bone scan lesion area (BSLA) was performed and response evaluated by an Independent Radiology Committee (IRC). An overall BSR rate (complete response + partial response) of 49% was observed, with another 29% of patients having stable disease, and 14% having a best response of progressive disease.Initial results from ongoing efforts focused on documenting the direct impact of cabozantinib on tumor lesions in the bone of prostate cancer patients were presented, and suggest that cabozantinib’s effects on bone scan may be linked to induction of tumor necrosis in bone metastases. In a patient with complete resolution of pelvic metastatic lesions on bone scan, diffusion-weighted magnetic resonance imaging (MRI) findings were consistent with tumor necrosis occurring within the bone metastases. Additional evidence for the tumor selective effect of cabozantinib on bone scans was also presented, based on an analysis of a patient with concurrent osteoarthritis. In this patient, near complete resolution of bone scan tracer uptake at sites of metastatic tumor lesions was observed, while bone scan tracer uptake was maintained at sites of osteoarthritis. To gain further insights into the effects of cabozantinib on bone lesions, there are other ongoing clinical trials using MRI, other imaging techniques, and bone-metastatic tumor biopsies.
Interim Data For Cabozantinib 40 Mg Dose Cohort In Metastatic Castration-Resistant Prostate Cancer Presented At ESMO 2012 Congress
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