Multiple Pappenheimer bodies.
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Biomedical subjects
Publications and source records attributed to Richard L Soutar.
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Long-term bisphosphonate therapy has been shown to offer clinical benefit in the management of multiple myeloma. This study sought to explore the feasibility and potential advantages of monthly home-based intravenous infusions of pamidronate in patients with multiple myeloma. In a prospective crossover, multicentre trial, 37 patients were randomly allocated to receive 3 months of treatment with pamidronate given in the home followed by 3 months of treatment with pamidronate given in hospital or vice versa. Results from a patient preference questionnaire indicated most patients preferred treatment at home. Quality-of-life measurement was undertaken using the EORTC QLQ-C30 questionnaire. The results indicated a small, generally consistent, although not statistically significant, trend in favour of home care treatment. Extra nursing specialist time was required for home therapy. Home therapy with pamidronate in patients with multiple myeloma appeared feasible and safe and was preferred by patients in this study.
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Anti-resorptive bisphosphonates, such as pamidronate, are an effective treatment for osteolytic disease and hypercalcaemia in patients with multiple myeloma, but have also been shown to cause apoptosis of myeloma cell lines in vitro. In this study, we found that a single infusion of pamidronate, in 16 newly diagnosed patients with multiple myeloma, caused a marked increase in apoptosis of plasma cells in vivo in 10 patients and a minimal increase in four patients (P < 0.05). The nitrogen-containing bisphosphonates pamidronate and zoledronic acid also induced apoptosis of authentic, human bone marrow-derived plasma cells in vitro. Apoptosis of plasma cells in vitro was probably caused by inhibition of the mevalonate pathway and loss of prenylated small GTPases, as even low concentrations (>or= 1 micro mol/l) of zoledronic acid caused accumulation of unprenylated Rap1A in cultures of bone marrow mononuclear cells in vitro. GGTI-298, a specific inhibitor of geranylgeranyl transferase I, also induced apoptosis in human plasma cells in vitro, suggesting that geranylgeranylated proteins play a role in signalling pathways that prevent plasma cell death. Our results suggest that pamidronate may have direct and/or indirect anti-tumour effects in patients with multiple myeloma, which has important implications for the further development of the more potent nitrogen-containing bisphosphonates, such as zoledronic acid, in the treatment of myeloma.