Diffuse-type gastric cancer often develops a peritoneal carcinomatosis (PC) after dissemination of single tumor cells. Currently, there exists no effective treatment of PC. As shown in previous studies locoregional application of tumor specific monoclonal antibody d9MAb conjugated with α-emitter 213Bi against mutated d9-E-Cadherin achieved very promising therapeutic results in a nude mice model with PC. This study evaluated the therapeutic efficacy and toxicity of β-emitter 177Lu conjugated d9MAb in nude mice and compared it to the efficiency of 213Bi-d9MAb. The results demonstrated that 177Lu-d9MAb conjugates prolonged survival significantly compared with untreated mice, especially in the very early stage of PC. However, considering the strong decrease of leukocytes and the appearance of malignant lymphomas, toxicity was higher after 177Lu-d9MAk application compared to the application of 213Bi-d9MAb. Hence 213Bi-d9MAb conjugates should be preferred in the locoregional radioimmunotherapy of PC.
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Diffuse-type gastric cancer often develops a peritoneal carcinomatosis (PC) after dissemination of single tumor cells. Currently, there exists no effective treatment of PC. As shown in previous studies locoregional application of tumor specific monoclonal antibody d9MAb conjugated with α-emitter 213Bi against mutated d9-E-Cadherin achieved very promising therapeutic results in a nude mice model with PC. This study evaluated the therapeutic efficacy and toxicity of β-emitter 177Lu conjugated d9MA...
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