It has previously been shown that high- dose rate External Beam Radiation (EBR) can cause a reactive oxygen species (ROS) mediated increase of CD20 in B cells and that the effect can last for up to 2- 3 days.15-17 We have shown both a stronger and more prolonged increase in rituximab binding by radio-immunotherapy with 177Lu- lilotomab as compared to EBR. It could be speculated that the prolonged and stronger effect could be re-lated to increased formation of ROS induced by the continuous, low- dose rate beta- irradiation from 177Lu- lilotomab in contrast to the short, high- dose rate gamma- irradiation from the EBR treatment. Consequently, anti- CD37 radioimmunotherapy with 177Lu- lilotomab can be used to both deliver short- range beta- radiation selectively and continuously to tumour cells, minimising irradiation of healthy tissues and increase CD20 binding in those cells that atre not killed by the radiation dose delivered and make these cells more susceptible for subsequent rituximab treatment
Dette er fra NANOS hjemmeside.
Altså en lengre aktivering av CD20, men ikke evigvarende