Cancer therapy shows promise for nuclear medicine treatment

Cancer therapy can be much more effective using a new way to customize nuclear medicine treatment, researchers say in the December 2014 issue of The Journal of Nuclear Medicine. The process could also be useful for other diseases that could benefit from targeted radiation.

Targeted therapy with radiopharmaceuticals—radioactive compounds used in for diagnosis or treatment—has great potential for the treatment of cancer, especially for that have migrated from primary tumors to lymph nodes and secondary organs such as bone marrow. These disseminated can be difficult to treat with a single targeting agent because there are dramatic differences in the number of targetable receptors on each cell.

In the study, were treated with different concentrations of a cocktail of four fluorochrome-conjugated monoclonal antibodies. The amount of each antibody bound to each cell was determined using flow cytometry. Formulas were developed to "arm" the antibodies with the desired radionuclide and activity, calculate the absorbed dose to each cell, and perform a simulation of the surviving fraction of cells after exposure to cocktails of different antibody combinations. Simulations were performed for three alpha-particle emitters.

"Our approach moves radiation treatment planning for cancer therapy from the tumor level to the molecular and cellular level, with nuclear medicine serving as the treatment engine," stated Roger Howell, Ph.D., lead researcher. "The concepts are not restricted to cancer therapy but can be applied more widely to other diseases that may benefit from a targeted approach with cocktails of radiopharmaceuticals. The approach can also be extended to cocktails consisting of radiopharmaceuticals and non-radioactive agents."

The effect of the radiopharmaceutical cocktails was compared to that of single antibodies. In certain activities, cocktails outperformed single antibodies by a factor of up to 244. These findings suggest that targeted alpha therapy can be improved with customized radiolabeled antibody cocktails. Depending on the antibody combination and specific activity of the radiolabeled antibodies, cocktails can provide a substantial advantage in tumor cell killing. The methodology used in this analysis provides a foundation for pretreatment prediction of tumor cell survival in the context of personalized .

"This method is preferable, as it accounts for behavior of the drugs in the patient's body," Howell continues. "The beauty of either approach for planning a treatment is that the patient is not subjected to any radiopharmaceutical injections during the planning phase, which uses only fluorescent-labeled drugs. The patient is not injected with radiopharmaceuticals until the treatment phase, whereupon only a cocktail specifically optimized for that individual is administered. This spares the patient from receiving ineffective cocktails that may damage normal tissues and prevent further ."


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More information: "The Advantage of Antibody Cocktails for Targeted Alpha Therapy Depends on Specific Activity" The Journal of Nuclear Medicine, 2014.
Journal information: Journal of Nuclear Medicine

Citation: Cancer therapy shows promise for nuclear medicine treatment (2014, December 9) retrieved 22 October 2019 from https://medicalxpress.com/news/2014-12-cancer-therapy-nuclear-medicine-treatment.html
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