Radionuclide therapy has proven successful in delaying the growth of disseminated tumor cells (DTCs) in early-stage breast cancer in a small animal model, suggesting its use as a potential adjuvant therapy for retarding the proliferation of DTCs. As reported in the January issue of the Journal of Nuclear Medicine , the alpha-particle-emitting radiopharmaceutical 223RaCl2 not only impacts cells directly hit by radiation but also has significant effects on cells outside of the radiation field (i.e., bystander cells).
Breast cancer is the most common cancer diagnosed in women in the United States. While survival rates for women are high, approximately 20 percent of five-year survivors ultimately develop metastatic disease five to ten years after treatment. The formation of metastases involves circulating tumor cells that shed from the primary tumor and gain access to the circulatory system. These DTCs may sustain active proliferation and develop into macrometastases or may remain dormant for years before becoming active.
With a renewed interest in therapy with alpha-particle emitters and their potential for sterilizing DTCs, our study sought to determine whether bystander effects play a role in 223RaCl2 therapy and, if so, whether they can be leveraged to treat DTCs before disease progression." Roger W. Howell, PhD, and co-authors at Rutgers New Jersey Medical School, University of Florida and University of Gothenburg
In the study, female mice were administered 0, 50 or 600 kBq/kg of 223RaCl2 to create bystander conditions prior to tumor cell inoculation. After 24 hours, mice were inoculated with either estrogen receptor-positive human breast cancer cells or triple-negative (estrogen receptor-negative, progesterone receptor-negative, and human epidermal growth factor receptor 2-negative) human breast cancer cells into the tibial marrow compartment. Bioluminescence intensity of the inoculated tumor cell populations was measured on day one and weekly thereafter. Related Stories
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