Summary
A monoclonal antibody (Tumak) against carcinoembryonic antigen (CEA) was injected into nude mice bearing a human colon carcinoma (Co-112). The tumor uptake was found to be dependent on the size of the tumors: relative uptake (percentage of the injected dose/gram tumor (% i. d./g) decreased for tumors with weights up to ∼1 g, although the absolute uptake (% i. d./tumor) still increased over the same weight range. In the constant region (≥1 g) mean relative tumor uptake was ∼4% i. d./g.
The same tumor size dependence was found for the relative Tumak uptake in the other mouse organs studied (e.g., blood, liver, spleen and muscle). Consequently tumor/organ ratios were found to be independent of tumor size.
Tumor uptake was also studied for various doses of Tumak (0.07–120 μg) in tumors of ∼1 g. Evidence was found for a threshold dose of 0.1 μg under which no serious tumor uptake appeared. From 1 to 120 μg no further dependence of Tumak distribution on applied dose was found: the relative uptake of all organs remained the same but the absolute uptake increased with dose.
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Duewell, S., Horst, W. & Westera, G. Uptake of a monoclonal antibody against CEA (Tumak 431/31) in a human colon tumor (Co-112) xenografted in the nude mouse. Cancer Immunol Immunother 23, 101–106 (1986). https://doi.org/10.1007/BF00199814
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DOI: https://doi.org/10.1007/BF00199814