The experimental model of synchronous multiple primary malignant tumors (MPMT) was created. B16/F10 melanoma (0.5 ml of suspension diluted 1:20 in saline) and sarcoma 45 (0.5 million tumor cells in 0.5 ml saline) were simultaneously subcutaneously inoculated to male BALB/c nude mice. In the model of synchronous MPMT, the tumors appeared faster by 2.4 times and had greater volumes: melanoma by 2.2 times and sarcoma by 3.2 times; melanoma metastasized into sarcoma in 71.4% cases; the survival of mice with MPMT was lower. The altered dynamics of malignant growth in the MPMT model is based on the mutual influence of tumors, which results in the exchange of "structural information".
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