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Tumor mass predicted for each clone (M1 and M2), their sum (M = M1 + M2)) and the overall tumor according to the Gompertz Law (GL). The time delay between the two populations is 500 days (a) and 2000 days (b). The other parameters values are: M∞ = 640 g, M (0) = 6.4 g, M21 (tδ) = M1 (tδ) 10-6 and M1 = 0.4 M∞.
