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  • Title: Evaluation of the growth rate of MCF-7 breast cancer multicellular spheroids using three mathematical models.
    Author: Olea N, Villalobos M, Nuñez MI, Elvira J, Ruiz de Almodóvar JM, Pedraza V.
    Journal: Cell Prolif; 1994 Apr; 27(4):213-23. PubMed ID: 10465016.
    Abstract:
    Growth data on 60 multicellular spheroids of MCF-7 human breast cancer cells were fitted, on an individual basis, by the Gompertz, Bertalanffy and logistic equations. MCF-7 spheroids, initiated and grown in medium containing oestrogens, exhibited a growth rate that decreased continuously as spheroid size increased. Plots of spheroid volume v. time generated sigmoid curves that showed an early portion with an approximately exponential volume increase; a middle region or retardation phase characterized by a continuously decreasing growth rate; and, finally, a late segment or plateau phase approaching zero growth rate, that permitted an estimate of the maximum spheroid size (Vmax). Growth curves generated by MCF-7 spheroids under different experimental conditions (hormones, drugs and radiation exposures) can be compared after normalization. Linearized forms of the fitted Gompertz curves provided a convenient way to express differences in growth rate.
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