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Cancer cells co-cultured in vitro reveal unexpected differential growth ratesthat classical exponential growth models cannot account for. Twonon-interacting cell lines were grown in the same culture, and counts of eachspecies were recorded at periodic times. The relative growth of populationratios was found to depend on the initial proportion, in contradiction with thetraditional exponential growth model. The proposed explanation is thevariability of growth rates for clones inside the same cell line. This leads toa log-quadratic growth model that provides both a theoretical explanation tothe phenomenon that was observed, and a better fit to our growth data.

Simultaneous growth of two cancer cell lines evidences variability in growth rates