[Assessment of the parameters of the growth kinetics of an experimental tumor].

A model of the Markov stochastic reproduction and death process is studied as applied to the analysis of time intervals necessary for the experimental tumours to achieve the fixed size. The analysis results have shown nonstationarity of the tumour growth processes during early stages of the tumour development. The presence of such a nonstationarity makes the experimental data interpretation difficult when applying the traditional approach to the tumour cell population kinetics.