The paper presents the simulation results of gene expression sequences clustering within the framework of the objective clustering inductive technology. As experimental data the gene expression sequences of lung cancer patients, which were obtained by microchip experiments, were used. The estimation of the grouping data quality was performed with the use of the internal and external clustering quality criteria on the two equal power subsets, which included the same quantity of pairwise similar objects. The final decision about the objects grouping is done based on the minimum value of the external clustering quality criterion.