A method used to design a microchip (DNA microarray) for identifying the presence of prostate tumor, evaluating its degree of mali-gnity (typization, characterization) and supplying information allowing prediction of the clinical course of the illness (prognosis) is discussed below. The method is based on assessment of the levels of expression of a definite package of genes in the tumoral tissue in comparison with the corresponding benign tissue. The readings thus obtained, - alone, in different combinations with each other or in different combinations and integrated with standardized clinical data - give the results described above.