The invention concerns an in vitro method for selecting the therapy for a steroid resistant patient, wherein the method comprises isolating cells from a sample taken from said patient; cultivating said isolated cells in the presence of a steroid, an immunomodulatory oligonucleotide or a mixture thereof; determining an expression level of at least one marker gene in said isolated cells; and comparing said expression level of said at least one marker gene to a value obtained from the cultivation of cells from a healthy person in the presence of a steroid, an immunomodulatory oligonucleotide or a mixture thereof, or to a normalized value obtained from a healthy population. Examples of marker genes are CD163, Tsp1, IL1-R2, TLR2, TLR4, MKP-1 and TXK.