The present invention relates to a method comprising inferring activity of an NFkB cellular signaling pathway based at least on expression levels of six or more target genes of the NFkB cellular signaling pathway measured in a sample. The present invention further relates to an apparatus comprising a digital processor configured to perform such a method, a non-transitory storage medium storing instructions that are executable by a digital processing device to perform such a method, and a computer program comprising program code means for causing a digital processing device to perform such a method. The present invention further relates to kits for measuring expression levels.
