This invention provides a method for determining whether a human subject is afflicted with a predetermined disorder comprising the steps of (a) synchronizing a population of suitable cells derived from the subject; and (b) in the resulting synchronized cell population, measuring the expression level of a gene known to be differentially expressed between corresponding synchronized cells derived from patients afflicted with the disorder and those derived from non-afflicted patients, whereby the subject is afflicted with the disorder if the expression level measured in step (b) is consistent with that gene's expression level in corresponding synchronized cells derived from patients afflicted with the disorder, and the subject is not afflicted with the disorder if the expression level measured in step (b) is consistent with that gene's expression level in corresponding synchronized cells derived from non-afflicted patients.