The present invention provides methods and kits for identifying a cell that exhibits or is predisposed to exhibiting unregulated growth by detecting hypermethylation of a gene or a regulatory region in at least one gene in the cell. Also provided are methods for diagnosis or prognosis of ovarian cancer in a subject. Also provided are methods of ameliorating ovarian cancer in a subject by administering to the subject an agent that demethylates a hypermethylated gene or regulatory region thereof.