PS-17-020 RASSF1A hypermethylation is associated to the presence of tumoral cells detected by One-step Nucleic Acid Amplification (OSNA) A. Córdoba * , F. Vicente, N. Perez Janices, J. Perez Vizcaino, E. Gochi, N. Torrea, D. Guerrero * Hospital Navarra, AP, Pamplona, Spain