CELCC 2014 Abstracts P18. Predictive role of serum tumor markers NSE and TK in patients with advanced-stage NSCLC treated with EGFR-TKIs Ondrej Fiala, Milos Pesek, Jindrich Finek, Lucie Benesova, Marek Minarik, Zbynek Bortlicek, Ondrej Topolcan