KRAS and Pleural effusion: We employed digital droplet polymerase chain reaction (ddPCR) in order to detect KRAS codon 12/13 and 61 mutations, as well as TP53 CNA in pleural fluid and cell pellets of 45 patients with pleural effusions from our cohorts in Munich, Germany (Klotz et al, 2019a, 2019b).