Fig. 2From: Thyroid transcription factor-1 as a prognostic indicator for stage IV lung adenocarcinoma with and without EGFR-sensitizing mutationsPFS in patients who received cytotoxic chemotherapy as first-line treatment stratified by TTF-1 status (a) and in patients with TTF-1-positive expression who received cytotoxic chemotherapy as first-line treatment with or without pemetrexed (b). Abbreviations: TTF-1, thyroid transcription factor-1; PFS, progression free survivalBack to article page