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Overall survival of small-cell lung cancer patients according to presence (red) or absence (green) of epithelial (EpCAM, CK19) and neuroendocrine markers (SYP, CHGA). The figures (a) and (c) display samples taken at primary diagnosis, whereas the figures (b) and (d) display samples taken at progression. Log-rank testing was used to compare survival outcomes. epi, epithelial; nec, neuroendocrine.
