CD117 expression was quantified on cytokeratin+ cells by flow cytometry in 58 NSCLC patients 13 of whom were studied with both immunofluorescence and high resolution flow cytometry (simultaneous detection of cytokeratin, DNA, CD44, CD90, CD117, CD133, and hematopoietic cells) (Figure 1, panels A–E). The gene discussed is CD44; the disease is non-small cell lung carcinoma.