In the blood of patient G a larger number of CTCs with phenotypes ALDH+, Axl+CD117+EGF+, CD117+Axl+EGF+CD44+, EGF+Axl+, CD117+EGF+, Axl+SOX2+, and CD90+SOX2+ was found compared to the general group of patients with SCLC (Figure 9). Here, CD44 is linked to small cell lung carcinoma.