ACE2 and lung cancer: However, CTSL expression value was 53.1 NX and 49.3 FPKM, in the respective tissues, which was 66.4-fold (53.1/0.8=66.4) higher than ACE2 mRNA expression in normal lungs (Figure 6B), and 54.8-fold (49.3/0.9=54.8) higher than ACE2 mRNA expression in the lung cancers (Figure 6C).