CLCA2 and lung cancer: Among the genes listed in Tables 1 and 2, we focused on the CLCA2 gene since its protein expression status in lung cancer has not been reported previously and we found a significant difference in the median expression value of this gene between the SCCs and ADCs (4,860.0234 versus 5.2242) (Table 1 and Figure 1(b)); furthermore, anti-CLCA2 antibody is available.