POSTN and non-small cell lung carcinoma: Periostin gene expression (at the mRNA and protein level) was shown to correlate with the gender of the NSCLC patients; the value of the mRNA and the gray scale level of protein in the male group was 1.438±0.427 and 3.915±0.663, respectively, while those of the female group were 0.449±0.117 and 1.463±0.202, respectively.