However, shotgun proteomics data (available for 4 kinases, Additional file 6) indicated that SYK is strongly overexpressed within the SCLC phenotype compared to normal tissue (high "SCLC vs. Bronchial epithelium Rate ratio" and "SCLC vs. Alveolar epithelium Rate ratio", column J and M in Additional file 6, respectively). Here, SYK is linked to small cell lung carcinoma.