Results of IHC analyses of DDX39A, HMGA1, HMGA2, HOXC9, and PBX1 expression in tumor samples.

The percentage of antigen-positive tumor cells (TC) was counted and categorized into five levels: - (0% positive TC), +/- (1-10% positive TC), + (11-50% positive TC), ++ (51–80% positive TC), and +++ (81–100% positive TC). The intensity of immunostaining (immunoreactivity, IR) was classified as none (0), weak (1), medium (2), or strong (3). PQ, poor quality of the specimen (impossible to perform a correct evaluation for the respective biomarker). Sample No. 13 was not available for this IHC analysis, sample No. 14 was excluded due to its overall poor quality.