As shown in Fig. 2a and Additional file 3: Figure S1A, XPA mRNA expression was significantly higher in all CDDP-resistant compared to -sensitive GCT cell lines, while ERCC1 mRNA expression levels were either unchanged or slightly higher in CDDP-resistant vs -sensitive lines (Fig. 2b and Additional file 3: Figure S1B). The gene discussed is ERCC1; the disease is granular cell tumor.