ERCC4 and cancer: It was found that the proportions of XPF (−) and XPC (−) were 54.4% and 50.0% in the high grade papillary cancer tissue, 39.7% and 37.9% in PUNLMP cancer tissues and 49.5% and 45.2% in low grade papillary cancer tissues (Table 2 and Fig. 2).