Squamous cell carcinoma of the nail unit: a retrospective review of 19 cases in Asia and comparative review of Western literature.

This study provides data of 19 SCCnu cases in Asia. Clinical characteristics of SCCnu in this study were similar to those of reports from Western countries. However, we found a higher frequency of more invasive cases and longer delay to diagnosis in our study; this advocates the need for greater attention on nail disorders among healthcare providers, particularly in Asia.