The LRIG2 gene was localized to chromosome 1p13 and had an open reading frame of 1065 amino acids. The LRIG2 protein was predicted to have the same domain organization as LRIG1 with a signal peptide, an extracellular part containing15 leucine-rich repeats, and three immunoglobulin-like domains, a transmembrane domain, and a cytoplasmic tail. The LRIG2 amino acid sequence was 47% identical to human LRIG1 and mouse Lrig1 (also known as Lig-1). Leucine-rich repeat and immunoglobulin-like domain 2 (LRIG2) is an evolutionarily conserved gene. LRIG2 is a growth suppressor of endometrial adenocarcinoma cells. LRIG2 is a transmembrane protein involved in feedback loop regulation of the ERBB receptor family during NMSC. LRIG2 was identified to be up-regulated in various types of squamous cell carcinoma (SCC), but little is known about LRIG2 in cutaneous SCC (cSCC).