May function as a regulator of the EGFR pathway. Probable tumor suppressor which may function in cell growth, proliferation and adhesion. {ECO:0000269|PubMed:15498789, ECO:0000269|PubMed:15723283, ECO:0000269|PubMed:17270023, ECO:0000269|PubMed:17641538}. This is the function of TMEM8B (transmembrane protein 8B, ENSG00000137103).