“…15,16,18,[20][21][22][23][24][25] Low-risk cSCC (<2 cm, depth not beyond dermis, good differentiation grade) metastasize only in 0-3%. [26][27][28][29] Presence of risk factors, like large tumour size (>2 cm), deep infiltration, location on the lip or ear, poor differentiation grade and perineural and lymphovascular invasion increase the risk for metastasis up to 40%. 2,16,23,30,31 Currently, tumour depth is identified as the most important risk factor for metastasis.…”