For cutaneous SCC of the cheek with microscopic PNI, which nodal levels, if any, do you prophylactically treat?

Adjuvant radiotherapy for cutaneous squamous cell carcinoma (cSCC) can be a complicated subject because of the limited available data. Perineural invasion (PNI) is a reason to consider adjuvant radiotherapy, because several high-quality clinicopathologic correlative analyses have suggested that pati...