Histologic pattern analysis of cutaneous basal cell carcinoma at a tertiary care hospital in South India

Basal cell carcinoma (BCC) is one of the common malignant disease of the skin worldwide. An attempt at a simplified, accurate histologic classification of BCC based on histologic growth patterns is done in this study. This paved way to the concept of risk typing BCC into low and high-risk types. This is a retrospective descriptive study of skin biopsies diagnosed as BCC between 2010 and 2018 in the Department of Pathology in a tertiary care teaching hospital in Karnataka. H&E stained sections were reviewed, histopathologically subtyped and further categorized into high and low risk types. IHC for BerEP4 was done in ten diagnostically challenging cases. The patients were followed up for six months after the study period. 79 cases of BCC were studied with majority of them being classified as high risk BCC (83.54%), with nodular type (51.89%) being the most common histological subtype. BCCs were seen predominantly in patients in the sixth decade with a female preponderance in both high and low risk BCCs. Majority of the patients with genetic predispositions were of young age and included xeroderma pigmentosa and oculocutaneous albinism. IHC for BerEP4 showed strong and diffuse membranous staining in all ten cases. Recurrence was noted in two cases and metastasis following three recurrences was noted in one case. An accurate histologic classification of BCC based on growth pattern is of great significance as it reflects the biological behaviour of the tumour. Risk typing BCC into high and low risk types further guides the management of BCC. High risk categories mandate more aggressive and decisive treatment to prevent recurrences and also helps predict the prognosis for the patient.