Which one of the following is not included in the treatment of malignant melanoma

Treatment - Surgery is the main treatment. For melanoma <1 mm deep, wide local excision with a 1 cm margin is sufficient. For deeper lesions, a 2 cm margin is recommended as there is no evidence that wider margins make a difference Sentinel node biopsy can be done. Current treatment for biopsy positive nodal disease is block dissection of regional lymph nodes to remove all the lymph nodes in that regional basin. Bailey and love 26th edition 598