Papillary Urothelial Carcinoma of Bladder

A 64-year-old male smoker presents with painless gross hematuria. Cystoscopy reveals a 2-cm exophytic tumor on the bladder wall with a velvety red patch suggestive of carcinoma in situ (CIS) in the background. TURBT with deep muscle sampling is performed. Gross pathology shows a pink-tan growth with a slender fibrovascular stalk (marked **A** in the diagram) arising from the urothelial surface. Histology demonstrates arborizing papillary structures lined by thickened urothelium with high-grade nuclear pleomorphism and increased mitoses. The lamina propria is invaded (pT1); detrusor muscle is uninvolved. Based on the histological findings of the structure marked **A** and the presence of background CIS, which of the following is the most appropriate next step in management?