A 42-year-old woman with a history of cervical intraepithelial neoplasia (CIN) 3 treated with loop electrosurgical excision procedure (LEEP) 5 years ago presents with vaginal bleeding and pelvic pain. HPV testing is positive for HPV-16. Pap smear shows atypical squamous cells of undetermined significance (ASCUS). Colposcopy with directed biopsy reveals invasive squamous cell carcinoma of the cervix, FIGO stage IB1. She is counseled about treatment options. Which of the following is the most appropriate first-line definitive treatment for this patient?