# Fan beam computed tomography-guided online adaptive external radiotherapy for cervical cancer achieves pathological complete response: A case report

## TL;DR

A cervical cancer patient achieved complete recovery using a new type of radiation therapy guided by advanced imaging technology.

## Contribution

Demonstrates the first case of pathological complete response using FBCT-guided online adaptive radiotherapy in cervical cancer.

## Key findings

- The patient showed complete resolution of the lesion after treatment.
- Surgical histopathology confirmed no residual cancer.
- FBCT-guided oART was found to be feasible and dosimetrically precise.

## Abstract

Radiotherapy (RT) is an established viable treatment for cervical cancer across all clinical stages. However, the therapeutic ratio of conventional techniques remains suboptimal due to the anatomical proximity of the cervix to critical pelvic organs. The current study presents a case of pathological complete response (pCR) achieved exclusively through preoperative online adaptive RT (oART) guided by fan beam computed tomography (FBCT). A 54-year-old woman presenting with irregular vaginal bleeding was diagnosed with a cervical mass via pelvic imaging. Subsequent histopathological biopsy confirmed invasive papillary squamous cell carcinoma. Preoperative evaluation, supplemented by laboratory and imaging studies, ruled out distant metastases. The patient underwent fractionated oART using a CT-linear accelerator platform. Post-treatment imaging demonstrated complete resolution of the lesion, and surgical histopathology revealed no residual malignancy. This case highlights the feasibility, safety and dosimetric precision of FBCT-guided oART in cervical cancer. The pCR achieved in this case indicates that oART has the potential to improve the treatment of cervical cancer.