Reirradiation Practice in Gynecological Cancer: Insights from a National Survey in Spain.

Purpose: Given the lack of standardisation in gynecological cancer reirradiation, the Gyneacologial Radiation Oncology (GINECOR) working group on behalf of the Spanish Society of Radiation Oncology (SEOR), works towards to inquire the current state of reirradiation practices among the radiation oncology departments in Spain.

Methods: An online 37-question survey was sent to all GINECOR members, representing most Spanish centers. The survey addressed general aspects of reirradiation, including experience, reirradiation sites, and techniques used. It included seven clinical case scenarios on reirradiation, and a final section on technical aspects of external beam radiotherapy (EBRT) and brachytherapy (BT) treatment. Descriptive statistics were used for data analysis.

Results: Out of 58 centers, 29 responded, with 51.7% performing ≥ 5 reirradiation cases annually. While most centers offer multiple techniques, only 16/29 have access to BT. For in-field local relapse with surgery contraindicated, 79.3% performed BT in endometrial cancer, but only 27.5% treated with BT in cervical cancer recurrence. In this case, 17.2% used SBRT. For endometrial and cervical cancer, 44.8% and 65.4% of centers prescribed doses based on organ-at-risk tolerance, respectively. For pelvic wall/parametrial in-field relapse, 46.4% of the centres reirradiated with stereotactic body radiotherapy (SBRT), and 32.1% with BT. In nodal reirradiation, SBRT was preferred by 90% of centers. Variability was observed in target volume definitions for EBRT and proton therapy.

Conclusions: Reirradiation for gynecological cancer remains unstandardized, presenting significant challenges in clinical practice. To improve reirradiation protocols in gynecological cancer, the GINECOR working group is currently conducting a systematic review and formulating Delphi recommendations.