Salvage (Re)radiation in Oligometastatic and Oligorecurrent Cervical Cancer

Abstract

Purpose: In patients with recurrent or metastatic cervical cancer, the median survival time is 13 to 24 months based on the choice of palliative systemic chemotherapy. Evolving evidence suggests that the addition of radiation may lead to improved survival.

Methods and materials: Consecutive patients treated with radiation with or without systemic chemotherapy for oligometastatic or oligorecurrent disease within the period from 2017 to 2020 were included. All patients received systemic chemotherapy consultation and radiation to relapsed or metastatic sites. Progression-free survival (PFS) was determined as the period between diagnosis of relapse or metastasis and the last progression of the disease. Overall survival (OS) was defined as the time between the date of diagnosis of relapse or metastasis and follow-up or death. The effect of various prognostic and predictive factors was estimated using the Kaplan-Meier method and log-rank test.

Results: Fifty-eight consecutive patients were included. The median time to relapse was 18 months (8-205 months). At the time of first relapse, 34.4% of patients (n = 20) had locoregional relapse, 32.8% (n = 19) had distant nodal metastases, and 32.8% (n = 19) had visceral metastases. The relapse was within previously irradiated portals in 34.5% (n = 20), out of field in 50% (n = 29), and both in 15.5% (n = 9) of patients. Overall, 56% of patients (n = 33) received systemic chemotherapy. The radiation therapy dose in equivalent doses of 2 Gy at the time of retreatment was 44 Gy (31-68 Gy). The median PFS and OS from the date of first relapse were 16 (12-19) and 28 months (2-108), respectively. Grade ≥3 toxicity was observed in 19% of patients. No patient- or treatment-related factor was identified as predictive of OS on univariate analysis.

Conclusions: The use of potentially radical doses of radiation, including reirradiation at locoregional or distant oligorelapse or metastasis, is associated with encouraging PFS and OS in patients with cervical cancer.