Comparative Analysis of Dosimetry and Treatment Outcomes of Two Different Dose Fractionation Schedules of HDR Brachytherapy in Carcinoma Cervix Amid Covid-19 Pandemic

Background: Cervical carcinoma is the fourth most common cancer and leading cause of cancer related deaths in women worldwide. Brachytherapy is an important part in the treatment of cervical cancer. Delivering HDR Intracavitary Brachytherapy in the Covid-19 era is challenging. Objective: To compare the dosimetry and treatment outcomes between two fractionation schedules of 9Gy in 2 fractions v/s 7Gy in 3 fractions of high dose rate Brachytherapy in patients with locally advanced carcinoma cervix. Methods: A randomized observational study was carried out on 80 histopathologically proven squamous cell carcinoma patients of cervix. All patients were treated with EBRT 50Gy in 25 fractions over a period of 5 weeks (2Gy/#) with concurrent weekly cisplatin 30mg/m2. After assessing fitness for brachytherapy, patients in the study arm received HDR intracavitary brachytherapy in 9Gy for 2 fractions v/s 7Gy for 3 fractions in the control arm. Results: The median time of follow-up was 14 months for the study (range 7 – 20 months). Local control rate was 89.75% for study arm and 92.30% for control arm. One year disease free survival in the study arm was 76.92% as compared to 74.35% in the control arm. Median disease-free survival was better in the study arm (14 months v/s 12 months) with a trend of significant benefit. Rectal and bladder toxicities were comparable in both the arms. Median dose to ICRU bladder and rectal point, and EQD2 dose in both arms were not found to be statistically significant. Conclusion: Both the regimes were found to be safe. Disease response and toxicities were also similar in both the arms. There was a better patient compliance with 9Gy for 2 fractions schedule in view of lesser number of fractions resulting in less hospital visit in the Covid-19 pandemic.