A Case of Salvage Maxillectomy for Recurrent Oral Cancer After Boron Neutron Capture Therapy During the COVID-19 Pandemic.

[BACKGROUND] During the COVID-19 pandemic, pedicle flaps instead of free flap transfer were recommended for head and neck reconstruction to reduce infection risk. Boron neutron-capture therapy in Japan was clinically approved in 2020 as a salvage radiotherapy for recurrent head and neck cancer following chemoradiotherapy. The efficacy and safety of salvage surgery following boron neutron-capture therapy remain unclear.

[CASE REPORT] We describe a 57-year-old male with crT4aN0M0 oral cancer after three different forms of radiotherapy including boron neutron-capture therapy, treated by salvage partial maxillectomy with both buccal fat pad and nasoseptal flaps. His postsurgical course was successful, without tracheostomy, and he had no Clavien- Dindo grade 3 or 4 complications. The pathological diagnosis was T4a squamous cell carcinoma with a negative surgical margin. No recurrence or metastasis had occurred at 113 days postoperatively. No opioid consumption was needed postoperatively.

[CONCLUSION] Pathological negative margins were achieved in this case and there were no severe complications. Further accrual of cases salvage surgery following boron neutron-capture therapy is required to clarify treatment strategies for recurrent head and neck cancer.