Would you offer RT alone to an elderly woman with squamous cell carcinoma in-situ of the vulva, distal vagina, and periurethral area?

I have had such a patient; multiply recurrent over a relatively large field such as this case. I gave her RT alone (45-50.4Gy) to central structures with large margin (no nodal treatment) and she was recurrence free for 5 years (last time I saw her).

I would rebiopsy if clinically looks like invasive cancer and manage accordingly.