Is oral lichen planus a contraindication for immunotherapy in a patient with recurrent oral SCC?

I have personally given Pembrolizumab to a patient with an oral SCC who had underlying lichen planus. The patient had a good response to therapy, but I also treated the patient with a conditioning regimen of steroids during treatment so as not to exacerbate the lichen planus. I gave prednisone 40 mg...