How do you approach radiation for a locally advanced prostate cancer with caudal extension into the penis in a patient?

When I have encountered this problem, it has either been a very locally advanced adenocarcinoma or small cell. I'll assume for this question that your patient has an adenocarcinoma. Long-term ADT is probably going to be part of the picture, depending on the Gleason score. I consider the extension into the penis (presumably in this case the penile bulb region) to be part of the GTV, and I will make my usual expansions around defined target volumes, making sure to cover the penile extension and us...