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@jfh1970
@hrhwilliam
I was offered this explanation:

Since my cancer has already involved lymph nodes, the concern is microscopic disease. In that situation, reliable elective coverage matters more than pinpoint targeting. Photon IMRT is more robust and forgiving for microscopic risk, which is why proton therapy doesn’t offer an advantage in my case.

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Replies to "@jfh1970 @hrhwilliam I was offered this explanation: Since my cancer has already involved lymph nodes, the..."

@justwow lymph node involvement makes all the difference. Non-clear margins after surgery is another factor.