When I don't know much about
a topic I generally Google it so I can sound smarter than I am.
My 90 seconds of intensive research came up with a BJU meta-study that looked at LVI as an independent indicator. Heres the abstract:
Prognostic significance of lymphovascular invasion in radical prostatectomy specimens.The abstract has a link to the full text (on the right side of the page).
Their conclusion:
The existing literature is conflicting and of insufficient homogeneity to definitively establish LVI as an important independent prognostic factor of biochemical recurrence in prostate cancer prostatectomy specimens. Additional adequately powered studies are required to determine the clinical value of reports of LVI involvement. In the meantime, the use of LVI status as an independent prognostic factor for clinical prognostication and medical decision making is not recommended.It would be more reassuring if they didn't base their negative recommendation on the available research being to scant and too messy, but there you go.
I must admit that I like the suggestions of your rad onc because with the 4+3 and a tertiary 5 I tend to worry about
wait-and-see approaches. But I am aware that it is probably an unreasonable bias and I struggle with it.
Good luck. Keep us in the loop.