Annie-
In the study you cited, they didn't just receive neoadjuvant ADT, they received either
chemo + ADT+ RP + limited PLND or RP+ePLND, and it may well be that the men who got ePLND were the ones diagnosed with enlarged LNs. It's hard to draw conclusions.
A similar trial of chemohormonal therapy prior to RP found no significant difference compared in biochemical recurrence compared to historical data:
Long term oncologic outcomes of a Phase II trial of neoadjuvant chemohormonal therapy followed by radical prostatectomy for patients with clinically localized, high-risk prostate cancerThere is a randomized trial in Toronto now of Jevtana+Zytiga+Lupron+RP vs Zytiga+Lupron+RP to see if chemo adds anything:
Anti-Androgens and Cabazitaxel in Defining Complete Response in Prostatectomy (ACDC Trial) (ACDC-RP)When added to EBRT for high risk, chemo had a very small positive benefit (If I recall correctly, 5-yr bRFS increased from 89% to 92% with it), so I'd expect no more than that if added to RP.
As far as hormone therapy (without chemo) goes, there was a randomized trial of RP+flutamide (an antiandrogen) vs. RP alone that found no survival benefit to the additional hormone therapy
Prospective Randomized Trial Comparing Flutamide as Adjuvant Treatment versus Observation after Radical Prostatectomy for Locally Advanced, Lymph Node-Negative Prostate CancerAs for PLND vs. ePLND, most of the data come from Europe where ePLND has been more standard. With the advent of better detection techniques, it is becoming more popular in the US. In cases like schoolpsych, where he is known to be N1, there is a direct correlation between the number of nodes removed and survival:
More Extensive Pelvic Lymph Node Dissection Improves Survival in Patients with Node-positive Prostate CancerAnatomical Extent of Pelvic Lymph Node Dissection: Impact on Long-Term Cancer-Specific Outcomes in Men with Positive Lymph Nodes at Time of Radical ProstatectomyThe trade-off is that complications from ePLND are greater than PLND. If there are complications, it is usually lymphoceles or lymphedema that is transient, but there may be serious cases too.