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Subpathologies and genomic classifier for treatment individualization of post-prostatectomy radiotherapy
Ramotar, M. Chua, M. L. K. Truong, H. Hosni, A. Pintilie, M. Davicioni, E. Fleshner, N. E. Dicker, A. P. Bristow, Robert G He, H. H.
Ramotar, M.
Chua, M. L. K.
Truong, H.
Hosni, A.
Pintilie, M.
Davicioni, E.
Fleshner, N. E.
Dicker, A. P.
Bristow, Robert G
He, H. H.
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Abstract
Purpose/objective: Risk-stratification for post-prostatectomy radiotherapy (PORT) using conventional clinicopathologic indexes leads to substantial over- and under-treatment. Better patient selection could spare unnecessary toxicities and improve outcomes. We investigated the prognostic utility of unfavorable subpathologies intraductal carcinoma and cribriform architecture (IDC/CA), and a 22-gene Decipher genomic classifier (GC) in prostate cancer (PCa) patients receiving PORT.
Material/methods: A cohort of 302 men who received PORT at 2 academic institutions was pooled. PORT was predominately delivered as salvage (62% of cases); 20% received HT+PORT. Specimens were centrally reviewed for IDC/CA presence. In 104 cases, GC scores were determined. Endpoints were biochemical relapse-free (bRFR) and metastasis-free (mFR) rates.
Results: After a median follow-up of 6.49-years, 135 (45%) and 40 (13%) men experienced biochemical relapse and metastasis, respectively. IDC/CA were identified in 160 (53%) of cases. Men harboring IDC/CA experienced inferior bRFR (HR 2.6, 95%CI 1.8-3.2, P<0.001) and mFR (HR 3.1, 95%CI 1.5-6.4, P = 0.0014). Patients with GC scores, 22 (21%) were stratified low-, 30 (29%) intermediate-, and 52 (50%) high-risk. GC low-risk was associated with superior bRFR (HR 0.25, 95%CI 0.1-0.5, P<0.001) and mFR (HR 0.15, 95%CI 0.03-0.8, P = 0.025). On multivariable analyses, IDC/CA and GC independently predicted for bRFR, corresponding to improved discrimination (C-index = 0.737 (95%CI 0.662-0.813)).
Conclusions: IDC/CA subpathologies and GC predict for biochemical relapse and metastasis beyond conventional clinicopathologic indexes in the PORT setting. Patients harboring IDC/CA are at higher risk of relapse after maximal local therapies, thus warranting consideration for treatment intensification strategies. Conversely, for men with absence of IDC/CA and low GC scores, de-intensification strategies could be explored.
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Date
2021
Publisher
Collections
Keywords
Type
Article
Citation
Ramotar M, Chua MLK, Truong H, Hosni A, Pintilie M, Davicioni E, et al. Subpathologies and genomic classifier for treatment individualization of post-prostatectomy radiotherapy. Urologic Oncology: Seminars and Original Investigations. 2021 Sep.