Review Article

The Current Role of Androgen Deprivation in Patients Undergoing Dose-Escalated External Beam Radiation Therapy for Clinically Localized Prostate Cancer

Table 1


Data SourceTypeArmsPopulationToxicity Results

RTOG 85–31 [4]Prospective randomized trialWPRT + boost to 65–70 Gy (cT3, pT3, LN+)Total: 189
RT (65–70 Gy) + ADT (indefinite)
RT (65–70 Gy) alone
CR of CV
death:
11%
14%
10-year OS benefit for all patients; OS benefit for Gleason 7–10 in subset analysis.

RTOG 86–10 [5]Prospective randomized trialWPRT + Boost (66–70 Gy) ±2 mos. (nADT) and 2 mos.
(cADT). (Locally advanced disease).
Total: 471
RT + ADT (4 mos)
RT (alone).
CR of CV
death:
14%
11%
Significant benefit in DM, ↑CSS, and ↑DFS, OS advantage for Gleason score <7.

RTOG 92–02 [6]Prospective randomized trialWPRT + Boost to 65–70 Gy + 2 mos. nADT + 2 mos. cADT ± 2 year aADTTotal: 1554
RT + ADT (28 mos.)
RT + ADT (4 mos.)
CR of CV death:
13.5%
11%
Survival advantage for pts. with Gleason score 8–10.

D’Amico et al. [7, 8]Prospective randomized trial45 Gy (prostate and seminal vesicles) + boost to 70 Gy ± 6 mos. ADT
(nADT, cADT, or aADT).
Total: 206
RT + nADT
or cADT or ADT
RT (alone)
Age:
>65 yrs. 6 mos. HT Fatal MIs.
7%
5-6%
OS advantage for pts. with hormonal manipulation with minimal or no comorbidities.

RTOG 94–13 [9]Prospective randomized trial70.2 Gy (50.4 to WP if on WP arms). 4 arms:
WPRT + nADT
PORT + nADT
WPRT + aADT
PORT + aADT
Total: 1279
WPRT + nADT + Boost ( )
PORT + nADT ( ) WPRT + aADT ( )
PORT + aADT ( )
Acute radiation toxicity:
WPRT + nADT = (8%)
PORT + nADT = (5%)
WPRT + ADT = (3%)
PORT + ADT = (3%).
Grade 3 GI toxicity:
WPRT + nADT = 5%
PORT + nADT = 1%
WPRT + ADT = 2%
PORT + ADT = 2%
Improved PFS in WPRT + nADT arm as compared to others.

TROG 9601 [10]Prospective randomized trial66 Gy + 0 versus 3 versus 6 mos. nADT (T2b-T4).Total: 818
3 arms:
RT (alone)
RT + 3 mos. nADT
RT+ 6 mos. nADT
Improvement in 5-year LF, bFFS, and DFS, freedom from salvage with 3 or 6 mos nADT.

EORTC 22961 [11]Prospective randomized trial70 Gy (50 Gy WPRT) + 6 mos.
cADT versus 3 yrs. on aADT
Total: 970
WPRT + 6 mos.
cADT
WPRT + 3 yrs. aADT
No difference in fatal cardiac events (3-4%).
More hot flushes and sexual function
3-year ADT improved overall mortality 19 versus 15.2%.Prostate cancer mortality: 4.7% versus 3.2%.

RTOG 94–08 [12]Prospective randomized trial66 Gy ± 2 mos.
nADT + 2 mos.
cADT
Total: 1989
RT (alone)
RT + nADT (2 mos.) + cADT (2 mos.)
Risk of acute, late GU, GI, and hemat.
Toxicities is same in both arms.
Grade 4 < 3%
Grade 5 < 1%
Short-term ADT before and during RT was associated with significantly decreased DSM and increased OS for IR pts.

EORTC 22863 [13]Prospective randomized trial70 Gy (50 Gy WPRT) ± 3 year goserelin starting on first day of RT. (T3-T4 or T1-T2 Gleason > 7)Total: 415
RT + Goserelin (aADT)
RT (alone)
No difference in 10 year cardiac mortality (8–11%)OS and DFS benefit for patients on combined therapy arm.

Crook et al. [14]Prospective randomized trial3 or 8 mos. of flutamide or goserelin before 66 Gy RTTotal: 378
Flutamide or goserelin (3 mos.) + RT
Flutamide or goserelin (8 mos.) + RT
5-year DFS improvement for high-risk patients in the 8 mos. arm.

Nguyen et al. [28]Meta-analysis of 8 prospective randomized trialsNonmetastatic unfavourable risk PC pts ± ADTTotal: 4141
Nonmetastatic PC + ADT
Control group
ADT use is not associated with an increased risk of CVDADT is associated with a lower risk of PCSM and all-cause mortality.

RTOG: Radiation therapy oncology group, WPRT: whole pelvic radiation therapy, RT: Radiation therapy, mos.: months, ADT: Androgen deprivation therapy, CR: Cumulative risk, CV: Cardiovascular, OS: Overall survival, nADT: Neo-adjuvant androgen deprivation therapy, cADT: Concomitant androgen deprivation therapy, aADT: Adjuvant androgen deprivation therapy, DM: Distant metastases, DSM-Disease specific mortality, DFS: Disease free survival, MI: Myocardial infarction, PORT: Prostatic bed only radiation therapy, LF: local failure, bFFS: Biochemical failure free survival, EORTC: European organization for research and treatment of cancer, TROG: Trans-Tasman Radiation Oncology Group, CVD: Cardiovascular disease related death.