Pd-103 Dose De-Escalation for Early Stage Prostate Cancer: A Prospective Randomized Trial

In calendar year 2003, approximately 220, 000 men will be diagnosed with prostate cancer and approximately 30,000 will die. The vast majority of men will be diagnosed with clinically organ-confined disease with potentially curative treatments including radical prostatectomy, external beam radiation therapy and brachytherapy. Within the uro-oncology community, the selection of one modality over another remains controversial.

Over the past decade, transperineal ultrasound-guided permanent prostate brachytherapy using either Pd-130 or I-125 has been increasingly utilized as definitive management for early stage carcinoma of the prostate gland. This resurgence of interest in prostate brachytherapy was the result of several technologic advances including the evolution of transrectal ultrasonography, the development of a closed transperineal approach and the availability of sophisticated treatment planning computers. These imaging and planning advances significantly improved the accuracy of seed placement. In addition, the advent of CT-based postoperative dosimetry in the early 1990's provided a unique opportunity to evaluate quality and proactively predict outcome and complications.

Prostate brachytherapy represents the ultimate 3-dimensional conformal therapy and permits dose escalation far exceeding other modalities. Following permanent prostate brachytherapy with or without supplemental external beam radiation therapy, favorable long term biochemical outcomes have been reported for patients with low, intermediate and high risk features with a morbidity profile that compares favorably with competing local modalities (1,2)2).

Although there is no definitive evidence suggesting that either Pd-103 or I-125 is more efficacious than the other in terms of cure or side effects/complications, preliminary results of a prospective randomized trial suggests that Pd-103 may be more "dose forgiving" than I-125 (3). Long-term results demonstrate cancer eradication is highly correlated with delivered radiation dose. To date, postoperative dosimetry has primarily been described in terms of V 100/150/200 (volume of the gland receiving 100%, 150% and 200% of the prescription dose) and the D90 (the dose delivered to 90% of the prostate gland). Following I-125 monotherapy, A D90 greater than or equal to 140 Gy (day 30 dosimetry) is required for optimal long-term biochemical control (4,5)4)5). A dose of 140 Gy represents 96% of the standard I-125 prescription dose (145 Gy). In contrast, following Pd-103 monotherapy, A D90 greater than or equal to 100 Gy (day 30 dosimetry) and a D90 greater than or equal to 108 Gy (median day 22 dosimetry) have been reported to predict optimal biochemical outcomes (6,7)6)7). These Pd-103 doses represent 80% and 86% of the standard monotherapy prescription dose (125 Gy). In addition, a prospective randomized trial demonstrated that coverage of 90% or more of the prostate by 124 Gy of Pd-103 yields 98% change of being cancer-free three years following treatment (3).

Because of some seed placement uncertainty, however, the pre-plans are designed to deliver a higher radiation dose than necessary to most of the prostate gland (8). Additionally, there is a variable amount of edema that occurs from the implant procedure, moving seeds farther away from each other, again requiring a higher planned dose than actually needed.