Data from one of the largest studies performed on over 122,000 men comparing RT to prostatectomy found that the radiation-associated second malignancy rates were 1 in 290 (8). Remember, this 0.3% absolute risk is radiotherapy (RT) compared with no RT. Dr Stone cited data demonstrating a relative 18% increased risk in second cancers from implant to combination therapy (4.7% to 5.7%); however, this buy Talazoparib would correlate to an absolute increased risk of only 0.05% when adding supplemental EBRT over implant alone! Lastly, Dr Stone is correct

that the upfront costs of supplemental EBRT are more expensive than implant alone. However, the Markov model he cited reported by Cooperberg et al. was driven by the find more immense increased toxicity with combination therapy and assumed a fourfold higher risk of acute GI toxicity and nearly twofold increase in GI late toxicity with the additional of supplemental EBRT (9). Based on prospective data from the RTOG and CALGB for combination therapy cited previously, these estimates are exaggerated [5] and [10]. Assuming

a minimal increase in toxicity, and a conservative estimate of approximately 10% improvement in biochemical control with the addition of supplemental EBRT (Cooperberg estimated 12%), the costs of salvage therapy will dominate the overall costs of therapy. The estimated annual cost of a biochemical recurrence treated with ADT is $2566, one-time cost of salvage RT is $27,586, and salvage prostatectomy is $8547. With success rates of salvage therapy often less than

50%, coupled with the costs of increased chronic toxicity from salvage therapies, the benefit of supplemental EBRT likely outweighs any initial upfront cost saving of implant alone for patients with intermediate-risk disease. In summary, dose escalation has a proven benefit for intermediate-risk prostate cancer. Further dose escalation appears to further enhance biochemical and local control, and Alanine-glyoxylate transaminase this can readily be achieved with supplemental EBRT while providing the needed extraprostatic coverage for this cohort of patients. Supplemental EBRT is safe with very low rates of severe late toxicity, clinically minute increased risk of secondary radiation included malignancies, and likely comparable costs to implant alone. We agree that low volume intermediate-risk disease can be adequately treated with implant alone, yet for many patients with moderate or large volume disease, we believe that the addition of supplemental EBRT is paramount in achieving durable long-term tumor control and the most efficacious radiotherapeutic treatment intervention for these patients.