Nomogram estimate for individual’s risk for nonlocalized disease on prostate-specific membrane antigen PET\/CT linked to long-term outcomes<\/p>\n<\/h3>\n
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WEDNESDAY, Dec. 15, 2021 (HealthDay News) — The probability of nonlocalized upstaging on prostate-specific membrane antigen (PSMA) positron emission tomography\/computed tomography (PET\/CT) may be prognostic of long-term outcomes in high-risk prostate cancer, according to a study published online Dec. 13 in JAMA Network Open<\/em>.<\/p>\n Michael Xiang, M.D., Ph.D., from the University of California in Los Angeles, and colleagues examined the prognostic significance of a nomogram that models an individual’s risk for nonlocalized upstaging on PSMA PET\/CT and compared its performance with existing risk-stratification tools in a cohort study of 5,275 patients diagnosed with high-risk or very high-risk prostate cancer. The biopsy Gleason score, percentage positive systematic biopsy scores, clinical T category, and prostate-specific antigen level were included in a nomogram to calculate PSMA upstage probability.<\/p>\n The researchers found that 36 percent of the patients had biochemical recurrence (BCR), 16 percent developed distant metastasis (DM), and 5 percent died of prostate cancer during a median follow-up of 5.1 years. PSMA upstage probability significantly predicted all clinical end points, with eight-year C-indices of 0.63, 0.69, 0.71, and 0.60 for BCR, DM, prostate cancer-specific mortality (PCSM), and overall survival, respectively. Compared with other risk-stratification tools, the nomogram performed favorably.<\/p>\n “The PSMA nomogram was designed to predict the positivity of PSMA PET\/CT at initial diagnosis, without regard to eventual clinical outcomes, but interestingly, this PSMA PET\/CT-based tool provided better risk discrimination than existing tools that were designed specifically to predict clinical outcomes,” Xiang said in a statement.<\/p>\n Several authors disclosed financial ties to the biopharmaceutical industry.<\/p>\n