Bone scans overstage prostate most cancers at preliminary staging in contrast with PSMA PET: Examine

Bone scans have been discovered to overstage prostate most cancers at preliminary staging in comparison with prostate-specific membrane antigen (PSMA) PET, in line with new analysis revealed within the November problem of the Journal of Nuclear Drugs. The numerous false-positive price of metastases on bone scans implies that definitive remedy for native illness could have been withheld from sufferers inappropriately.

PSMA PET is extra correct than CT and bone scans for staging sufferers with prostate most cancers and, in recent times, has develop into the usual imaging modality at preliminary staging. Practically all prostate most cancers trials have used CT and bone scans for staging, nonetheless, and the easiest way to use these information to sufferers staged with PSMA PET stays unclear.

“Most analysis thus far has targeted on the elevated sensitivity of PSMA PET versus typical imaging corresponding to bone scans and CT,” mentioned Thomas Hope, MD, vice chair of scientific operations and technique within the Division of Radiology and Director of Molecular Remedy on the College of California in San Francisco. “On this examine, my colleagues and I took the alternative method and checked out the place PSMA PET was damaging when bone scans have been constructive.”

The multicenter retrospective diagnostic examine included 167 prostate most cancers sufferers in varied illness states who have been imaged with bone scans and PSMA PET inside 100 days. Three blinded readers interpreted every examine. Utilizing PSMA PET scans because the reference normal, researchers evaluated constructive predictive worth, damaging predictive worth, and specificity for bone scans in addition to inter-reader reproducibility, positivity price, uptake on PSMA PET, and variety of lesions.

Whereas the specificity of bone scans was discovered to be excessive and comparable throughout illness states, the constructive predictive worth of bone scans at preliminary staging was discovered to be a lot decrease than within the general inhabitants. In comparison with PSMA PET, greater than half (57 %) of bone scans at preliminary staging have been discovered to comprise false-positive metastases.

“Fairly than receiving definitive radiation remedy for localized illness, these sufferers could have obtained remedy geared toward stopping the additional unfold of what was incorrectly recognized as metastatic illness,” mentioned Hope “These outcomes carry into query learn how to apply information from scientific trials which might be based mostly on bone scans to sufferers who obtain PSMA PET. Trying on the massive image, this examine highlights the significance of understanding how check traits impression affected person administration.”