PGR and neoplasm: When comparing the PR status between resection specimens and CNBs using the RT-PCR results, a total of 7 tumours were found to be discordant, and 43 were concordant (86%): 3 cases showed conversion from a PR-positive resection specimen to a PR-negative CNB, while 4 cases showed conversion from a PR-negative resection specimen to a PR-positive CNB.