In:
Journal of Clinical Oncology, American Society of Clinical Oncology (ASCO), Vol. 35, No. 6_suppl ( 2017-02-20), p. 118-118
Abstract:
118 Background: The Prostate Cancer Research International: Active Surveillance (PRIAS) study is a large international prospective observational AS study that commenced in 2006. Japan has participated in the study (PRIAS-JAPAN) since 2010, and recruitment remains ongoing. The objective of this study is to define clinical and pathological factors predicting reclassification at the time of 1-year repeat biopsy (re-Bx) based on a Japanese cohort forming part of the PRIAS study. Methods: The inclusion criteria for the PRIAS study are as follows: clinical stage T1c/T2, PSA ≤ 10 ng/ml, PSA density (PSAD) 〈 0.2 ng/ml per milliliter, one or two positive biopsy cores, and Gleason score (GS) ≤ 6 at initial diagnostic biopsy. Baseline clinical characteristics and prostate-specific antigen doubling time (PSADT) at the time of re-Bx were analyzed via multivariate logistic regression with respect to reclassification on the 1-year re-Bx. Results: A total of 711 patients were enrolled in PRIAS-JAPAN by September 2016. Of these, 409 underwent re-Bx at 1-year. The re-Bx acceptance rate was 83.3%. A total of 122 (29.8%) was reclassified whereas 150 (36.7%) had no cancer. Older age, a higher PSAD, a higher positive core rate, and a shorter PSADT were significant predictors of reclassification. Among them, the positive core rate was the strongest predictor for pathological reclassification at 1-year after starting AS. The AS remaining rates at 1, 2, 3, 4 and 5 years were 93.9%, 70.6%, 65.7%, 60.0% and 49.5% respectively Conclusions: An interim analysis of a Japanese AS cohort participating in PRIAS revealed that the positive core rate was strongly associated with reclassification at the 1-year re-Bx. Clinical trial information: UMIN000002874. [Table: see text]
Type of Medium:
Online Resource
ISSN:
0732-183X
,
1527-7755
DOI:
10.1200/JCO.2017.35.6_suppl.118
Language:
English
Publisher:
American Society of Clinical Oncology (ASCO)
Publication Date:
2017
detail.hit.zdb_id:
2005181-5
detail.hit.zdb_id:
604914-X
Permalink