Glycoprotein Biomarkers for the Early Detection of Aggressive Prostate Cancer

Abbreviated Name

Hui Zhang Supplement 2012

Lead Investigator

Zhang, Hui L. — Johns Hopkins University School of Medicine

Coordinating Investigator

Zhang, Hui L. — Johns Hopkins University School of Medicine

Involved Investigators

Abstract

The Early Detection Research Network of the NCI is charged with the discovery, development and validation of biomarkers for early detection and prognosis related to neoplastic disease. Our laboratory is an NCI EDRN (U01CA152813) working on "Glycoprotein biomarkers for the early detection of aggressive prostate cancer". This EDRN administratiVE! supplement is a collaboration with Robert Veltri on his project to identify men with very low risk (indolent) prostate cancer (CaP) at the diagnostic biopsy at selection for active surveillance (AS). We will assess biopsy tissue using quantitative nuclear histomorphometric measurements and molecular biomarkers to predict an unexpected catastrophic CaP in such men with indolent CaP. At Johns Hopkins Hospital w1e use the Epstein criteria that includes; PSA density (PSAD) <0.15 ng/mVcm3, Gleason score SS, S2 cons involved with cancer, and ::;;SO% of any core involved with cancer to select AS. Our approach will study 140 AS men (70 with a expected outcome and 70 with a disastrous outcome) using nuclear histomorphometry and pre-qualified biomarkers quantified by digital microscopy. Previously, our laboratory combined measurements of DNA content and (-2)pPSA in the serum and (-5,-?)pPSA in biopsy tissue to identify 7/10 men that would fail surveillance based on the primary diagnostic biopsy. We now will devHiop a clinical, morphological and biomarker 'signature' for identifying severe aggressive disease from a AS diagnostic biopsy. Our approach will combine nuclear morphometry measured by digital microscopy with a unique biopsy tissue biomarker profile (DNA content, Ki67, Her2neu, CACND1 and periostin). Fcr the molecular targets we will use a multiplex tissue blot (MTB) immunohistochemistry method. The Aims o'f our work include 1) to utilize retrospective archival biopsy material from 70 AS cases where the outcome was unexpected and disastrous and collect an equal number of AS cases (n=140) and perform assays for morphology and biomarker targi ts proposed, 2) and predict failure using Cox proportional hazards statistical modeling.

Aims

Aim #1 To select 140 retrospective (n=70 eventually had a catastrophic outcome and another n=70 cases where the outcome is as expected, a very low risk cancer). Dr. Epstein,pathologist, will be responsible for these tasks. Cases available for the project are listed in Table 1— These must be collected,reviewed and marked for cancer areas. Aim #2 Quantitative Nuclear Morphometry (QNM) and Molecular Biomarkers by MTI on AS cohort Optimization of five biomarkers using the Multiplex tissue immunoblotting (MTI)1quarter QNM technology is standardized and requires 15-20 minutes per case and we have 140 cases to run. QNM – this will require at least 5 qurtersa to collect cells from 140 cases, create the database and then analyze. MTI for (-5,-7)ProPSA, Ki67, Her2/neu, POSTN, &CACNA1D - We can only run about 5-6 cases per every 2 days and make one run per week for all the markers. A total of five quarters required.. Aim #3 Construct and validate computerized based histologic classifier using Cox proportional hazards analysis. Dr. Bruce Trock will assist in preparing the Cox proportional hazard models. A proportional hazards model will be developed using the predictors from the best model in Aim 2. For continuous variables with evidence of non-linearity we will explore alternative metrics using restricted cubic splines. We may use several approaches to modeling. If the number of predictors derived in Aim 1 is not large (<1/10th the number of biopsy progression events) we will include all predictors and bootstrap the model. Estimates after all data is collected and audited: 8-10 weeks (part-time basis)

Analytic Method

No analytic method available.

Publications

No publications available at this time for this protocol.

Biomarkers

No biomarkers available at this time for this protocol.

Data Collections

No data collections available at this time for this protocol.

Team Project

Start Date

Jul 1 2012

Estimated Finish Date

Jun 30 2014

Protocol ID

364

Protocol Type

Collaboration

Fields of Research

UNKNOWN

Collaborative Group

Prostate and Urologic Cancers Research Group

Cancer Types

Malignant neoplasm of prostate