Genomic Precision

 A SeraCare blog focused on precision medicine and advanced clinical diagnostics

Three liquid biopsy problems solved by the most patient-like ctDNA reference materials

SeraCare’s new Seraseq™ Circulating Tumor Reference Materials

Posted by Dale Yuzuki on Jul 24, 2017 10:00:00 AM

Clinical genomics laboratories are increasingly looking to liquid biopsy cancer assays to complement their current solid tumor assays. Compared to their solid tumor assay counterparts, circulating tumor DNA (ctDNA) assays offer a different set of challenges to consider for clinical labs.  One of the most important of which, is to develop a set of reagents that are appropriately validated to determine the critical performance of the assay across many parameters.  The ctDNA targets of liquid biopsy assays are typically at much lower allelic frequencies and require a robust and reproducibly designed assay to consistently detect these important variants.

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Topics: patient-like, Reference Material, DNA, ctDNA, Circulating Tumor DNA, cell free DNA, cfDNA, DNA Blend

Dr. Andrea Ferreira-Gonzalez on the Seven Benefits of Clinical Genomics Universal Standardization

The Chair of Molecular Diagnostics, Department of Pathology at Virginia Commonwealth University shares her success story

Posted by Dale Yuzuki on Jun 22, 2017 3:32:52 PM

 As a 25-year veteran of clinical molecular diagnostics, Dr. Andrea Ferreira-Gonzalez has seen many changes in genetic technologies used in the testing laboratory. With the advent of personalized medicine and using multi-gene NGS panels as a laboratory-developed test, Dr. Ferreira-Gonzalez and other experts have agreed to lend their expertise to the design of SeraCare’s reference materials.

 

She and other groups have participated in an interlaboratory test of standardized reference materials for detecting cancer somatic mutations, with results that will be published in the coming months.

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Topics: NGS assays, next gen sequencing, Reference Material, laboratory training, clinical genomics

Clinical Laboratories: You Are Not Alone. (Part II)

"The most effective ways to use QC data to monitor the health of your NGS assay."

Posted by Matt Ryder on Dec 7, 2016 4:00:00 PM

Previously, we wrote about some of the Quality Control challenges that clinical laboratories performing Next Generation Sequencing (NGS) face towards ensuring their assays are safe and effective for guiding medical management decisions.  Reliable access to high quality reference materials is necessary to help overcome these challenges; however, it is not sufficient.  Insights that reference materials provide into the health of an NGS assay are only as good as laboratories’ ability to use their QC data effectively.

With limited time and resources to collect, organize, access, and analyze QC metrics, laboratories may frequently rely on reference materials as binary indicators of Pass/Fail:  As long as the expected endpoint results are obtained, an assay is considered to be performing well.  The drawback of this approach is that it is reactive, rather than proactive:  A sufficient number of failures must occur within a given timeframe before a troubleshooting investigation is performed.  By the time a problem is recognized, resources have been wasted and turnaround times (TAT) delayed; in some cases, fidelity of patient results may even have been put at risk.  Additional time and costs are then incurred as the investigation proceeds.

Specimen analysis by NGS yields a wealth of information in addition to endpoint variant calls that is indicative of assay performance.  Data such as nucleic acid quantity and quality at different steps throughout the workflow (PDF) and sequencing library characteristics are generated every time a reference material is tested.  However, these data must be carefully tracked and trended to allow use as highly informative QC parameters.  For clinical laboratories whose primary focus is on patient testing and reporting, granular QC metrics may not be captured and reviewed as part of routine test monitoring.

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Topics: NGS, NGS assays, next gen sequencing, Reference Material, False Negative, False Positive, Sequencing quality control, ctDNA, qcdata management, QC Challenges

Clinical Laboratories: You Are Not Alone.

“Ensure NGS-based tests for Personalized Medicine are safe and effective for guiding medical management decisions”

Posted by Matt Ryder on Nov 8, 2016 1:06:00 PM

Since the introduction of the GS20 in 2005 by 454 Life Sciences, Next Generation Sequencing (NGS) has found many applications in clinical diagnostics.  As a result of this transition from the long-held gold standard, Sanger sequencing, the primary challenge for clinical laboratories has shifted from data acquisition to ensuring these tests are safe and effective for guiding medical management decisions.

Many laboratories struggle to gain a thorough understanding of the analytic performance characteristics of their NGS tests.  The difficulty arises from the fact that these assays are comprised of highly complex, fragmented workflows, and have many different intended uses.  However, across the various practices currently used for NGS assay development, validation, and performance monitoring, there is a common goal: results must be as accurate, precise, and consistent as possible.

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Topics: NGS, NGS assays, next gen sequencing, Reference Material, False Negative, False Positive, amp2016

Reference Materials for Your Unique Reproducibility Needs

The distinction between accuracy and precision.

Posted by Matt Ryder on Oct 12, 2016 11:06:00 AM

If you took a university introductory statistics course, you may have learned the distinction between accuracy and precision.  It may likely have been presented with an archery analogy, where ‘Accurate’ was represented by arrows loosely clustered around the target’s bull’s-eye, ‘Precise’ was shown as a tight grouping displaced from the center, and ‘Accurate and Precise’ was depicted as what every archer aims for, a tight grouping directly at the bull’s-eye.  Suddenly, words that are used interchangeably in everyday conversation took on dramatically different meanings.


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Topics: Reference Material, NGS, NGS assays, FDA, Sequencing quality control, Precision Medicine, SeraSeq, Tumor Mutation Mix, variants, allele frequencies, Good Manufacturing Practices

FDA-AACR Liquid Biopsies in Oncology Drug and Device Workshop

Important information for assay development and review by the FDA

Posted by Yves Konigshofer on Aug 8, 2016 9:09:00 AM

The presentations during the FDA-AACR Liquid Biopsies in Oncology Drug and Device Development Workshop on July 19, 2016 included several important pieces of information that will likely guide the development of assays and their review by the FDA.

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Topics: FDA, LDT, NGS, Cancer Test, Oncology, ctDNA, Mutation, Diagnostics, Clinical Testing, Circulating Tumor DNA, Reference Material, Precision Medicine, Test Development

IVD Guidance for NGS Manufacturers

Posted by Russell Garlick on Jul 14, 2016 3:30:00 PM

After 17 months of deliberations since its first open meeting February 20, 2015 on NGS IVD assay oversight, the U.S. Food and Drug Administration (FDA) issued DRAFT guidance for Stakeholders and FDA staff. The document “Use of Standards in FDA Regulatory Oversight of Next Generation Sequencing (NGS)-Based In Vitro Diagnostics (IVDs) Used for Diagnosing Germline Diseases” was published online on July 6, 2016. This document (PDF located here) is for analytical validity and not for clinical validation.

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Topics: LDT, FDA, NGS, Clinical Testing, Molecular Diagnostics, Reference Material

Highlights from the 2016 Molecular Medicine Tri-Conference

Diagnosing inherited disease, processing FFPE samples, state-of-the-art oncology in North Carolina, and developments in circulating tumor DNA technology

Posted by Dale Yuzuki on Mar 22, 2016 11:05:00 AM

We are living through a time of rapid change in the clinical genetics laboratory, though at times it may appear that change doesn’t occur fast enough given the challenges within the existing healthcare system. At the recent Molecular Medicine Tri-Conference held in San Francisco March 7 through 11 2016, here are a few summary highlights of the conference.

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Topics: Cancer, Circulating Tumor DNA, Inherited Disease, Genetics, Genomics, ctDNA, Reference Material, Oncology, Rare Disease

Circulating Tumor DNA Poster at Keystone Symposium

Poster Titled “New Technical Approach to Construct ctDNA Materials for use in Characterizing, Developing and Validating Plasma Assays”, available for download

Posted by Dale Yuzuki on Feb 11, 2016 10:57:00 AM

The Keystone Symposia is an organization with 44 years of history on specialized topics across the fields of molecular and cellular biology. This week in Banff, Alberta, Canada is a Keystone Symposia conference called The Cancer Genome, along with a joint meeting on Genomics and Personalized Medicine. Their Twitter description (@KeystoneSymp) describes the Keystone organization as “A catalyst for accelerating life science discovery and connecting scientists within and across disciplines at symposia worldwide”.

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Topics: Cancer Test, Circulating Tumor DNA, Precision Medicine, Variation, Mutation, ctDNA, Test Development, Reference Material, Oncology, SeraSeq

LDT Oversight: Why the FDA makes a point

Laboratory-developed tests are in the spotlight by the US Food and Drug Administration

Posted by Trevor Brown on Dec 21, 2015 1:23:00 PM

Recently, the FDA upped the ante in the ongoing debate over its desire to regulate laboratory developed tests (LDTs) with the release of a report detailing the ‘real and potential harms to patients and to public health’ arising from LDTs.  This debate has been heating up for several years now—not coincidentally with the emergence of precision medicine and the rapid adoption of data-intensive tools such as Next Generation Sequencing (NGS) and the growing pipelines of targeted therapeutics.  One might argue that the horse has already left the barn and the FDA are trying to corral it back in.

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Topics: LDT, FDA, Reference Material

 
 

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