PATHWORK DIAGNOSTICS
About PATHWORK DIAGNOSTICS
Pathwork Diagnostics was a pioneering molecular diagnostics company focused on oncology, known for developing the Pathwork® Tissue of Origin Test. This innovative gene expression-based test was designed to assist physicians in identifying the primary site of difficult-to-diagnose tumors, including those that were poorly differentiated, undifferentiated, or metastatic. By analyzing a tumor’s genomic information through microarray-based RNA profiling, the test provided objective classification support when conventional pathology methods were insufficient.
The Pathwork Tissue of Origin Test utilized a proprietary informatics platform to compare the gene expression patterns of an uncertain tumor against a comprehensive database of known tumor types. This approach aimed to enhance diagnostic certainty, thereby enabling oncologists to make more informed, cancer-specific treatment decisions and potentially improve patient outcomes in precision oncology. The test was FDA-cleared as an in vitro diagnostic kit and was also available as a service through Pathwork’s CLIA-certified laboratory.
Pathwork Diagnostics was acquired by Response Genetics in August 2013. As of current information, the company is described as ‘deadpooled’ by some industry trackers, indicating it no longer operates as an independent entity. While not explicitly branded as an ‘AI company’ in the modern sense of deep learning, its reliance on advanced genomic analytics and proprietary informatics platforms for diagnostic insights represented a significant computational advancement in healthcare diagnostics at the time.
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| Key Investors | Abingworth, Advent Venture Partners, Alta Partners, Novus Ventures, Prospect Venture Partners, Venrock, Versant Ventures |
| Partnerships | Novartis (diagnostic discovery collaboration), Kindstar Diagnostics (distribution in China) |
| Acquisitions | Acquired Pathwork Informatics by Predicant Biosciences (2006); Assets acquired by Response Genetics (2013) |
| Technology | Microarray-based RNA profiling, Gene expression profiling, Proprietary analytics, Pathchip® microarray, Affymetrix GeneChip® System |
| FDA Clearances | 1 cleared products (estimated) |
What Physicians Need to Know
Pathwork Diagnostics stands out for physicians by providing crucial genomic insights that transform cancer care. The Pathworku00ae Tissue of Origin Test reduces diagnostic ambiguity for metastatic or poorly differentiated tumors, offering objective classification support when conventional pathology is insufficient. This enables oncologists to prescribe more appropriate, site-specific, and targeted therapies, potentially improving patient outcomes and avoiding the toxicities of less-specific treatments. The test increases physician confidence in treatment approaches and is practical for routine clinical use as it works on formalin-fixed, paraffin-embedded (FFPE) tissues, the most common clinical specimen type. It's available both as a service through their CLIA-certified laboratory and as an FDA-cleared in vitro diagnostic (IVD) kit for clinical laboratories.
The core technology relies on microarray-based RNA profiling, utilizing Pathwork Diagnostics' proprietary analytics and a companion Pathchipu00ae microarray. This Pathchipu00ae microarray runs on the proven Affymetrix GeneChipu00ae System. The test is available as a service through Pathwork's CLIA-certified laboratory and as an FDA-cleared in vitro diagnostic (IVD) kit for clinical laboratories to run themselves.
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