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A cancer treatment laboratory in Lewisville made a medical breakthrough that could decrease the risk of the disease returning after a patient has been treated. After somebody has been treated for a cancerous tumor, very small amounts of disease may remain in the body, which traditional tests may miss. Quest Diagnostics, headquartered in Lewisville, has created a new blood test that can identify tiny bits of cancer post-treatment. Currently, Lewisville’s Quest Diagnostics laboratory is the only lab in the country that processes this test for patients and doctors nationwide.

Quest Diagnostics-owned liquid biopsy developer Haystack Oncology is expecting in the next year to bring a new wealth of data supporting the ability of its circulating tumor DNA technology for use in minimal/molecular residual disease (MRD) detection across a variety of indications, especially those where its higher sensitivity may give it a boost over other technologies.

During a talk at the Jefferies Healthcare Services Conference this week, Quest Diagnostics CFO Sam Samad noted developments within several parts of the company's advanced testing business and highlighted blood-based Alzheimer's testing as a particularly strong growth area.

Guardant Health and Quest Diagnostics will collaborate to offer Guardant’s Shield blood-based colorectal cancer test through Quest’s distribution network, the companies said Wednesday. Physicians will be able to order the test through their Quest accounts and electronic health record starting in the first quarter of 2026.

Overall rates of HIV drug resistance declined by nearly 17% between 2018 and 2024, according to a large analysis from Quest Diagnostics published in Open Forum Infectious Diseases. The researchers assessed the prevalence of mutations that confer resistance to nucleoside/nucleotide reverse-transcriptase inhibitors (NRTIs), non-nucleoside reverse-transcriptase inhibitors (NNRTIs), protease inhibitors and integrase inhibitors.