Benzinga | Dec 6, 2021 08:14AM EST

Guardant Health Presents Data Demonstrating Utility Of Comprehensive Genetic Profiling With Guardant360 Liquid Biopsy Test To Guide Treatment For Advanced Breast Cancer Patients At 2021 San Antonio Breast Cancer Symposium

sGuardant Health, Inc. (NASDAQ:GH), a leading precision oncology company, today announced it will present new data demonstrating the benefits of using the Guardant360(r) liquid biopsy test to help guide targeted therapy options for patients with advanced breast cancer at the 2021 San Antonio Breast Cancer Symposium (SABCS) on December 7-11. These studies were based on data from the GuardantINFORM(tm) real-world clinical genomic platform, which features extensive de-identified genomic data and aggregated commercial payer claims from advanced cancer patients who received the Guardant360 liquid biopsy assay.

Data from one study (Abstract P5-13-29) confirmed that patients with BRCA1/2 reversion mutations, thought to cause acquired therapeutic resistance, experienced worse survival outcomes when treated with a PARP inhibitor as compared to patients without reversion mutations. The study also validates recent advancements in homologous recombination deficiency (HRD) assessment in the Guardant360 lab developed test (LDT), detecting additional inactivating alterations in BRCA1/2, including copy number loss and large genomic rearrangements. These data further demonstrate the Guardant360 test's ability to reliably identify patients with advanced breast cancer who are most likely to benefit from PARP inhibitor treatment.

Another study (Abstract P1-18-07) using the GuardantINFORM platform demonstrated that, for advanced breast cancer patients with PIK3CA mutations identified using the Guardant360 liquid biopsy and subsequently treated with alpelisib, there was no significant difference in treatment outcomes regardless of whether they had clonal or subclonal PIK3CA mutations. This suggests patients with these mutations may benefit from alpelisib targeted therapy irrespective of mutation clonality.

"These studies further support the tremendous value that our Guardant360 liquid biopsy test and GuardantINFORM real-world clinical genomic platform bring to physicians, and most importantly the patients they treat," said Helmy Eltoukhy, Guardant Health Co-CEO. "Guardant360 identifies mutations driving the cancer, which enables the physician to match a patient with the right precision therapy without the need for a tissue biopsy, which can be difficult and time-consuming, potentially delaying treatment for patients with advanced breast cancer."

Full List of Guardant Health Presentations:

* Analytical and clinical validation of a ctDNA assay for detecting copy number loss and structural rearrangement variants contributing to homologous recombination and repair (HRR) deficiency (Abstract Number: P5-13-29)

* Impact of PIK3CA mutation (PIK3CA-mt) clonality on alpelisib (ALP) activity based on real-world evidence (RWE) following liquid biopsy testing (Abstract Number: P1-18-07)

* SOLTI-1903 HOPE: Real-world clinical practice study to assess the impact of using genomic data on the next treatment decision making-choice in patients with locally advanced or metastatic breast cancer in Spain (Abstract Number: OT2-06-01)

* Early changes in circulating tumor DNA and its effect on clinical outcomes in patients with advanced breast cancer receiving the CDK4/6 inhibitor palbociclib: Genotyping results from POLARIS (Abstract Number: P1-18-05)

The full abstracts can be found at the official SABCS website here.