New Research from the Caris Precision Oncology Alliance Finds Prognostic and Predictive Drug-Induced Gene Signatures for Colorectal Cancer Patients
Caris Life Sciences® (Caris), the leading molecular science and technology company actively developing and delivering innovative solutions to revolutionize healthcare, to present findings that provide a deeper understanding that tumor expression of genes related to extent of drug exposure, stratified by p53 status, is associated with clinical outcomes on the common chemotherapeutic regimens used to treat metastatic colorectal cancer (CRC). These results will be presented at the 2022 American Association for Cancer Research (AACR) Annual Meeting being held April 8 – 13, 2022 in New Orleans, Louisiana.
The research with poster titled, “Prognostic and predictive drug-induced gene signatures for colorectal cancer patients personalized based on p53 status and treatment with FOLFOX, 5-FU, oxaliplatin or irinotecan” (Abstract #1231), was led by Wafik El-Deiry, M.D., Ph.D., FACP, Director of Brown University’s Legorreta Cancer Center, Associate Dean at the Warren Alpert Medical School, a member of Caris’ Precision Oncology Alliance (POA). Caris’ POA is a growing network of leading cancer centers across the globe that collaborate to advance precision oncology and biomarker-driven research. This work is being presented in New Orleans by Lindsey Carlsen, a Pathobiology graduate student in the EL-DEIRY Lab at Brown.
The goal of this study was to identify predictive biomarkers for chemotherapies used in CRC. The study used CRC cell lines to identify differentially expressed genes following 5-fluorouracil, irinotecan, or oxaliplatin treatment and stratified the signatures based on p53 status. From these in vitro studies, the researchers then examined whether these genes and gene signatures could predict CRC patient outcomes following chemotherapy (FOLFOX, 5-fluorouracil, irinotecan or oxaliplatin). 2,983 wild-type and 6,229 loss-of-function p53 CRC patient samples were analyzed by DNA/RNA next-generation sequencing at Caris Life Sciences. Real-world survival outcomes were inferred from insurance claims data and Kaplan-Meier estimates. Both prognostic and non-prognostic gene expression had a significant effect on survival outcomes following specific drug treatments.
“This study helps us understand the importance that gene signatures have in demonstrating an enhanced predictive ability compared to individual transcripts,” said El-Deiry. “Bridging basic and clinical research, this research allows us to better understand which therapies are more likely to benefit CRC patients.” The study found that tumor expression of genes related to drug exposure can predict outcomes after chemotherapy treatment:
- High EGR1 and FOS mRNA independently predict response to FOLFOX in patients with wild-type p53 tumors.
- Low CCNB1 mRNA correlates with good prognosis of CRC patients with tumors harboring TP53 loss of function mutations.
- Low expression of BTG2 predicts better prognosis in patients with MSI-High TP53 mutated tumors.
- Gene signatures may demonstrate enhanced predictive ability as compared to individual transcript effects.
“Caris is focused on biomarkers that can predict patient response to the newest therapies, but also tried and true chemotherapies like FOLFOX,” said W. Michael Korn, M.D., Chief Medical Officer at Caris. “We are excited to see the translational research capability empowered by the tremendous multi-omic data and analytical tools that Caris has developed and continues to make progress on.”
Caris’ comprehensive molecular profiling assesses whole exome (DNA), whole transcriptome (RNA) and protein expression, providing an unmatched resource and the ideal path forward to conduct the translational research to accelerate discovery for detection, diagnosis, monitoring, therapy selection and drug development to improve the human condition.
Caris will present additional data from studies demonstrating the critical role of precision medicine and molecular profiling in the treatment of cancer. All presentations will be made available online through Caris’ website beginning April 8, 2022.
Additional Presentations Reveal Impact of Comprehensive Molecular Profiling and Potential Clinical Actionability
- Comprehensive characterization of FGF/FGFR alterations in invasive breast cancers (Abstract #5793)
FGFR signaling is central for cancer cell proliferation, migration, angiogenesis and survival; FGFR alterations have become clinically actionable in increasing number of cancer types. This study evaluated the incidence and characterization of numerous FGF/FGFR alterations in over 12,000 invasive breast cancers and highlighted the tremendous heterogeneity of FGF/FGFR alterations in various histologic and molecular subtypes as well as different metastatic sites of breast cancer. Further, the associations of FGFR alterations and resistance to therapies were shown in a large clinical database with matched molecular results.
- Genomic and immune characteristics of EGFR subtypes in non-small cell lung cancer (NSCLC) (Abstract #4119)
While EGFR mutant NSCLC tumors generally are resistant to PD-1/PD-L1 inhibitors, a small subset of patients can have durable responses. EGFR-mutant tumors demonstrate significant molecular heterogeneity, however, there is a lack of clarity on the genomic and immune profiles of EGFR mutation subtypes, and further elucidation of this may help in identifying patients likely to respond to immune based therapies. Leveraging the multi-omic molecular data generated by Next-Generation Sequencing of DNA and RNA on a large cohort of NSCLC tumors, this study confirms the decreased immunogenicity associated with most subtypes of EGFR mutations manifested by biomarkers including PD-L1, TMB and CD8+ T cell infiltration; and reveals rare EGFR mutations associated with favorable immune profile that may suggest responsiveness to immune therapy.
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