Immatics use of Parsortix in 3 of their Anzu-cel(IMA203) cancer6 Dec 2025 22:06
Drug trials. Digging deeper here. Parsortix might be crucial for this potential cancer drug treatment.
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A.I.
Why do Immatics Inc. use Parsortix in their IMA(203) cancer drug trials but not in other cancer drug trials?
Immatics Inc. uses the Parsortix system for its IMA203 (anzu-cel) cancer drug trials and at least two other trials as a core component of its "liquid biopsy" approach to identify and monitor the specific PRAME target protein expression on circulating tumor cells (CTCs).
Why Parsortix is Used in IMA203 Trials
The specific use of the Parsortix system relates directly to the mechanism of action of IMA203 and the unique requirements for patient screening and monitoring in T-cell receptor (TCR) therapies.
PRAME Target Identification: The IMA203 therapy is an engineered T-cell therapy that targets a specific peptide derived from the PRAME protein, which is expressed inside cancer cells. For the drug to be effective, the patient's cancer cells must display this particular PRAME target on their surface, and they must be HLA-A*02 positive.
Non-Invasive Patient Stratification: The Parsortix system allows Immatics to capture intact, viable CTCs from a simple blood draw (a "liquid biopsy"), which is much less invasive than a traditional solid tissue biopsy. This enables them to screen a broad range of cancer patients efficiently to determine if they are suitable candidates for the trial, i.e., if their tumors are PRAME-positive.
Monitoring and Analysis: The captured CTCs can be analyzed for DNA, RNA, and protein biomarkers, including the PRAME protein expression status, allowing researchers to monitor the drug's effectiveness over time and track how the tumor changes or develops resistance.
Harvesting Viable Cells: A key advantage of the Parsortix system is its ability to harvest live, intact, and uncontaminated CTCs based on their size and deformability, rather than using a general antibody-based capture method. This is crucial for the detailed, multi-platform molecular analysis required for developing precision cancer therapies.
Use in Other Trials
Contrary to the premise that it's only used for IMA203, reports indicate Immatics uses the Parsortix system in at least three of their cancer drug trials, including the Phase 3 SUPRAME trial for IMA203 (anzu-cel). The specific details for other trials (IMA201, IMA202, IMA204) are less publicized, but the rationale for using Parsortix likely applies to any of their therapies that require the identification and monitoring of specific intracellular protein targets (like PRAME) via CTC analysis.
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