Target intelligence / Profile preview

Frameshift Peptide Neoantigen

Molecular classification
Peptide antigen, Neoantigen
01

Overview

Frameshift peptide neoantigens are tumor-specific antigens generated by frameshift mutations (insertions or deletions) in coding microsatellites within cancer cells. These mutations disrupt the normal reading frame, producing unique peptide sequences not found in healthy tissues. Due to their foreign nature, they are highly immunogenic and can serve as targets for cancer immunotherapy, particularly in MSI-high tumors.

Other names
FSP neoantigenFrameshift-derived neoantigenIndel-derived neoantigen
02

Mechanism of action

Vaccines stimulate T cells to recognize and kill tumor cells expressing the frameshift peptide neoantigen. Immune checkpoint inhibitors can enhance the T cell response.

03

Biological functions

Antigen presentationT cell activationImmune responseTumor rejection (potential)
04

Disease associations

CancerMicrosatellite instability (MSI)-high cancersLynch syndrome-associated cancers
05

Safety considerations

Off-target effects (potential, but unlikely due to tumor specificity)Autoimmunity (potential, but considered low risk)Cytokine release syndrome (potential, but generally mild in clinical trials)
06

Interacting drugs

Vaccines (FSP-based)

1 more in the full profile.

07

Biomarkers

MSI statusMMR deficiencyPresence of specific frameshift mutations (e.g., AIM2, HT001, TAF1B)HLA type (for peptide binding prediction)T cell response to FSP

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