PrIMe is based on the Oncomine Comprehensive Assay Plus, which is used for the analysis of 500+ genes associated with targeted and immuno-oncology therapies. This assay detects relevant SNVs, indels, CNVs, gene fusions, splice variants in addition to TMB, PD-L1 and MSI immunotherapy response biomarkers, and LOH PARP inhibitors response biomarker all simultaneously.
This assay is the new evolved version of the original assay with robust performance proven to be effective in large clinical oncology trials such as NCI MATCH.
Sequencing is carried out using the Next Generation Sequencing platform Ion GeneStudio™ S5 PrIME System (Thermo Fisher Scientific). For details on assay performance in SNV, Indel and CNV analysis, please refer to table I.
The accreditation of TMB analysis was done in two phases:
PrIMe’s TMB test was compared in silico with WES (Whole Exome Sequencing). This comparison showed a high correlation between WES and PrIMe.
The PrIMe TMB test was compared with another commercially available test with patient samples, which also showed a high correlation in the determination of TMB.
Table I. Assay performance
Assay performance on reference control
Variant Type
Sensitivity
PPV
SNV
98.51%
99.82%
Indel
98.41%
96.88%
Assay performance on CNV
Variant Type
Sensitivity
PPV
CNV gain
97.1%
100%
CNV loss
89.4%
100%
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