| Comparative Genome Hybridization (CGH) |
| CGH is a technology that can be used to detect genomic copy number variations (CNVs). Tests use labeled tumor and reference DNA hybridized on arrays and differences in probe intensity are measured by scanner. |
| Comprehensive Genomic Profiling (CGP) |
| A type of next-generation sequencing test able to detect all classes of genomic alterations, including cancer biomarkers, from a single sample. |
| Gene Expression Profiling (GEP) |
| A laboratory test that analyzes messenger RNA (mRNA) patterns to determine gene activity; also referred to as gene expression testing, gene expression classifier testing, or gene expression assay. |
| Liquid Biopsy |
| Testing on bodily fluid to identify tumor-derived cells or circulating tumor DNA/RNA used for detection, treatment selection, or monitoring. |
| Measurable Residual Disease (MRD) |
| Very small number of cancer cells or cell contents detectable during/after treatment, often using PCR, flow cytometry, or NGS; indicates residual disease risk. |
| NGS |
| Next Generation Sequencing: techniques that can quickly analyze multiple sections of DNA simultaneously. |
| Risk group definitions (Prostate) |
| Very Low/Low/Favorable Intermediate/Unfavorable Intermediate/High/Very High risk prostate cancer as defined per NCCN v1.2025 clinical and pathological criteria. |
| Multigene analysis |
| For this policy, generally refers to a gene panel containing five or more genes; may include DNA or RNA analyses and algorithmic classifiers. |
| GEO/GEA |
| Gene expression assay — tests that measure expression patterns of defined genes to provide prognostic or predictive signatures. |
| DRFI |
| Distant recurrence-free interval. |
| DMFS |
| Distant metastasis-free survival. |
| BCS |
| Breast-conserving surgery. |
| GEP / GEA / GEC / GC |
| Gene expression profiling / gene expression assay / gene expression classifier / genomic classifier — assays that measure expression of multiple genes to provide prognostic or predictive information. |
| ctDNA / cfDNA |
| Circulating tumor DNA / cell-free DNA detected in plasma used for liquid biopsy molecular profiling. |
| GEC |
| Genomic expression classifier or genomic classifier (test that analyzes gene expression to predict cancer behavior). |
| GPS |
| Genomic Prostate Score (Oncotype DX Prostate), a 17-gene assay to predict adverse pathology and guide risk stratification. |
| EPI |
| ExoDx Prostate IntelliScore, a urine exosome gene expression assay to assess risk of high-grade prostate cancer. |
| Bethesda categories |
| Cytology classification system for thyroid FNA results (e.g., III = AUS/FLUS; IV = FN/SFN; V = Suspicious for malignancy; VI = Malignant). |
| NPV/PPV |
| Negative predictive value / Positive predictive value — test performance metrics influenced by disease prevalence. |
| CGP |
| Comprehensive genomic profiling — broad NGS-based panel to identify genomic alterations and actionable targets. |
| MCD |
| Multi-cancer detection test — assays designed to detect signals from multiple cancer types via biomarkers in body fluids (e.g., cfDNA methylation). |
| TTMV-HPV DNA / ctHPVDNA |
| Circulating tumor DNA or tumor tissue-modified viral HPV DNA measured in plasma for detection or surveillance of HPV-related cancer. |
| MRD |
| Molecular residual disease — low levels of tumor-derived DNA detected after definitive therapy indicating residual disease risk. |
| WGTA |
| Whole genome and transcriptome analysis combining DNA and RNA sequencing for tumor profiling. |
| Liquid biopsy / ctDNA |
| Cell-free DNA testing (circulating tumor DNA) for detection of tumor-derived genomic material in blood; referenced as emerging but with uncertain sensitivity, false-positive rates and predictive value for early-stage disease. |