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Genetic and genomic reports — reading the summary page

A genomic (or "genetic") cancer report can run to ten or more pages, but almost every lab structures it the same way: patient and specimen details, the test method used, a results table of the genes or biomarkers checked, and a therapy-association section that flags which findings are "actionable" — meaning linked to an approved drug or open trial. Most of what's listed is background, not a call to action. NCCN and ASCO both recommend a molecular tumour board or oncologist walk patients through the summary page rather than reading a printout alone. This page explains the layout and terminology only — it does not interpret your specific report.

Medically reviewed by Dr. T. Raghavender Reddy, Medical Oncologist, MBBS · DM (Medical Oncology) · MD (Radiation Oncology) · Last reviewed August 2026

  • Five sections, one order — specimen and method first, then a results table, then therapy associations — every report follows roughly this layout
  • Actionable ≠ significant-sounding — a variant can be real and still not "actionable" if no approved drug or trial matches it yet
  • A VUS is not a diagnosis — a "variant of uncertain significance" is a placeholder finding, not evidence of risk
  • A tumour board reads it with you — most centres review a genomic report as a team before discussing it with you
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What are the key sections of a genomic or genetic report?

Almost every lab structures a genomic or genetic report the same way: patient and specimen details, the test method used, a results table listing the genes or biomarkers checked, and a therapy-association section flagging which findings connect to an approved drug or open clinical trial. Reference and limitation notes usually sit at the end. Once you know this order, you can go straight to the section that matters most instead of reading the whole document top to bottom.

  • Patient & specimen information — the sample type, collection date and tumour content the lab used to run the test.
  • Test methodology — which technology was used (commonly next-generation sequencing, or NGS) and how many genes the panel covers.
  • Genes / biomarkers tested — the full panel list, which can run from a handful of genes to several hundred.
  • Results table — every variant or biomarker value detected, usually with a tier or significance label next to each one.
  • Therapy associations & trial matches — the section your oncologist reads most closely, listing any approved drug or open trial linked to a specific finding.

Genomic and genetic testing for CION patients is coordinated through accredited partner laboratories — this page explains the general layout and terminology; it does not interpret your specific report.

Did you know?

A genomic report often lists results for 50, 200 or even 500+ genes on a single panel — but on most reports, only one to three findings end up flagged as genuinely "actionable" for the cancer being treated. A long gene list is not the same as a long list of treatment options.

Reading The Numbers

Common report fields and what their bands mean

These are the value types most often seen on a genomic or genetic summary page. Check which ones appear on your report's methodology and results sections.

Report field Typical bands / categories What it signals
Variant tier (AMP/ASCO/CAP) Tier I (strong significance) · Tier II (potential significance) · Tier III (VUS) · Tier IV (benign/likely benign) Only Tier I and, sometimes, Tier II findings are typically discussed as actionable
Variant Allele Frequency (VAF) Reported as a percentage of sequencing reads carrying the variant Reflects how much of the sampled tissue carries the change — a low VAF alone doesn't mean "unimportant"
Tumour Mutational Burden (TMB) Reported in mutations/megabase; commonly grouped low (<10 mut/Mb) vs high (≥10 mut/Mb) A regulatory cutoff cited by NCCN/FDA labelling for certain immunotherapy eligibility discussions — practice can vary by cancer type and region
Microsatellite Instability (MSI) MSS (stable) · MSI-Low · MSI-High MSI-High is a recognised, tumour-agnostic marker your oncologist may discuss regardless of cancer type

Bands and categories shown are the commonly cited AMP/ASCO/CAP and NCCN reference points used in patient education, indicative as of August 2026. Guidelines are updated periodically, and not every band applies to every cancer type — your oncologist confirms which fields are relevant to your specific report; this table is general education, not an eligibility statement.

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What To Do Next

How should you actually read your report, top to bottom?

A practical order to work through the pages, rather than reading every line with equal weight.

  1. Confirm the sample and test match what was ordered

    Check the specimen type, collection date and the test name against what your oncologist requested — a mismatch here is worth flagging before you read any further.

  2. Go straight to the therapy-association section

    This is usually the shortest section and the one your oncologist reads most closely — it names any approved drug or open trial actually linked to a finding.

  3. Note what's marked "not actionable" or VUS — without alarm

    These entries exist to be complete, not to warn you. A Tier III or Tier IV label does not, on its own, mean something is wrong.

  4. Bring the full report, not a summary, to your next visit

    A molecular tumour board or your oncologist reads the complete document, including methodology and limitations — a partial printout can leave out context that changes what a finding means.

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The Real Distinction

What is actionable vs incidental on a genomic report?

An actionable finding is a genetic change linked to an approved targeted therapy, immunotherapy or an open clinical trial for your specific cancer — it's what your oncologist is scanning the report for. An incidental finding is something detected along the way that isn't relevant to the current treatment decision: a variant in a gene unrelated to your cancer type, or occasionally a finding with implications for family members if it turns out to be inherited (germline).

Most items on a results table are neither — they're simply documented as part of a complete report. A long list of genes tested is not the same as a long list of treatment options, and a report with no actionable findings does not mean the testing "failed"; it means none of the genes checked matched an approved option at this time.

Who's Involved

Who explains a genomic report to a patient?

Reading a genomic report is rarely a one-person job — several roles are typically involved before you hear the summary.

  • Your treating oncologist — usually the first person to walk you through what applies to your case and what doesn't.
  • A molecular tumour board — a panel that reviews the report as a team, discussing which findings are genuinely actionable before your consultation.
  • A genetic counsellor — brought in specifically if a possible inherited (germline) finding is flagged, to explain what it may mean for you and your family.
  • The reporting laboratory's molecular pathologist — the specialist who authored the report and can clarify technical questions your oncologist refers back to them.
Related Reading

Understanding the wider biomarker picture

This page explains general genomic and genetic report terminology and layout for education only, and does not interpret any individual patient's report or confirm treatment eligibility. Genomic and genetic testing for CION patients is coordinated through accredited partner laboratories. Bring your full report to a consultation for a doctor's explanation of what it means for you.

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Thousands of families have made sense of a genomic report with us

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Common questions

Reading a genomic or genetic cancer report: your questions answered

What are the key sections of a genomic or genetic cancer report?
Almost every lab structures a genomic or genetic report the same way: patient and specimen details, the test method used (such as next-generation sequencing panel size), a results table listing the genes or biomarkers checked, and a therapy-association section flagging which findings connect to an approved drug or open clinical trial. Reference and limitation notes usually appear at the end. Knowing this order helps you find the part that matters most — the therapy-association section — instead of getting lost in the raw gene list.
What is the difference between an actionable finding and an incidental finding?
An actionable finding is a genetic change linked to an approved targeted therapy, immunotherapy, or an open clinical trial for that specific cancer — it is what your oncologist is looking for. An incidental finding is something detected along the way that isn't relevant to your current treatment decision, such as a variant in a gene unrelated to your cancer type, or occasionally a finding with implications for family members (germline). Most items listed on a report are background information, not actionable — a long gene list does not mean many treatment options exist.
Who explains a genomic report to a patient?
Your treating oncologist is usually the first person to walk you through the summary page, often after the report has been reviewed by a molecular tumour board — a panel of specialists who discuss which findings, if any, are actionable for your case. If the report flags a possible inherited (germline) finding, a genetic counsellor may also be involved. NCCN and ASCO both recommend this kind of team review rather than a patient interpreting a genomic printout alone.
What does "variant of uncertain significance (VUS)" mean?
A variant of uncertain significance (VUS) is a genetic change that current scientific evidence cannot yet classify as clearly harmful or clearly harmless. Under the AMP/ASCO/CAP four-tier system most labs use, a VUS sits in Tier III, below Tier I (strong clinical significance) and Tier II (potential clinical significance). A VUS on its own is not a diagnosis and does not usually change a treatment plan — some VUS findings are reclassified as more evidence emerges over time.
Should I read my genomic report before my oncologist appointment?
You're welcome to look through it, but treat it as context rather than a conclusion. Genomic reports use dense terminology and tier labels that are easy to misread without training, and a finding that looks alarming in isolation is often a Tier III or Tier IV result with no bearing on your treatment. Bring your questions and the full report to your oncologist rather than trying to self-diagnose actionability from the printout alone.
Does a genomic report guarantee that a specific treatment will work for me?
No. A genomic report can identify a biomarker that makes a targeted therapy, immunotherapy or clinical trial an option worth discussing, but it does not guarantee a response — response rates for biomarker-matched treatments are described by NCCN, ASCO and ESMO as a proportion of patients, never a certainty for any individual. Genomic and genetic testing for CION patients is coordinated through accredited partner laboratories; this page explains general report layout and terminology only and does not interpret any individual patient's results or confirm eligibility for a specific treatment.
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