A family history of cancer raises real questions: Am I at risk? Should my children be worried? What can I do about it? For 5–10% of people with cancer in their family, the answer lies in a gene mutation inherited through generations — one that can be identified with a blood test and managed proactively.
This guide explains what hereditary cancer means, which genes are involved (BRCA1 and BRCA2, but also several others), who should consider testing, and — critically — what you can actually do with a positive result in India today.
Is Cancer in My Family Hereditary?
Most cancers — roughly 90% — are sporadic: they develop from a combination of ageing, environmental exposures, and chance. Having a relative with cancer does not automatically mean your family carries a hereditary cancer gene mutation.
However, certain patterns in a family history raise the probability that an inherited gene mutation is involved:
A single cancer in a family does not automatically mean hereditary risk. A genetic counselor uses your complete family history — across at least three generations, on both sides — to calculate your actual probability of carrying a hereditary cancer gene mutation. This assessment comes before any testing decision.
BRCA1 & BRCA2 — What They Do, and What Mutations Mean
The BRCA1 and BRCA2 genes are tumour suppressor genes — they normally help repair damaged DNA and prevent cells from growing out of control. When one copy of these genes carries a mutation, that repair function is compromised, significantly raising the lifetime risk of certain cancers.
These are lifetime risks — not a certainty. Many BRCA carriers never develop cancer. The figures represent the cumulative probability across a lifetime without risk-reduction interventions. With appropriate surveillance and preventive measures (discussed below), this risk can be dramatically reduced.
BRCA mutations also affect men. Male BRCA2 carriers have approximately a 7% lifetime breast cancer risk (versus 0.1% in the general male population), and significantly elevated prostate and pancreatic cancer risks. Male BRCA1 carriers have elevated prostate cancer risk. Testing is relevant for men in BRCA families too.
Beyond BRCA — Other Hereditary Cancer Genes
BRCA1 and BRCA2 are the most well-known, but hereditary cancer genetics extends well beyond them. Depending on your family history, other genes may be equally or more relevant:
| Gene / Syndrome | Primary Cancer Risks | Who Should Consider Testing |
|---|---|---|
| PALB2 | Breast cancer risk approaching BRCA2 levels (~53% lifetime); elevated pancreatic risk | Families with breast cancer history who test BRCA-negative |
| CHEK2 | Moderate breast cancer risk (20–30% lifetime); elevated colorectal risk | Families with breast or colorectal cancer, especially with BRCA-negative results |
| ATM | Moderate breast cancer risk; elevated pancreatic cancer risk | Families with multiple breast cancers or pancreatic cancer history |
| Lynch Syndrome (MLH1, MSH2, MSH6, PMS2, EPCAM) | Colorectal cancer (40–80% lifetime), uterine cancer (25–60%), ovarian, stomach, urinary tract | Colorectal cancer before age 50; uterine cancer at any age; multiple Lynch-associated cancers in family |
| CDH1 | Hereditary diffuse gastric cancer (80% lifetime); lobular breast cancer | Families with diffuse (signet ring cell) stomach cancer, especially at young age |
| STK11 (Peutz-Jeghers) | Gastrointestinal, breast, pancreatic, cervical cancers | Individuals with characteristic polyps and mucocutaneous pigmentation |
| VHL, SDHB/C/D | Renal cell carcinoma, pheochromocytoma, paraganglioma | Families with kidney cancer, especially bilateral or early-onset; adrenal tumours |
This is why modern hereditary cancer testing typically uses a multi-gene panel rather than testing BRCA alone. A genetic counselor helps you determine which panel is appropriate based on your personal and family history — avoiding unnecessary testing while ensuring relevant genes are covered.
Who Should Consider Hereditary Cancer Genetic Testing?
Testing is most useful when the probability of finding a meaningful result is sufficiently high to justify the cost and the emotional weight of learning the result. A genetic counselor uses validated risk models to estimate this probability. In general, testing is appropriate for individuals with:
If a family member has already had cancer, testing the affected individual first is almost always more informative. Finding a mutation in an affected person allows unaffected relatives to get a targeted, conclusive test — rather than a panel test that may return uncertain results.
What the Genetic Test Involves
Hereditary cancer genetic testing requires a simple blood draw — typically 3–5 ml. The sample is sent to a molecular genetics laboratory, where the relevant genes are sequenced. Results are typically available in 3–6 weeks depending on the laboratory and panel size.
Types of Results
- Positive (Pathogenic / Likely Pathogenic variant) — A disease-causing mutation was identified. This confirms hereditary cancer risk and informs medical management.
- Negative — No mutation was found in the genes tested. Importantly, this does not mean zero risk — it means no hereditary gene mutation was identified with current technology.
- Variant of Uncertain Significance (VUS) — A change was found in a gene, but it is not yet known whether this change causes cancer. VUS results require follow-up and should be interpreted only with a genetic counselor.
Do not order genetic tests directly online without counseling. A Variant of Uncertain Significance (VUS) misinterpreted as a positive result has led people to undergo unnecessary surgery. Conversely, a negative result misread as "no risk" has led to false reassurance. Results must be interpreted in the context of your full family history by a trained genetic counselor.
What a Positive BRCA or Hereditary Cancer Result Means
A positive result is not a cancer diagnosis. It means you carry an inherited gene mutation that significantly raises your lifetime risk of certain cancers. The risk is real — but it is also manageable. Most BRCA carriers who are identified and monitored appropriately do not die from BRCA-related cancers.
A positive result has implications for:
- You — your surveillance plan, preventive options, and (if you have cancer) your treatment choices
- Your blood relatives — parents, siblings, and children each have a 50% chance of carrying the same mutation and should be offered testing
- Family planning — couples who both carry hereditary cancer gene mutations (or where one partner is a carrier) may consider preimplantation genetic testing to avoid passing the mutation to children
Your Options After a Positive Result
Hereditary Cancer Genetic Testing in India — The Current Reality
Awareness of hereditary cancer genetics in India is growing, but significant gaps remain. Many oncologists and gynaecologists do not routinely refer patients with early-onset or familial cancers for genetic counseling. Families frequently learn about BRCA mutations only after a second or third cancer diagnosis — losing the opportunity for earlier intervention.
On the positive side, multi-gene panel testing is now available through several NABL-accredited diagnostic laboratories in India at costs that have dropped substantially in recent years. Genetic counseling (pre-test and post-test) is available in person in Ahmedabad and virtually across India.
A Note on Cascade Testing
Once a hereditary cancer mutation is identified in one family member, testing other at-risk relatives becomes both simpler and less expensive — they only need a targeted single-gene test for the specific mutation already found, rather than a full panel. This targeted test typically costs significantly less. The biggest barrier in Indian families is often the conversation — letting relatives know that a hereditary cancer mutation has been found and that testing is available to them. A genetic counselor can assist with how to communicate this to family members.
If you or a close relative has already had cancer: your oncologist's treatment decisions may also be affected by a hereditary gene result. BRCA-positive breast and ovarian cancers respond to PARP inhibitor therapy. This is another reason to pursue genetic testing sooner rather than later after a cancer diagnosis — not just for family planning.
Frequently Asked Questions
Not necessarily. Most breast cancers (85–90%) are sporadic — they occur by chance, not due to an inherited gene mutation. However, your family history does raise your personal risk. A genetic counselor can review your full family history, calculate your probability of carrying a BRCA or other hereditary cancer gene mutation, and advise whether testing is recommended. Having one affected relative is not sufficient on its own — the age at diagnosis, number of affected relatives, and specific cancer types all matter.
No. A negative BRCA test means you don't carry the specific BRCA1 or BRCA2 mutations tested. It does not eliminate your cancer risk entirely — 85–90% of breast and ovarian cancers are not caused by BRCA mutations. Other hereditary cancer genes (PALB2, CHEK2, ATM, Lynch syndrome genes) may still be relevant. A genetic counselor will review whether a broader panel test is warranted based on your family history, even after a negative BRCA result.
BRCA mutations follow an autosomal dominant inheritance pattern — each child of a BRCA carrier has a 50% chance of inheriting the same mutation. A positive result in a parent is a signal for adult children (18+) to consider testing as well. Children who inherit the mutation can then begin appropriate surveillance from the recommended age — typically from their late 20s or early 30s for BRCA1, depending on the family history. Testing minors for adult-onset hereditary cancer conditions is generally not recommended unless there is an actionable intervention in childhood.
Yes — and this is important. A positive hereditary cancer gene result after a breast cancer diagnosis can influence your surgical decisions (e.g., contralateral mastectomy), your surveillance for ovarian cancer, and your choice of systemic treatment (PARP inhibitors work specifically in BRCA-positive cancers). It also has implications for your blood relatives, who may want to test and begin surveillance or prevention.
Lynch syndrome (also called Hereditary Non-Polyposis Colorectal Cancer or HNPCC) is caused by mutations in the MLH1, MSH2, MSH6, PMS2, or EPCAM genes. It primarily raises the risk of colorectal and uterine (endometrial) cancer, with lifetime risks of 40–80% for colorectal cancer. Unlike BRCA, which mainly affects breast and ovarian cancer risk, Lynch syndrome affects the digestive and reproductive tracts. Genetic counseling is recommended if you or a close relative has had colorectal cancer before age 50, uterine cancer, or multiple Lynch-associated cancers.
A genetic counseling session at MyGeneScreen Clinic is ₹1,500. This covers a full review of your personal and family history, assessment of your hereditary cancer risk, a recommendation on whether and what to test, and interpretation of results once they are available. The genetic test itself (ordered through a diagnostic lab) is a separate cost — multi-gene panel testing in India typically ranges from ₹15,000 to ₹35,000 depending on the panel size. Targeted single-gene testing (when a family mutation is already known) is considerably less expensive.
Hereditary Cancer Genetic Counseling in Ahmedabad & Online
If cancer has affected multiple members of your family — particularly at a young age, or in a pattern that looks hereditary — a genetic counseling session is the right first step. We review your family history, assess your risk, and guide you on whether testing is appropriate and which genes to test.
Book Hereditary Cancer Counseling — ₹1,500