Short answer
Genetic counseling after medullary thyroid cancer should do more than repeat the lab result. It should clarify whether RET testing was germline or tumor-only, whether MEN2 is likely, which relatives may need targeted testing, and what follow-up depends on the result. That often includes calcitonin, thyroid imaging, pheochromocytoma screening, and sometimes parathyroid planning.
What counseling should clarify
| Topic | Question | Why it matters |
|---|---|---|
| Sample type | Was RET tested in blood, saliva, buccal swab, or tumor tissue? | Inherited risk and tumor-only findings are not the same thing. |
| Exact variant | What is the exact RET change, including codon and classification? | Variant-specific MEN2 risk changes the follow-up plan. |
| MEN2 pattern | Do thyroid, adrenal, or calcium findings fit MEN2? | MEN2 can involve more than the thyroid. |
| Family follow-up | Which relatives should be offered testing first? | Cascade testing is often the main reason counseling matters. |
When family history changes the plan
Follow-up matters more when family history, pediatric timing, or a known RET variant could change what counseling recommends next. Genetics counseling helps turn the report into a family plan instead of a single clinic question.
When specialist review matters
Specialist review matters when the counseling visit needs to coordinate surgery timing, calcitonin, and family cascade testing rather than only repeat the lab result.
How genetic testing is done
Genetic testing is usually done with blood or saliva, and the lab workflow depends on whether the question is a targeted variant, a panel, or confirmation after a clinical finding. Genetics counseling can help clarify whether the next step is a new test, family testing, or a different clinical workup.
Questions to bring
- Was the RET result from tumor tissue, or was it germline testing from blood or saliva?
- What is the exact codon or variant name, and is it pathogenic, likely pathogenic, VUS, or negative?
- Does the result change calcitonin, thyroid ultrasound, pheochromocytoma screening, or parathyroid follow-up?
- Should children, siblings, or parents get targeted testing for a known familial RET variant?
- Do we need a cancer genetics visit before surgery or before sharing results with relatives?
Before the visit
- Bring the exact pathology report, RET report, and any calcitonin or CEA results.
- Write down family history of medullary thyroid cancer, pheochromocytoma, parathyroid disease, sudden deaths, or known RET variants.
- Note whether any prior testing was tumor-only, paired tumor-normal, or germline.
- Ask how results should be shared with relatives, especially if children are involved.
After the visit
| Result pattern | What it usually means | Next question |
|---|---|---|
| Positive germline RET | Supports MEN2 risk and family cascade testing. | Who needs targeted testing and surveillance? |
| Tumor-only RET finding | May be somatic; inherited risk may still need confirmation. | Was germline follow-up recommended? |
| Negative RET | Lowers inherited MEN2 concern, but does not erase all clinical follow-up. | Does the pathology or family history still suggest another path? |
| RET VUS | Not proof of MEN2 on its own. | How will the lab or genetics team handle reclassification? |
FAQ
Does medullary thyroid cancer always mean MEN2?
No. Medullary thyroid cancer can be sporadic or hereditary, so the RET result and family history are what help sort that out.
Is RET testing done on blood or tumor?
It can be either. Blood or saliva is usually germline testing, while tumor testing looks at the cancer itself and may not answer inherited-risk questions.
Why do calcitonin and pheochromocytoma questions matter?
Calcitonin helps with medullary thyroid cancer follow-up, and MEN2 can also involve adrenal tumors, so the counseling plan should not stop at the thyroid.
Should my relatives be tested too?
If a pathogenic or likely pathogenic familial RET variant is found, targeted family testing is usually the key next step.
What if the RET result is negative?
A negative germline RET result lowers inherited MEN2 concern, but the clinician may still use pathology, calcitonin, imaging, and family history to decide follow-up.
What does a RET VUS mean?
A variant of uncertain significance is not the same as a confirmed MEN2-causing change, so it should not be treated like a positive family variant unless the lab later reclassifies it.