was kostet ein gentest für krebs — what are common causes?

The cost of a genetic test for cancer varies widely. Direct-to-consumer (DTC) tests like 23andMe or MyBody-X typically cost €100–300 but only analyze a few risk variants (e.g., partial BRCA1/2) and are not diagnostic. Clinical whole-genome or panel tests for hereditary cancer risk can range from €500 to over €5,000 and require a physician's order. Common causes of cancer are mostly non-genetic: tobacco, UV radiation, diet, obesity, viruses (HPV, hepatitis), and chronic inflammation. Only about 5–10% of cancers are due to strong inherited mutations. The provided context does not address cost or general cancer causes, so this answer is based on general medical knowledge. Caveat: consumer DNA tests may give false reassurance or unnecessary worry; if you have a family history, seek genetic counseling.