Could two first cousins suffer from the same form of cancer and, if so, does that indicate that it is hereditary?

There are several types of carcinoid and related neuroendocrine tumors which are genetically determined and are inherited conditions.  They are quite rare, as a group comprising only 4% of all carcinoids. One type in particular, known as familial carcinoid, is very rare but must be considered when two family members have had carcinoid or other NETs. There is no preventive treatment, but early diagnosis could cure the condition if found in an early stage in an individual. Blood and urine markers should be tested at least once a year and OctreoScan as well as CT scan of the abdomen with IV contrast should be considered.

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