Very rare: Having 4 primary cancers same time is very rare , it is possible to have 4 cancers in different times in the life cycle.
Answered 10/24/2017
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Very unusual: It is very unusual to have 4 different cancers at one time. However, there are certain rare genetic syndromes where a patient may have more than one tumor (benign or cancerous) at a time. Some examples of such syndromes: multiple endocrine neoplasia (mens), li-fraumeni, turcot's, von-hippel lindau.
Answered 10/4/2016
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