Familial neuroendocrine tumor syndromes: from genetics to clinical practice.

Thanks to recent developments in molecular biology and cancer genetics, genetic testing has become widely available and useful in several kinds of familial tumor syndrome. However, the impact of genetic testing on medical management is not always straightforward. Clinicians have to consider the psychological impact and ethical complexities of communicating hereditary cancer risk information to families. This review notes some points on genetic counseling before and after genetic testing for familial neuroendocrine tumor syndromes.