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Cancer Health Center

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Cancer Genetics Risk Assessment and Counseling (PDQ®): Genetics - Health Professional Information [NCI] - Introduction

Many of the medical and scientific terms used in this summary are found in the NCI Dictionary of Genetics Terms. When a linked term is clicked, the definition will appear in a separate window.

This summary describes current approaches to assessing and counseling people about their chance of having an inherited susceptibility to cancer. Genetic counseling is defined by the National Society of Genetic Counselors as the process of helping people understand and adapt to the medical, psychological, and familial implications of genetic contributions to disease. Several reviews present overviews of the cancer risk assessment, counseling, and genetic testing process.[1,2,3,4]

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General Information About Small Intestine Cancer

Incidence and Mortality Estimated new cases and deaths from small intestine cancer in the United States in 2014:[1] New cases: 9,160. Deaths: 1,210. Adenocarcinoma, lymphoma, sarcoma, and carcinoid tumors account for the majority of small intestine malignancies, which, as a whole, account for only 1% to 2% of all gastrointestinal malignancies.[2,3,4,5] Follow-up and Survivorship As in other gastrointestinal malignancies, the predominant modality of treatment is surgery when...

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Individuals are considered to be candidates for cancer risk assessment if they have a personal and/or family history (maternal or paternal lineage) with features suggestive of hereditary cancer.[5] These features vary by type of cancer and specific hereditary syndrome. Criteria have been published to help identify families who may benefit from a referral to genetic counseling.[2,6] The PDQ cancer genetics information summaries on breast, ovarian, colorectal, prostate, and skin cancers and endocrine and neuroendocrine neoplasias describe the clinical features of hereditary syndromes associated with these conditions.

The following are features that suggest hereditary cancer:

  • Unusually early age of cancer onset (e.g., premenopausal breast cancer).
  • Multiple primary cancers in a single individual (e.g., colorectal and endometrial cancer).
  • Bilateral cancer in paired organs or multifocal disease (e.g., bilateral breast cancer or multifocal renal cancer).
  • Clustering of the same type of cancer in close relatives (e.g., mother, daughter, and sisters with breast cancer).
  • Cancers occurring in multiple generations of a family (i.e., autosomal dominant inheritance).
  • Occurrence of rare tumors (e.g., retinoblastoma, adrenocortical carcinoma, granulosa cell tumor of the ovary, ocular melanoma, or duodenal cancer).
  • Unusual presentation of cancer (e.g., male breast cancer).
  • Uncommon tumor histology (e.g., medullary thyroid carcinoma).
  • Rare cancers associated with birth defects (e.g., Wilms tumor and genitourinary abnormalities).
  • Geographic or ethnic populations known to be at high risk of hereditary cancers. Genetic testing candidates may be identified based solely on ethnicity when a strong founder effect is present in a given population (e.g., Ashkenazi heritage and BRCA1/BRCA2mutations).[7,8]
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