POLE gene

Associated Syndrome Name: Polymerase Proofreading-associated Polyposis (PPAP)

POLE Summary Cancer Risk Table

Cancer Genetic Cancer Risk
ColorectalHigh Risk

POLE gene Overview

Polymerase Proofreading-associated Polyposis (PPAP) 1, 2, 3, 4
  • POLE mutations have been found in individuals with early onset colorectal cancer, large numbers of adenomatous colorectal polyps, and/or significant family histories of colorectal cancer. Although there are as yet no precise estimates of the colorectal cancer risk associated with mutations in POLE, it is believed that the risk is significantly increased over that in the general population.
  • Individuals with POLE mutations are often found to have small bowel and gastric fundic gland adenomas.
  • Some families with POLE mutations include individuals with a wide range of cancers. In particular, there are reports of an increased risk for brain tumors (glioblastomas and astrocytomas) in individuals with mutations in POLE. Further studies are needed to determine if these (or any other cancers) are conclusively associated with POLE gene mutations.
  • Although there is an increased risk for colorectal cancer in individuals with PPAP due to mutations in POLE, it may be possible to reduce this risk with appropriate medical management. Guidelines for the medical management of patients with PPAP have been developed by the National Comprehensive Cancer Network (NCCN). These are listed below. These guidelines will evolve as we learn more about PPAP, and it is recommended that patients with a POLE mutation and a diagnosis of PPAP be managed by a multidisciplinary team with expertise in medical genetics and the care of patients with hereditary cancer syndromes.

POLE gene Cancer Risk Table

Cancer Type Age Range Cancer Risk Risk for General Population
ColorectalTo age 802, 3, 4, 5High risk2.8%

POLE Cancer Risk Management Table

The overview of medical management options provided is a summary of professional society guidelines. The most recent version of each guideline should be consulted for more detailed and up-to-date information before developing a treatment plan for a particular patient.

This overview is provided for informational purposes only and does not constitute a recommendation. While the medical society guidelines summarized herein provide important and useful information, medical management decisions for any particular patient should be made in consultation between that patient and his or her healthcare provider and may differ from society guidelines based on a complete understanding of the patient’s personal medical history, surgeries and other treatments.

Cancer Type Procedure Age to Begin Frequency
(Unless otherwise indicated by findings)
ColorectalColonoscopy225 to 30 yearsEvery 2 to 3 years
Colorectal surgical evaluation and counseling.2, 6Based on cancer diagnosis and/or polyp number, size and histologyNA

Information for Family Members

The following information for Family Members will appear as part of the MMT for a patient found to have a mutation in the POLE gene.

This patient's relatives are at risk for carrying the same mutation(s) and associated cancer risks as this patient. Cancer risks for females and males who have this/these mutation(s) are provided below.

Family members should talk to a healthcare provider about genetic testing. Close relatives such as parents, children, brothers and sisters have the highest chance of having the same mutation(s) as this patient. Other more distant relatives such as cousins, aunts, uncles, and grandparents also have a chance of carrying the same mutation(s). Testing of at-risk relatives can identify those family members with the same mutation(s) who may benefit from surveillance and early intervention.

References

  1. Buchanan DD, et al. Risk of colorectal cancer for carriers of a germ-line mutation in POLE or POLD1. Genet Med. 2018 20:890-895. Erratum in: Genet Med. 2018 Feb 01. PMID: 29120461.
  2. Gupta S, et al. NCCN Clinical Practice Guidelines in Oncology® Genetic/Familial High-Risk Assessment: Colorectal. V 1.2021. May 11. Available at https://www.nccn.org.
  3. Bellido F, et al. POLE and POLD1 mutations in 529 kindred with familial colorectal cancer and/or polyposis: review of reported cases and recommendations for genetic testing and surveillance. Genet Med. 2015 18:325-332. PMID: 26133394.
  4. Palles C, et al. Germline mutations affecting the proofreading domains of POLE and POLD1 predispose to colorectal adenomas and carcinomas. Nat Genet. 2013 45:136-44. PMID: 23263490.
  5. SEER*Explorer: An interactive website for SEER cancer statistics [Internet]. Surveillance Research Program, National Cancer Institute. [Cited 2020 Sep 14]. Available from https://seer.cancer.gov/explorer/.
  6. Achatz MI, et al. Cancer Screening Recommendations and Clinical Management of Inherited Gastrointestinal Cancer Syndromes in Childhood. Clin Cancer Res. 2017 23:e107-e114. PMID: 28674119.
Last Updated on 21-Apr-2022