The following databases provide information on gene variants linked to cancer risk.

Leiden Open Variation Database

This is an open source database that lists variants that labs have provided to the database.


This National Center for Biotechnology Information portal provides information about human disorders and other phenotypes that have a genetic component.

MMR Gene Unclassified Variants Database

This database contains information from functional assays and other type of data to support the interpretation of MMR gene unclassified variants.