Genetics of Appendix Cancer Study

Inclusion Criteria: GAP Social * Known diagnosis of appendix cancer in the United States * Mentally and physically able to consent and participate in the study GAP Vanderbilt * Known diagnosis of appendix cancer * Diagnosed by and/or consulting with a physician/clinical provider participating in the GAP Study * Mentally and physically able to consent and participate in the study GAP Parent * Biological parents (mother and/or father) of individuals actively participating in the GAP Study * Residing in the United States * Mentally and physically able to consent and participate in the study Exclusion Criteria: * Women pregnant at the time of consent * Prisoners * Unable to provide informed consent * Unable to read, write, or complete questionnaires in English