CDH1 variants leading to gastric cancer risk management decision-making experiences in emerging adults: 'I am not ready yet'

Pathogenic/likely pathogenic variants (PLPV) in CDH1 are associated with a significantly increased lifetime risk for diffuse gastric cancer, with an average age of onset of 47 years. CDH1 PLPV carriers are recommended to have prophylactic total gastrectomy (PTG) or routine endoscopy surveillance. Emerging adults (EAs) may have unique circumstances that affect their medical management decision-making about PTG versus endoscopy. The study aim was to use qualitative interpretative phenomenological analysis method to understand the lived experience and medical management decision-making process for EAs carrying a CDH1 PLPV. Eligible participants were unaffected CDH1 PLPV carriers, ages 18 to 29, who had not undergone PTG and had discussed CDH1 medical management with a health provider. Semi-structured telephone interviews were transcribed verbatim and analyzed for major themes. Results show EAs wanted to avoid developing diffuse gastric cancer, but most do not feel they are ready for PTG. They had worries about PTG related to their identity exploration, financial stability, and careers. Most did not want to pass the PLPV to their children; however, the cost of preimplantation genetic testing with in vitro fertilization was a concern. Family medical history and self-understanding of endoscopy and PTG highly influenced medical management decision-making. Understanding of diffuse gastric cancer detection rate using endoscopy was inconsistent among participants. Body image was not a concern for most, but they worry about dietary restrictions after PTG. Lastly, connection to peers having the same experience was important. These findings increase our understanding of the medical management decision-making challenges for EA CDH1 carriers. EAs may take an extended time to decide what option is right for them. Thus, genetic counseling for CDH1 PLPV EA carriers requires long-term support and education.