You're right. Cutaneous T-Cell lymphoma or blood cancers in general are not contagious. Up to 10 percent of all cancer cases are traced to gene mutations and inherited cancer syndromes passed down through generations. Researchers are studying the genetic predisposition of some blood cancers.

Here are a couple of studies explaining more:
- Study Identifies Familial Risk Patterns of Several Hematologic Malignancies https://ashpublications.org/ashclinicalnews/news/4753/Study-Identifies-Familial-Risk-Patterns-of-Several
- Genetic and epigenetic insights into cutaneous T-cell lymphoma https://ashpublications.org/blood/article/139/1/15/477053/Genetic-and-epigenetic-insights-into-cutaneous-T
- Mayo Clinic study finds 1 in 8 patients with cancer harbor inherited genetic mutations https://newsnetwork.mayoclinic.org/discussion/mayo-clinic-study-finds-1-in-8-patients-with-cancer-harbor-inherited-genetic-mutations/

For some cancer types, knowing if you have a genetic mutation can help determine the most effective treatment.

Have you ever spoken with a genetic counselor to learn more about genetics and cancer?