You should start your search from finding donor agencies working on addressing cancer-related or health-related issues. Because of the specificity of the ostomates, you will not find international funders exclusively providing funds to address this cause. However, there are several cancer-fighting foundations providing resources. We compile any upcoming grants related to cancer at https://www2.fundsforngos.org/tag/cancer/. You can view listed grant opportunities here and also bookmark it to learn about new ones.