The emerging field of single-cell genomics is advancing rapidly and is generating many new insights into complex biological systems, like the human brain, immune system and tumors. Genomic profiling in single cells will have a big impact on clinical applications in the coming years. For example, resected tumors might be routinely assessed for the presence of rare malignant and chemo-resistant cancer cells. Such data will provide crucial diagnostic information and will guide decisions regarding treatment. Tissue biopsies containing only a small number of cells, for example from gut mucosal surfaces, can be interrogated by single-cell profiling technologies providing molecular data that informs on diagnosis, disease progression, and appropriate treatment. Furthermore, immune-repertoire profiling will provide detailed information on the response of immune cells, which will inform diagnoses and the choice of therapy. In order to partake in this promising field a strong technology platform is required to support biomedical and clinical researchers in setting up robust experimental and analytical pipelines for data generation and interpretation.