How does cancer arise? How does cellular composition influence tumor malignancy? These questions are profound and challenging to answer, but are crucial to understand the disease and find the right cure. Now, a German-Danish team led by Professor Matthias Mann has developed a ground-breaking technology called ‘Deep Visual Proteomics’. This method provides researchers and clinicians with a protein read-out to understand cancer at single cell-type resolution. The technology was published in the journal Nature Biotechnology and demonstrates its potential in a first application to cancer cells.