Progression

A tumour that progresses typically shows increased growth speed and is more invasive (leading to metastasisMetastasis A tumour that spreads by building new, secondary tumour in other organs than the one affected by the primary tumour. This spreading typically happens through cancer cells that detach from the tumour and are being transported through the blood or lymphatic system.). This can be as the cancer cells mutate and change in a way that makes them less susceptible to the cancer therapy.