The construction and development of urban areas is a relatively recent phenomenon. Urbanisation does, however, impose a range of advantages and disadvantages for biological organisms and which can bring them into conflict with humans.
Cancer is an evolutionary process. Cells in a tumour vary due to mutation, and so over many generations they adapt in response to both intrinsic selective pressures (such as anoxia) and extrinsic selective pressures (such as chemotherapy).
We are interested in the spread of cancer, a process called metastasis. Metastasis is responsible for the majority of cancer deaths and there are currently no effective treatments to stop this process.