“…Due to the complexity of the tumour microenvironment, which makes it difficult to understand the interactions between the different components of this environment, mathematical models have been used over the last few decades to answer various questions about these interactions. The great majority of these models are single-scale models, which focus on spatial tumour invasion [5,16,12], on tumour oncolytic therapies [11,14,13,17,21,28,42], or both [6,24,27,38,43]. More recently, various multi-scale mathematical models have been derived to reproduce and investigate biological processes that take place at different spatial scales [1,2,3,4,30,31,39,36].…”