Invasive index with different tension coefficients ηCD and ηDD. Invasive index decreases when ηCD increases despite of the value of ηDD (black line for visual representation). When ηCD = 0.5, tumor is most invasive, indicating that increased adhesion to ECM cells and decreased adhesion to tumor cells result in invasive tumor behavior. Invasive index responds to ηDD differently dependent on the value of ηCD. When ηCD = 0.5, invasive index increases with ηDD significantly. When ηCD = 1.0, invasive index increases with ηDD slightly. When ηCD = 1.5, invasive index is not influenced by with ηDD.