Dear R. Jayashree ,

Consider the body and its organs as a relative topological space generated by the usual metric Euclidean space RXR3.={(t,x,y,z), t,x,y,z in R , t is the time and (x,y,z) the location of the cell in the body}. Now you can consider open neighborhoods as open balls. I suggest to consider the cancer cells as sequences to be defined according to some (model) and their behavior represents the unusual growth of the random cells. This may simulate the real case. Just try it.

Best regards