Dynamic response of cancer under the influence of immunological activity and therapy

The accompanying letter by H. Ortega addresses some points with respect to our previous article (de Vladar and González, 2004). He begins addressing some arguments about our interpretations of the parameters that are hand-waving rather than scientific. However, he is mostly concerned with the asymptotic behaviour of the tumour-immunity system when therapy is present. Dr. Ortega repeats calculations of our system where he either (i) reaches the same conclusions as we do or (ii) reaches different but mistaken conclusions. In any case, he intends to pose destructive critiques to our paper without providing a real contribution to the field, much less an enrichment to our model.