An article published in Science (Science 365, 464; http://dx.doi.org/10.1126/science.aau9923 by Baez-Ortega and colleagues, including Conceição Peleteiro of FMV/CIISA Pathology Lab, traced the evolution of a transmissible cancer over several thousand years. A combination of highly elaborated molecular and bioinformatics techniques using samples collected worldwide suggest that neutral genetic drift is the dominant evolutionary force operating on cancer over the long term. This research was also highlighted in the national press in particular in the Publico edition of August the 2nd
https://www.publico.pt/2019/08/02/ciencia/noticia/afinal-comecou-cancro-transmissivel-caes-1881732.