To estimate the prevalence of any disease, 3 parameters are needed: (1) population structure dynamics, (2) age- and sex-specific incidence rates, and (3) year-specific relative survival (depicted in the top 2 rows). The bottom 2 rows show the population, incidence, and prevalence of CML and the expected number of cases. It is estimated that, by the year 2030, there will be >150 000 patients with CML in India. (Estimates are provided by Marc Delord, Université Paris 7, Institut Universitaire d'Hématologie, Hôpital Saint-Louis, Paris, France.)