RESUMEN
Previous reports noted a high proportion of young Jordanian breast cancer [BC] patients. This study was performed to find whether this is reproducible and to examine the role, if any, of a young population structure in causing this. We hypothesized that the age distribution [AD] of BC in Jordan is independent from the population structure. By finding that the AD of BC in a model population, where the population structure of Jordan is similar to the USA, was significantly different [P = 0.01] from the observed AD in Jordan, we rejected this hypothesis. We conclude that a young population structure, as well as a low incidence in older patients, are the main reasone behind a high proportion of young patients with BC in Jordan. This may also be valid in other countries having an early onset/low incidence rate of BC