Although relatively rare, compared with cancer in adults, cancer is more common in TYA than in children.
Cancer statistics for adults are generally classified according to the site of the tumour in the body, such as lung, bowel, breast. TYA cancers, however, are more appropriately classified using a system that also takes into account the type of cell and tissue from which the cancer originates. This system is similar, but not identical, to the system used for the classification of childhood tumours.
- Lymphoma is the most common cancer in this age group, accounting for more than 20% of cases. Next most common is carcinoma (of the thyroid, cervix, ovary, bowel or breast)
- Although making up a smaller proportion of cases overall, the incidence rate of CNS tumours is the same in childhood and TYA
- Germ cell tumours become much more common, with the majority of cases being testicular
- Bone tumours are more than twice as common in TYA as in childhood.