TABLE 2.

Summary of the age of MB and PA cases with expression of ERBB4 JM-c or JM-d variants

Tumor type	Group of cases*	Median age at operation (yrs)	Range of age at operation (yrs)	No. of cases	No. of cases expressing JM-c	No. of cases expressing JM-d
MB	Children	7	0.6 - 15	23	6 (26%)	15 (65%)
	Adults	22	18 - 41	8	5 (63%)	5 (63%)
PA	Children	6	0.5 - 14	26	11 (42%)	0
	Adults	24	17 - 33	9	6 (67%)	0

^*A cut-off age of 15 years was used to divide the cases into childhood and adult groups because this age is used by the American Cancer Society (www.cancer.org) and the United Kingdom Office for National Statistics (www.statistics.gov.uk) to define childhood cancer incidence.