Table.

Occurrence of testicular neoplasia in 830 men who had testicular biopsy samples taken at time of surgical treatment for cryptorchidism

Case No	Age at operation for cryptorchidism (years)	Record of testicular neoplasia	Included in analysis of 830 men*	Included in analysis of 1026 testes†	Diagnosed at time of surgery for cryptorchidism
1	14.3 (right)	Yolk sac tumour in normally descended left testis at 1.8 years.	No	No	No
2	18.6 (left and right)	Seminoma in right testis at 18.6 years.	No	No	Yes
3	15.4 (right)	Carcinoma in situ in right testis at 15.4 years.	No	No	Yes
4	10.8 (left);	Carcinoma in situ in right testis at 10.9 years.	No	No	Yes
	10.9 (right)
5	13.6 (left and right)	Non-seminoma in left testis at 27.5 years.	Yes	Yes	No
6	11.3 (right)	Non-seminoma in normally descended left testis at 24.1 years.	Yes	No	No
7	14.8 (left and right)	Seminoma in right testis at 36.2 years.	Yes	Yes	No

^*Follow up of 830 men: 12 777 person years; observed/expected=3/1.47, relative risk=2.0 (95% confidence interval 0.4 to 6.0). 

^†Follow up of 1026 biopsied testes: 15 762 testis years; observed/expected=2/0.92, relative risk=2.2 (0.3 to 7.9).