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Objective: We summarized the relationship between the descent of a testicle into the scrotum and testicular cancer. Methods: Twenty-eight patients with testicular cancer after surgical treatment of cryptorchidism were retrospective analysis. Results:All patients were performed surgical treatment of cryptorchidism from 2 to 28 years old (median, 12 years;average, 16 years). Testicular cancer age ranged from 19 to 53 years (median, 33 years; average, 36 years). Malignant transformation occurred from 3 to 25 years of operation time (average, 18 years). Twenty-seven cases of malignant cryptorchidism ipsilateral, contralateral malignancy in 1 case, 27 cases were underwent radical resection of testicular cancer. Pathology diagnosis was mainly seminoma. Retroperitoneal lymph node dissection was done in 3 cases, 18 cases were chemotherapy and radiotherapy in 3 cases. Conclusion: The undescended testicle is the most common genital malformation in boys. When diagnosed, it should be treated as early as possible, but successful treatment appears not to lessen the risk of testicular cancer, patients must be closely monitored follow-up.