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Cryptorchidism concordance in monozygotic and dizygotic twin brothers, full brothers, and half-brothers.

Abstract：

OBJECTIVE:To study concordance rates of cryptorchidism (undescended testis) in pairs of boys with varying family structure, to evaluate the risk contribution from the intrauterine environment and genetic factors. DESIGN:Population based study of 1,024,500 Danish boys born from January 1, 1973 to December 31, 2004. Classic twin method and computerized square dance design. SETTING:Hospitals and outpatient clinics. PATIENT(S):Six groups of boy pairs: boys with no relation, paternal half-brothers, maternal half-brothers, full brothers, dizygotic twin brothers, and monozygotic twin brothers. INTERVENTION(S):Observational study. MAIN OUTCOME MEASURE(S):Status on each individual regarding cryptorchidism and orchiopexy from the Danish National Patient Register. RESULT(S):Concordance rates of cryptorchidism in the groups were as follows: boys with no relation 3.2% (95% confidence interval 2.7%-3.6%), paternal half-brothers 3.4% (2.3%-4.7%), maternal half-brothers 6.0% (4.5%-7.7%), full brothers 8.8% (8.3%-9.8%), dizygotic twin brothers 24.1% (16.0%-33.6%), and monozygotic twin brothers 27.3% (15.5%-41.2%). CONCLUSION(S):The concordance rate was higher in maternal than in paternal half-brothers, and much higher but of equal magnitude in both twin groups. The findings strongly support that the intrauterine environment and maternal inheritance are contributing to the occurrence of cryptorchidism.

journal_name

Fertil Steril

journal_title

Fertility and sterility

authors

Jensen MS,Toft G,Thulstrup AM,Henriksen TB,Olsen J,Christensen K,Bonde JP

doi

10.1016/j.fertnstert.2008.09.041

subject

Has Abstract

pub_date

2010-01-01 00:00:00

pages

124-9

issue

1

eissn

0015-0282

issn

1556-5653

pii

S0015-0282(08)03939-3

journal_volume

93

pub_type

杂志文章

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