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Five out of 30 families with PCG (16.7%) had disease attributable to CYP1B1 alterations suggesting that CYP1B1 is not the major gene causing PCG in Vietnamese unlike in the case of Arab or Romany patients. This percentage is similar to that detected in studies of Japanese and Chinese patients with sporadic PCG. PCG has proven to be an ocular disease of genetic heterogeneity, calling for further studies to identify novel genes causing this disease.

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