Inclusion criteria:  Major or minor subject having undergone genetic research for primary hyperoxaluria between 01/01/2015 and 31/12/2019 Major subject not having expressed, after information, the reuse of his data for the purposes of this research Child and holders of parental authority who have not expressed, after information, the reuse of their data for the purposes of this research  Exclusion criteria:  Subject (or his parental authority if he is a minor) who has expressed his opposition to participating in the study Subject not residing in France Subject of foreign nationality Subject under tutorship or curatorship Subject under safeguard of justice