The purpose of this study is to evaluate the long-term safety and efficacy of UCART19 administration to patients with advanced lymphoid leukemia.

Inclusion Criteria:

• Written informed consent obtained prior any study-specific procedure (patient or parent(s) or legal representative)
• Patient dosed with UCART19 who completed or discontinued early from a sponsored or from any investigator-initiated study that tested UCART19, or patients who were administered UCART19 under a special access scheme (compassionate use);
• Female patients of childbearing potential and male patients with partners of childbearing potential must continue to use an effective method of birth control as well as their partners for a 12-month duration after the last UCART19 administration.

Exclusion Criteria:

- No exclusion criteria for this study

Qualified scientific and medical researchers can request access to anonymized patient-level and study-level clinical trial data.

Access can be requested for all interventional clinical studies:

• used for Marketing Authorization (MA) of medicines and new indications approved after 1 January 2014 in the European Economic Area (EEA) or the United States (US).
• where Servier is the Marketing Authorization Holder (MAH). The date of the first MA of the new medicine (or the new indication) in one of the EEA Member States will be considered for this scope.

In addition, access can be requested for all interventional clinical studies in patients:

• sponsored by Servier
• with a first patient enrolled as of 1 January 2004 onwards
• for New Chemical Entity or New Biological Entity (new pharmaceutical form excluded) for which development has been terminated before any Marketing authorization (MA) approval.

After Marketing Authorisation in EEA or US if the study is used for the approval.

Researchers should register on Servier Data Portal and fill in the research proposal form. This form in four parts should be fully documented. The Research Proposal Form will not be reviewed until all mandatory fields are completed.