The main aim of this study is to describe how effective and safe the re-treatment of adults with cutaneous T-cell lymphoma (CTCL) with brentuximab vedotin is. Another aim is to describe treatment patterns of persons with CTCL who have received brentuximab vedotin again.

No treatment will be provided during this study. Information already existing in the participants' medical charts will be reviewed and collected.

This is a non-interventional, retrospective study of participants from France, Germany, Spain and Italy with CTCL who were retreated with brentuximab vedotin (BV) after a relapse in at least two different lines of therapy. The participants will be identified from their medical charts and those who meet the eligibility criteria will be included.

The study will enroll approximately 50 participants.

This multi-center trial will be conducted in Europe. The participants are assessed after the last dose of BV for approximately 4 months and followed up for at least 12 months after the re-treatment.

Inclusion criteria:

• Participant with a confirmed diagnosis of CTCL (including Mycosis fungoides (MF), Sézary syndrome (SS), Primary cutaneous CD30+ anaplastic large cell lymphoma (pcALCL) and others) who reached a complete response (CR), partial response (PR) or stable disease (SD) on a previous treatment with BV and whose disease relapsed
• Participant who was treated with BV in at least 2 lines of therapy, other treatments could have been administered in between
• Participant has received three or more cycles of BV in retreatment

Exclusion criteria:

There are no exclusion criteria for this study.

Participants diagnosed with CTCL who were retreated with BV after relapse in France, Germany, Spain, and Italy.

Takeda provides access to the de-identified individual participant data (IPD) for eligible studies to aid qualified researchers in addressing legitimate scientific objectives (Takeda's data sharing commitment is available on https://clinicaltrials.takeda.com/takedas-commitment?commitment=5). These IPDs will be provided in a secure research environment following approval of a data sharing request, and under the terms of a data sharing agreement.

IPD from eligible studies will be shared with qualified researchers according to the criteria and process described on https://vivli.org/ourmember/takeda/. For approved requests, the researchers will be provided access to anonymized data (to respect patient privacy in line with applicable laws and regulations) and with information necessary to address the research objectives under the terms of a data sharing agreement.