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Article History

Received: 26 June 2017

Accepted: 26 March 2018

First Online: 16 April 2018

Ethics approval and consent to participate

: The study was conducted in accordance with the Declaration of Helsinki and the Spanish legislation for the use of archived tissue specimens and associated clinical information. The clinical data were retrieved, and the histological samples were collected and analysed with the endorsement of the Madrid Autonomous University Research Ethics Committee (reference CEI: 70–1260). All the specimens were from Spanish Hospital Biobanks Network (RetBioH; ). Biobanks authorized and inspected by National Supervisory Authority for Welfare and Health can provide human specimens collected during diagnostic procedures and associated clinical information for research purposes based on the biobank’s scientific board review. Personal data will be collected, processed and stored adhering at all times to the obligation of maintaining confidentiality, in accordance with current legislation regarding the protection of personal data (Informed consent form: ). Identification of the biological samples of the Biobank will be subjected to a coding process. Each sample is assigned an identification code. Lymphomas were diagnosed according to World Health Organization Classification of Hematological Malignancies and recommendations from the European childhood lymphoma pathology panel.

: Not applicable.

: The authors declare that they have no competing interests.

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