Why undergoing this examination?

Thiopurines are drugs widely used in the treatment of leukaemia (acute lymphoblastic leukaemia, acute myeloid leukaemia and chronic myelogenous leukaemia) and autoimmune diseases (inflammatory bowel disease, ulcerative colitis, Crohn’s disease, rheumatoid arthritis, multiple sclerosis and systemic lupus erythematosus, among others). They are also used as immunosuppressants after transplantation. Genetic variants have been described in the gene encoding the TPMT enzyme, which generate inactive or partially active enzymes. These mutations in the TPMT gene are responsible for the variation in response to treatment with thiopurines and the significant percentage of serious adverse reactions to these drugs.

What is this exam?

The genetic profile FG – Onco Thiopurines studies the main allelic variants of the TPMT gene with known clinical relevance. These mutations are responsible, together, for more than 95% of the reduced TPMT enzyme activity. The aim of the analysis is to identify those patients with a decrease in TPMT enzyme activity and an increased likelihood of developing serious side effects and toxicity to thiopurine treatment.

For whom is it indicated?

• Patients on pharmacological treatment who wish to customize medication based on their genetic profile
• Patients in whom pharmacological treatments do not show the expected results


Next Generation Sequencing (NGS)


• Guaranteed from the experience of the Synlab group, the absolute European leader in laboratory diagnosis.
• Detailed report including, in addition to the type of metabolism of each enzyme, which drugs can generate toxic effects and adverse reactions, as well as dose recommendations.
• Information provided by the analysis allows the selection of the most appropriate drug, and determines the most appropriate dose for each patient.
• Genetic counseling available at no additional cost, according to the needs of each client.

Extra information

DOCUMENTATION – Available on Extranet for clients:
• Informed Consent
• Clinical Questionnaire
• Fasting is not necessary for the test.

Delivery Time
20 working days
Type of Sample
5 mL whole blood in EDTA tube

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