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DHPLC Determination of TPMT Polymorphisms.

The recruitment status of this study is unknown. The completion date has passed and the status has not been verified in more than two years.
Verified November 2006 by National Institute of Cancerología.
Recruitment status was:  Recruiting
Information provided by:
National Institute of Cancerología Identifier:
First received: November 17, 2006
Last updated: NA
Last verified: November 2006
History: No changes posted
TPMT is a key enzyme in the metabolism of thiopurines. TPMT polymorphisms have been described and are associated with a decrease activity of such enzyme. Therefore, a higher risk of developing toxicity is present in patients requiring these drugs, which are indicated in acute lymphoblastic leukemia, as well as, immunosuppressors after organ transplantation. The frequency of heterozygotes polymorphisms ranges from 3 till 12 %, in different populations. Homozygous patients have a lower frequency, estimated 1 in 300 individuals. The frequency of such polymorphisms in mestizos mexican population has not been analyzed, and we considered important to determine this frequency in healthy and patients requiring thiopurines, particularly acute lymphoblastic leukemia.

Acute Lymphoblastic Leukemia

Study Type: Observational
Study Design: Primary Purpose: Screening
Time Perspective: Cross-Sectional
Time Perspective: Prospective
Official Title: Prevention of Thiopurines Related Toxicity Through the Determination by DHPLC TPMT Polymorphisms in Patients With ALL.

Resource links provided by NLM:

Further study details as provided by National Institute of Cancerología:

Estimated Enrollment: 160
Study Start Date: April 2005
Estimated Study Completion Date: November 2006
Detailed Description:

Objectives: Determine by DHPLC analysis the frequency of TPMT polymorphisms in mestizos mexican population with acute lymphoblastic leukemia.

  • To do a clinical correlation between the presence of polymorphism and thiopurine related- myelotoxicity.
  • Inclusion criteria: Healthy volunteers or patients with acute lymphoblastic leukemia, age > 18 years, who attend to the National Institute of Cancerologia.
  • Exclussion criteria: Patients with ALL, who are unable to have an adequate follow-up.
  • Samples: Genomic DNA from peripheral blood leukocytes was isolated by standard methods. Known (wild-type and polymorphic) sequenced polymerase chain reaction (PCR) fragments of the TPMT gene were used as controls. TPMT gene fragments were amplified. PCR products were then analyzed by denaturating high performance liquid chromatography (DHPLC).

Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   Yes

Inclusion Criteria:

  • Healthy and patientes with acute lymphoblastic leukemia.
  • Age: older than 18 years.
  • Attend to the National Institute of Cancerologia

Exclusion Criteria:

  • Foreign patients with an irregular attendance to the National Institute of Cancerologia
  Contacts and Locations
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Please refer to this study by its identifier: NCT00402090

Contact: Myrna Candelaria, MD (52)55-56280479

National Institute of Cancerologia Recruiting
MExico city, DF, Mexico, 14080
Contact: Myrna Candelaria, MD    (52)55-5628-04-79   
Principal Investigator: Myrna Candelaria, MD         
Sponsors and Collaborators
National Institute of Cancerología
Principal Investigator: Myrna Candelaria, MD National Institute of Cancerologia
  More Information Identifier: NCT00402090     History of Changes
Other Study ID Numbers: 005/007/ICI
CONACYT: Salud-2004-01-005
Study First Received: November 17, 2006
Last Updated: November 17, 2006

Keywords provided by National Institute of Cancerología:
thiopurine methyl transferase

Additional relevant MeSH terms:
Precursor Cell Lymphoblastic Leukemia-Lymphoma
Leukemia, Lymphoid
Neoplasms by Histologic Type
Lymphoproliferative Disorders
Lymphatic Diseases
Immunoproliferative Disorders
Immune System Diseases processed this record on June 22, 2017