Metabolic Syndrome in Childhood Cancer Survivors
Metabolic Syndrome in Childhood Cancer Survivors
The research is devoted to studying the features of the metabolic syndrome in cancer
 survivors in childhood is supposed to answer the following questions:

 -  How can metabolic syndrome be diagnosed in the Russian population of survivors of acute
 lymphoblastic leukemia and non-Hodgkin's lymphomas?

 -  What are the features of the clinical symptoms of metabolic syndrome in this category of
 patients?

 -  Which genetic mutations are found in cancer survivors of patients with metabolic
 syndrome; Which of these mutations can be considered as protective or vice versa
 predisposing to the development of metabolic syndromes? Is the metabolic syndrome
 associated with an increased frequency of toxic complications of therapy during the
 intensive stages?
Brief Overview:

 The remarkable progress in developing curative therapy for childhood cancer over the last 4
 to 5 decades has increased awareness of the serious cancer treatment-related late effects
 experienced by long-term survivors such as premature mortality early deaths, second primary
 cancers, organ dysfunction (heart, lung, endocrine system), fertility impairment, cognitive
 deficits, and reduced quality of life. Endocrine disorders, which occur in 30% to 70% of
 childhood cancer survivors, are among the most frequent late effects of anticancer therapy.
 Survivors treated with radiation and alkylating agent chemotherapy for hematological
 malignancies and CNS tumors are at a particularly high risk for endocrine dysfunction.

 Most anticancer drugs act directly or indirectly by modifying intracellular metabolism.
 Therefore, high frequency of acute and late cancer treatment-related organ toxicity can
 result in metabolic disorders. For example, steroid-induced hypercortism blocks glycolysis
 and results in insulin resistance of tissues. Insulin resistance is associated with earlier
 manifestation of diabetes mellitus, obesity etc. The clinical sequelae of metabolic syndrome
 developing in childhood cancer survivors may include insulin resistance, fasting
 hyperglycemia, endothelial failure, obesity, dyslipidemia, hypertension, chronic fatigue
 syndrome, motor and behavioral disorders.

 Modern genetics make it possible to create a basis for a personalized approach to the
 prevention of early and late toxic effects caused by anticancer therapy and the
 rehabilitation of the childhood cancer survivors.

 Objectives:

 Specific Aim 1. Evaluate the frequency and clinical features of the metabolic syndrome in
 childhood cancer survivors.

 Hypothesis 1A: Components of the metabolic syndrome are realizing in children and adolescents
 at all stages of therapy of leukemia and lymphomas, can influence the development of
 complications and late toxic effects.

 Hypothesis 1B: Initial health conditions (abnormal IBM, family history, comorbid diseases);
 drug's toxicity could influence to the appearance of early manifestation of metabolic
 syndrome.

 Specific Aim 2: Evaluate the contribution of functional polymorphisms in candidate genes to
 metabolic syndrome outcomes among childhood cancer patients.

 Hypothesis 2A: Genetic polymorphisms involved in the regulation of the insulin resistance and
 cancer medications during treatment contribute to the development of metabolic syndrome in
 childhood cancer survivors.

 Specific Aim 3: Assess the extent to which genetic predictors, doses of drugs, risk factors
 improve the discriminatory performance of standard clinical prediction models for metabolic
 syndrome outcomes among childhood cancer survivors.

 Hypothesis 3 A: Development of metabolic syndrome in cancer patients depends of genetic
 determinants and toxic effects of antitumor therapy.

 Secondary Aim 1: Assess the definition of metabolic syndrome in cohort of patients of
 leukemia and lymphoma and survivors.

 Hypothesis 1A: Episodes of triglyceridemic, insulin resistance (Hyperglycemia, HOMA>2,7,
 Steroid Diabetes) during the treatment could be the base evidence marker of Metabolic
 Syndrome in patients treated by antitumor therapy.

 Hypothesis 1 B: Endothelial dysfunction as a clinical component of metabolic syndrome is
 responsible for cardiovascular abnormalities in cancer survivors.

 Exploratory Aim 1: Assess the association of biomarkers and genetic predictors among
 childhood cancer survivors with therapeutic exposures (chemotherapy and/or radiation therapy)
 and metabolic syndrome.

 Evaluation:

 Eligible persons who consent to participate in this trial will be asked to do the following:

 -  Vital sign measurement including resting heart rate, blood pressure, height, and weight.

 -  A total of 12 mL of blood will be collected in 3 test tubes. Biomarker analysis will be
 completed by Laboratory of Dmitry Rogachev National Medical Research Center.

 -  A Total of 4 mL of blood in 1 test tube will be used for genotyping for the presence of
 polymorphic variants in genes involved in the biotransformation of xenobiotics, insulin
 resistance and carbohydrate metabolism in the biomolecular laboratory of Dmitry Rogachev
 National Medical Research Center.

 -  An echocardiogram and ultrasound will be performed to assess cardiac function.

 -  CAVI and ABI pulse wave velocity will be non-invasively measured by using the SphygmoCor
 VaSera VS-1500N. Arterial pressure waveforms will be recorded with a strain gauge
 pressure sensor placed lightly over the radial artery before and after "6-minutes
 physical activity".
Inclusion Criteria:

 -  Cancer survivors:

 -  Treatment with chemotherapy and/or radiation therapy for a primary ALL/NHL diagnosed
 prior to age 17 years.

 -  ≤ 15 years of age at the time of enrollment.

 -  No cytostatic drugs uptake during the study.

 Exclusion Criteria:

 -  Diagnosis of diabetes mellitus types 1 or 2 types before antitumor therapy

 -  Active oncological disease

 -  History of allogeneic hematopoietic cell transplant

 -  The renouncement of participation from the patient or legally authorized
 representative