Svetlana O. Sharapova, BelarusBelarusian Research Center for Pediatric Oncology, Hematology and Immunology Research
Presenter Of 3 Presentations
RAC2 ACTIVATING MUTATIONS - WHAT IS THE SPECTRUM OF THE DISEASE?
EBV POSITIVE HODGKIN LYMPHOMA, BRONCHIECTATIC AND CELIAC DISEASE IN 12 YEARS OLD FEMALE WITH BIALLELIC MUTATIONS OF THE TTC7A GENE
Background and Aims
Biallelic mutations in tetratricopeptide repeat domain 7A (TTC7A) gene have been shown to cause several overlapping clinical phenotypes in 56 patients worldwide. TTC7A is key factor to bridge the process of both immune system and digestive tract development. Most patients presented with multiple intestinal atresia (MIA) isolated or in association with immunodeficiency.
Here we present a 12-years-old female patient of Slavic origin (Belarus) with EBV positive Hodgkin lymphoma, bronchiectatic and celiac disease with biallelic mutations of the TTC7A gene.
A 8-year-old girl, born to non-consanguineous Belarus parents, presented with chronic obstructive pulmonary disease, multiple bronchiectasias due to repeated pneumonias and bronchitis, was hospitalized for detailed immunologic evaluations. The patient had low T cell (CD3+-470 cells/µL) with expansion of TCRgd T cells, accompanying with diminished numbers of recent thymic emigrants (CD4+CD45RA+CD31+-2.8%), with minor abnormalities in TCRVb repertoire. Humoral abnormalities included low level of IgA (0.03g/L) and diminished percentage of naïve (CD19+CD27-IgD+) B cells (30.8%).
In the age of 10 years generalized lymphadenopathy appeared and classic EBV positive Hodgkin Lymphoma Lymphocyte-rich CD20-negative was established on a resected lymph node. Treatment (2-OPPA; 2-COPP) was complicated with severe mucositis and esophagitis. After treatment patient suffered from lung insufficiency, celiacia (anti-gliadin Ab) and failure to thrive. Accidentally, patient died due to food aspiration at the age of 12 years and later found to have compound heterozygous mutations in TTC7A (p.K606R and p.S672P).
To our knowledge, this is the first case of a potential association between TTC37A mutation and lymphoma development.
GENETIC BASIS OF MALIGNANCY COMPLICATIONS AMONG PID PATIENTS IN BELARUS
Background and Aims
Patients with some forms of primary immunodeficiency (PID) have a markedly increased risk of cancer as compared to the healthy population. The aim of this study was to assess the spectrum of genes and type of malignancies in PID patients in Belarus.
We analyzed the malignancy type, age of onset and genetic bases of PIDs with malignancy onset.
36 PID patients from 35 families of Belarus origin were identified in the National PID registry, 55.5% (n=20) males and 44.5% (n=16) females. Age of malignancy diagnosis ranged 6 m.–21,5 yrs (median–6,5yrs). Fourteen patients (39%), of median age 11.8 years, remained alive at the time of analysis, six out of 14 alive after HSCT. Non-Hodgkin's lymphomas predominate, accounting for 56% of cases (n=20), 28% (n=10) patients experienced acute leukemia (n=3 T-ALL, n=3 AML, n=1 bi-phenotypic), 11% (n=4) patients had Hodgkin lymphoma, n=1 myelodysplastic syndrome, n=1 rhabdomyosarcoma.
All patients had PID diagnosis according strong immunologic abnormalities in cellular and/or humoral immunity. 23 out 36 (64%) had definite genetic diagnosis. The most common genetic abnormality was Nijmegen syndrome (NBS1 Slavic mutation) 39% (n=9), followed by ataxia-telangiectasia 17% (n=4) and one patient with BLM (Bloom syndrome), SH2D1A (XLP I), DNMT3B (ICF), WAS, FOXN1, TTC37A, UNC13D, MYSM1, ELA (Neutropenia), CYBB (X-CGD after HSCT).
In Belarus PIDs more often associated with cancer, include Nijmegen breakage syndrome, ataxia-telangiectasia and combined T/B deficiency.