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      Innovation for rare diseases and bioethical concerns: A thin thread between medical progress and suffering

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          Abstract

          With the development of precision medicines based on small molecules, antibodies, RNAs and gene therapy, technological innovation is providing some exciting possibilities to treat the most severe genetic diseases. However, these treatments do not always lead to a cure for the disease, and there are several factors that may hinder their overall success. Patients living during a period of great medical change and innovation may benefit from these technological advances but may also just face failures, both in terms of frustrated hopes as well as suffering. In this article, we are telling the stories of three children with rare and severe disorders, who live in an age of significant medical changes, bearing the burden of difficult scientific and ethical choices. The first two cases that are suffering respectively from severe immunodeficiency and beta thalassemia have already been described in scientific journals, as well as in popular magazines. Although similar when considering the medical challenges, the two cases had opposite outcomes, which resulted in distinct ethical implications. The third case is a baby with spinal muscular atrophy, living at a time of continued innovation in the treatment of the disease. With these cases, we discuss the challenges of providing correct information and proper counseling to families and patients that are making the bumpy journey on the road of medical innovation.

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          Most cited references41

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          Gene therapy of human severe combined immunodeficiency (SCID)-X1 disease.

          Severe combined immunodeficiency-X1 (SCID-X1) is an X-linked inherited disorder characterized by an early block in T and natural killer (NK) lymphocyte differentiation. This block is caused by mutations of the gene encoding the gammac cytokine receptor subunit of interleukin-2, -4, -7, -9, and -15 receptors, which participates in the delivery of growth, survival, and differentiation signals to early lymphoid progenitors. After preclinical studies, a gene therapy trial for SCID-X1 was initiated, based on the use of complementary DNA containing a defective gammac Moloney retrovirus-derived vector and ex vivo infection of CD34+ cells. After a 10-month follow-up period, gammac transgene-expressing T and NK cells were detected in two patients. T, B, and NK cell counts and function, including antigen-specific responses, were comparable to those of age-matched controls. Thus, gene therapy was able to provide full correction of disease phenotype and, hence, clinical benefit.
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            Lentiviral hematopoietic stem cell gene therapy for X-linked severe combined immunodeficiency.

            X-linked severe combined immunodeficiency (SCID-X1) is a profound deficiency of T, B, and natural killer (NK) cell immunity caused by mutations inIL2RGencoding the common chain (γc) of several interleukin receptors. Gamma-retroviral (γRV) gene therapy of SCID-X1 infants without conditioning restores T cell immunity without B or NK cell correction, but similar treatment fails in older SCID-X1 children. We used a lentiviral gene therapy approach to treat five SCID-X1 patients with persistent immune dysfunction despite haploidentical hematopoietic stem cell (HSC) transplant in infancy. Follow-up data from two older patients demonstrate that lentiviral vector γc transduced autologous HSC gene therapy after nonmyeloablative busulfan conditioning achieves selective expansion of gene-marked T, NK, and B cells, which is associated with sustained restoration of humoral responses to immunization and clinical improvement at 2 to 3 years after treatment. Similar gene marking levels have been achieved in three younger patients, albeit with only 6 to 9 months of follow-up. Lentiviral gene therapy with reduced-intensity conditioning appears safe and can restore humoral immune function to posthaploidentical transplant older patients with SCID-X1.
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              Transplantation of hematopoietic stem cells and long-term survival for primary immunodeficiencies in Europe: entering a new century, do we do better?

              Hematopoietic stem cell transplantation remains the only treatment for most patients with severe combined immunodeficiencies (SCIDs) or other primary immunodeficiencies (non-SCID PIDs). To analyze the long-term outcome of patients with SCID and non-SCID PID from European centers treated between 1968 and 2005. The product-limit method estimated cumulative survival; the log-rank test compared survival between groups. A Cox proportional-hazard model evaluated the impact of independent predictors on patient survival. In patients with SCID, survival with genoidentical donors (n = 25) from 2000 to 2005 was 90%. Survival using a mismatched relative (n = 96) has improved (66%), similar to that using an unrelated donor (n = 46; 69%; P = .005). Transplantation after year 1995, a younger age, B(+) phenotype, genoidentical and phenoidentical donors, absence of respiratory impairment, or viral infection before transplantation were associated with better prognosis on multivariate analysis. For non-SCID PID, in contrast with patients with SCID, we confirm that, in the 2000 to 2005 period, using an unrelated donor (n = 124) gave a 3-year survival rate similar to a genoidentical donor (n = 73), 79% for both. Survival was 76% in phenoidentical transplants (n = 23) and worse in mismatched related donor transplants (n = 47; 46%; P = .016). This is the largest cohort study of such patients with the longest follow-up. Specific issues arise for different patient groups. Patients with B-SCID have worse survival than other patients with SCID, despite improvements in each group. For non-SCID PID, survival is worse than SCID, although more conditions are now treated. Individual disease categories now need to be analyzed so that disease-specific prognosis may be better understood and the best treatments planned. Copyright (c) 2010 American Academy of Allergy, Asthma & Immunology. Published by Mosby, Inc. All rights reserved.
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                Author and article information

                Contributors
                Journal
                World J Clin Pediatr
                WJCP
                World Journal of Clinical Pediatrics
                Baishideng Publishing Group Inc
                2219-2808
                30 August 2018
                30 August 2018
                : 7
                : 3
                : 75-82
                Affiliations
                Department of Pediatrics, Institute of Maternal and Child Health, IRCCS Burlo Garofolo, Trieste 34137, Italy. alberto.tommasini@ 123456burlo.trieste.it
                Department of Pediatrics, Institute of Maternal and Child Health, IRCCS Burlo Garofolo, Trieste 34137, Italy
                Department of Pediatrics, Institute of Maternal and Child Health, IRCCS Burlo Garofolo, Trieste 34137, Italy
                Author notes

                Author contributions: Tommasini A conceived the idea and wrote the manuscript draft; Magnolato A described and discussed the third clinical case and corrected the manuscript; Bruno I supervised and approved the work.

                Supported by the IRCCS Burlo Garofolo, grant No. RC24/17.

                Correspondence to: Alberto Tommasini, MD, PhD, Adjunct Professor, Medical Assistant, Senior Scientist, Department of Pediatrics, Institute of Maternal and Child Health, IRCCS Burlo Garofolo, via dell’Istria 65/1, Trieste 34137, Italy. alberto.tommasini@ 123456burlo.trieste.it

                Telephone: +39-40-3785422

                Article
                jWJCP.v7.i3.pg75
                10.5409/wjcp.v7.i3.75
                6125142
                37bdae49-8a73-4b48-92ee-625c397b36d2
                ©The Author(s) 2018. Published by Baishideng Publishing Group Inc. All rights reserved.

                This article is an open-access article which was selected by an in-house editor and fully peer-reviewed by external reviewers. It is distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial.

                History
                : 27 June 2018
                : 6 August 2018
                : 12 August 2018
                Categories
                Editorial

                x-severe combined immunodeficiency,primary immunodeficiency,beta thalassemia,spinal muscular atrophy,bioethics,history of medicine,precision medicine,genetics

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