Lavish promises of future treatments tend to be based on preliminary clinical trials – and should a child fall ill today, in many cases the technology doesn’t exist to actually use the harvested stem cells. In fact, some experts believe that reintroducing banked cord blood into a child could increase the chance of relapse– as disease-causing cells that existed from birth would be stored alongside useful stem cells.
‘Parents are worried that by not storing cord blood, they aren’t giving their child the best possible chance for future health,’ says leading consultant gynaecologistand obstetricianMr Dickinson Cowan, who admits that when he first came across private banking, he thought it was a good idea. ‘I’d never recommend it now,’ he says.
现在英国约有十家公司提供冷冻储存脐带血的服务,业内人士估计,英国有10万父母选择为孩子保存脐带血。据预测,全球干细胞市场份额在2017年将多达400亿英镑,增至原来的三倍。
脐带血含有胎儿的干细胞。它们可以发展成更专门的细胞,而且几乎能无限地被复制。目前有针对一系列应用的研究——从生成新器官到治疗截瘫。理论上,干细胞可通过替换受损或病变的细胞来治疗疾病。它们被用在骨髓移植中,用来治疗白血病。不过,在这些情况下,干细胞从捐赠者按正常方式抽取的血液中获得。
为了储存脐带血干细胞,脐带血在婴儿出生后数分钟内被抽取,并迅速由专递员送去处理。任何在未来会有使用价值的细胞都要在零下180摄氏度的环境中储存,这样才能保存25年。
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2020-09-15
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