<a href="https://en.wikipedia.org/wiki/Hydroxycarbamide" id="mwAVg" rel="mw:WikiLink" title="Hydroxycarbamide">Hydroxycarbamide</a> becomes the first approved preventive treatment for <a href="https://en.wikipedia.org/wiki/Sickle_cell_disease" id="mwAVk" rel="mw:WikiLink" title="Sickle cell disease">sickle cell disease</a>.