RT Journal Article SR Electronic T1 Paroxysmal nocturnal haemoglobinuria: Nature's gene therapy? JF Molecular Pathology JO Mol Pathol FD BMJ Publishing Group Ltd and Association of Clinical Pathologists SP 145 OP 152 DO 10.1136/mp.55.3.145 VO 55 IS 3 A1 R J Johnson A1 P Hillmen YR 2002 UL http://mp.bmj.com/content/55/3/145.abstract AB The development of paroxysmal nocturnal haemoglobinuria (PNH) requires two coincident factors: somatic mutation of the PIG-A gene in one or more haemopoietic stem cells and an abnormal, hypoplastic bone marrow environment. When both of these conditions are met, the fledgling PNH clone may flourish. This review will discuss the pathophysiology of this disease, which has recently been elucidated in some detail.