Mrs Berger, from Harrow, north-west London, has a combination of rare tissue types that has made finding a matching donor more difficult.

BBC: Urgent plea for bone marrow donor

Mrs Berger, 61, from from Harrow, north-west London, suffers from myelodysplastic syndrome and has a combination of rare tissue types, making finding a matching donor more difficult.

BBC: Caroline and Sharon Berger