In Geoff Daniels's Human Blood Groups SECOND EDITION page 250 has said "Abnormal expression of some Rh antigens has occasionally been observed in patients with myeloid leukaemias, polycythaemia, and other myeloproliferative disorders. In most cases these patients appear to be mosaics with two populations of red cells of different Rh phenotype [137,656–661], although a few have complete loss of certain Rh antigens [662–665]. One patient with myeloid metaplasia, previously known to be D+ , was found to be D– and had made anti-D plus -C [663]." 663 Cooper B, Tishler PV, Atkins L, Breg WR. Loss of Rh antigen associated with acquired Rh antibodies and a chromosome translocation in a patient with myeloid metaplasia. Blood 1979;54:642–7.