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Biomedical subjects

R Powles

Publications and source records attributed to R Powles.

189 records · Page 11Linked to original sources
PubMed1971

Method of removing abnormal protein rapidly from patients with malignant paraproteinaemias.

On 48 occasions large quantities of abnormal protein were removed from the blood of 11 patients with malignant paraproteinaemias (plasmacytomas) by exchanging their plasma with reconstituted blood bank plasma. The IBM continuous flow blood cell separator was used to exchange the plasma, a procedure that is safe, very rapid, and with clinical benefits which are much better than can be obtained by conventional plasmapheresis. In addition, the constituents of reconstituted plasma correct deficiencies in normal immunoglobulins found in these patients. Clearly for the management of some patients with paraproteinaemia a cell separator is essential.

Adult↗
PubMedDate not supplied

A novel abl protein expressed in Philadelphia chromosome positive acute lymphoblastic leukaemia.

The Philadelphia (Ph) chromosome breakpoints in chronic myelocytic leukaemia are clustered on chromosome 22 band q11 in a 5.8-kilobase (kb) region designated bcr. The c-abl protooncogene is translocated from chromosome 9 band q34 into bcr and the biochemical consequence of this molecular rearrangement is the production of an abnormal fusion protein bcr-abl p210 with enhanced protein-tyrosine kinase activity compared to the normal p145 c-abl protein. The Ph chromosome translocation is also seen in some acute lymphoblastic leukaemias with B-cell precursor phenotypes some of which have bcr rearrangement (bcr+) and some do not (bcr-). We present evidence that the Ph+, bcr- leukaemias are associated with a novel p190 abl kinase. We propose that acute lymphoblastic leukaemias that are bcr+, p210+ are probably lymphoid blast crises following a clinically silent chronic phase of chronic myelocytic leukaemia arising in multipotential stem cells whereas bcr-, p190+ cases are de novo acute lymphoblastic leukaemias arising in more restricted precursors.

Adolescent↗