Different suppression of Ph1 positive hemopoiesis induced by intensive chemotherapy in lymphoid and myeloid blast crisis of CML.

Abstract:

BACKGROUND:The suppression of Ph1-positive hemopoiesis is a major goal in the treatment of CML; in this context the CML patients in blast crisis obtaining a complete clinical remission represent a useful model to investigate the behavior of the Ph1-positive and negative clones during bone marrow repopulation after ablative therapy. METHODS:Seven CML patients in blast crisis (four lymphoid and three myeloid) who obtained a complete clinical remission after an intensive polychemotherapy treatment were evaluated by cytogenetic and molecular analysis both in blast and remission phases. Standard cytogenetic and Southern techniques were employed; in addition, minimal residual disease status (MRD) was ascertained by amplification (PCR) of the specific bcr-abl chimeric transcripts. RESULTS:After a single cycle of induction, all lymphoid cases displayed a complete restoration of Ph1-negative hemopoiesis; by contrast, one myeloid blast crisis showed a partial suppression of Ph1-positive hemopoiesis only after two cycles of chemotherapy, and in the remaining two cases the hematological remission was indeed a reversion to the chronic phase. CONCLUSIONS:Ph1-positive chronic clones present in lymphoid blast crisis showed a higher degree of sensitivity to intensive chemotherapy than those present in the myeloid cases. This observation further suggests that the growth properties of the Ph1-positive clones are highly variable from case to case and probably tend to progress during the time-course of the disease.

journal_name

Haematologica

journal_title

Haematologica

authors

Guerrasio A,Martinelli G,Ambrosetti A,Falda M,Paolino F,Rege-Cambrin G,Rosso C,Pignatti PF,Gasparini P,Perona G

subject

Has Abstract,Author List Incomplete

pub_date

1991-03-01 00:00:00

pages

126-30

issue

2

eissn

0390-6078

issn

1592-8721

journal_volume

76

pub_type

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