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Randomized trial of splenectomy in Ph1-positive chronic granulocytic leukaemia, including an analysis of prognostic
Insights
Early splenectomy did not improve survival or quality of life for patients with Ph1-positive chronic granulocytic leukaemia (CGL). Spleen size emerged as a reliable prognostic indicator for most patients.
Area of Science:
- Hematology
- Oncology
- Clinical Trials
Background:
- Ph1-positive chronic granulocytic leukaemia (CGL) is a myeloproliferative neoplasm.
- Early intervention strategies for CGL, including splenectomy, have been investigated to improve patient outcomes.
Purpose of the Study:
- To evaluate the efficacy of early elective splenectomy in Ph1-positive CGL.
- To determine if splenectomy impacts the transformation phase, survival, and quality of life post-transformation.
- To identify prognostic factors for Ph1-positive CGL.
Main Methods:
- A randomized trial involving 169 patients with Ph1-positive CGL between September 1972 and March 1979.
- Comparison of outcomes between patients undergoing early elective splenectomy and those not receiving it.
- Analysis of prognostic indicators including spleen size, hemoglobin, leukocyte count, and clinical grade.
Main Results:
- Early elective splenectomy did not demonstrate a benefit in deferring transformation or prolonging survival.
- Splenectomy did not improve the quality of life following disease transformation.
- Spleen size, hemoglobin concentration, leukocyte count, and clinical grade were identified as significant prognostic factors.
- Prognostic prediction showed only marginal improvement when combining multiple features due to high correlation.
Conclusions:
- Early elective splenectomy is not beneficial for Ph1-positive CGL patients in terms of survival or quality of life.
- Spleen size is a reliable prognostic indicator for the majority of CGL patients.
- Developing universally applicable staging systems for CGL remains challenging due to inconsistent prognostic features across studies.
Abstract:
Between September 1972 and March 1979, 169 patients suffering from Ph1-positive chronic granulocytic leukaemia (CGL) were entered into a randomized trial designed to discover whether early elective splenectomy would defer the onset of transformation and so prolong survival and whether the quality of life following transformation was improved. In contrast with the findings in the non-randomized comparison which led to this trial, no benefit of splenectomy was found in either respect. Four features recorded at presentation were found to be strongly related to prognosis; namely, spleen size, haemoglobin concentration, leucocyte count, and clinical grade. As a result of the high degree of correlation between these features, however, information on more than one allowed a prediction of prognosis that was only marginally better than that achieved by just one. Comparison with another large series illustrates the difficulty of discovering generally applicable 'staging' systems. Furthermore the prognostic features which have emerged in several large series have not been entirely consistent. On balance, for the majority of patients with no specially extreme other features, spleen size is probably as reliable an indicator of prognosis as any other feature or combination of features.