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Norman F. Boyd, MB, FRCP(C); John D. Clemens, MD; Alvan R. Feinstein, MD

Arch Intern Med. 1979;139(3):324-328.

Abstract
To classify the clinical severity of acute leukemia, we have used the degrees of pretherapeutic infection and hemorrhage to construct a taxonomy containing three "stages." The stages are associated with survival gradients that are clinically and statistically distinctive in both acute lymphoblastic leukemia and acute nonlymphoblastic leukemia. Median survival ranged from 64.0 months for stage 1 to 10.5 months for stage 3 in acute lymphoblastic leukemia, and from 7.1 months for stage 1 to 1.2 months for stage 3 in acute nonlymphoblastic leukemia. The gradients, which persist when other prognostic factors and secular therapeutic changes are taken into account, are more distinctive than those found with other forms of stratification.

(Arch Intern Med 139:324-328, 1979)

Author Affiliations
From the Departments of Medicine and Epidemiology, McGill University, Montreal (Dr Boyd), and Yale University, New Haven, Conn (Drs Clemens and Feinstein). Dr Boyd is now with the NCIC Epidemiology Unit, Department of Preventive Medicine and Biostatistics, University of Toronto. Dr Clemens is now with the Department of Medicine, University Hospitals of Cleveland.

Footnotes
Accepted for publication Oct 11, 1978.

Read in part before the national meeting of the American Society of Clinical Investigation, Section of Clinical Epidemiology, Atlantic City, NJ, May 2, 1976.

Reprint requests to Department of Medicine, Princess Margaret Hospital, 500 Sherbourne St, Toronto M4X 1K9, Ontario, Canada (Dr Boyd).

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