Fraction of normal remaining life span: a new method for expressing survival in cancer

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Abstract
To illustrate this concept we used a database of 1134 patients with breast cancer from Bombay who were operated on at Tata Memorial Hospital between 1974 and 1988. The patients were divided into three groups on the basis of the number of involved axillary lymph nodes (0, 1-4, and >4). The survival curves were plotted in two different ways: by the conventional method (fig 1) and by a new way that we call the real life expectancy method (fig 2). The difference in the two methods is not in the statistical handling of data but in the way period of survival is expressed. Both curves were plotted with the computer program SUREAL by the actuarial method.1

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