OBSERVER VARIABILITY IN HISTOPATHOLOGICAL REPORTING OF MALIGNANT BRONCHIAL BIOPSY SPECIMENS

Aims-To histopathologists to classify lung carcinomas on bronchial bio psy material using the current World Health Organisation (WHO) classif ication. Methods-Eleven histopathologists each reviewed 100 randomly s elected bronchial biopsy specimens which had originally been reported as showing lung carcinoma. A single haematoxylin and eosin stained sec tion from each case was circulated and a standard proforma completed. These were analysed using K statistics. Results-The histopathologists were excellent at distinguishing between small cell and non-small-cell carcinoma kappa = 0.86), but not so good at subclassifying the non-sm all cell carcinoma group kappa = 0.25). Conclusions-The clinically imp ortant distinction between small cell and nonsmall cell carcinoma of t he lung is reliably made by competent histopathologists even on Limite d material.