The limitations of using hospital controls in cancer etiology--one more example for Berkson's bias.

The aim of this report was to present an example in which Berkson's bias, most probably, affected the results of a study by overriding the influence of a well-established risk factor (smoking) in the etiology of bladder cancer. The results of a study of 140 male patients with bladder cancer and 280 matched hospital controls confirmed the etiological role of industrial occupation in bladder cancer but failed to confirm the role of smoking. We reanalyzed the proportion of chronic related morbidity as well as the rate of smoking in patients with lung disease in cases and controls.

Selected risk factors for transitional cell bladder cancer.

Cancer of the bladder has long been associated with environmental risk factors, such as occupational hazards and smoking. The aim of the current study was to evaluate the contribution of known risk factors on a community basis in the 1990s, in view of the recent worldwide efforts to control environmental hazards. The study population included 140 male patients and 280 matched controls.

Cavernous hemangioma of the adrenal gland.

Adrenal hemangiomas are rare and seldom found ante mortem. We report a case of adrenal hemangioma that was discovered incidentally and removed surgically. The pertinent literature is reviewed.