Incidence
The incidence of bronchiolo-alveolar carcinoma has been reported to vary from 4–24% of all lung cancer patietnts. An analysis of Surveillance epidemiology and End results registry ( SEER) by Read et al. revealed that although the incidence of BAC has increased over the past two decade it still constitutes less than 4% of NSCLC in every time interval. This difference in the incidence has been attributed to complex histopathology of cancer. While pure BAC is rare, the increase in incidence as seen in various studies can be due to unclear histological classification till WHO came up with its classification in 1999 and then in 2004. Another distinguishing feature about BAC is that it afflicts men and women in equal proportions, some recent studies even suggest slightly higher incidence among women.
Read more about this topic: Bronchioloalveolar Carcinoma
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