Table 1.

Characteristics of studies included in the pooled analysis of lung bronchioloalveolar carcinoma and tobacco smoking

Study, location	Study design	Definition of ever smoker (cigarettes)	Response rate (%) in ca/co	Total number of lung cancer cases	Number of BAC cases	Number of controls	Special features
UCLA, Los Angeles [16]	Population-based	>100	39/79	611	39	1,040
HU, Boston [17]	Hospital-based	>100	85/55	2,253	204	1,529
UH, Honolulu [18]	Population-based	>185	64/62	635	38	588
WSU1, Detroit [19]	Population-based	≥100	55/71	526	50	460	Women
WSU2, Detroit [20, 21]	Population-based	≥100	66/93	1,006	35	1,184	EO
Mayo [22]	Hospital-based	≥100	87/84	5,698	280	2,269
AHF [23, 24]	Hospital-based	≥100	92/93	5,130	153	4,942

BAC bronchioloalveolar carcinoma, ca cases, co controls, EO early-onset cases