Name the six types of primary lung carcinomas and the prevalence of each.

1. Adenocarcinoma: 35% to 50%
2. Squamous cell carcinoma: 30%
3. Small cell: 15% to 20%
4. Large cell: 10% to 15%
5. Bronchoalveolar: 3%
6. Carcinoid: Less than 1%