Pulmonary inflammation and tumor induction in lung tumor susceptible A/J and resistant C57BL/6J mice exposed to welding fume

Table 3 Gross lung tumor findings for A/J mice 48 and 78 weeks post-exposure

Exposure	Lung Tumor Multiplicity*		Lung Tumor Incidence^†
	48 wk	78 wk	48 wk	78 wk
Sham	0.38 ± 0.13 (21)	1.00 ± 0.35 (19)	33% (7/21)	53% (10/19)
GMA-MS Gas metal arc-mild steel	0.42 ± 0.14 (24)	1.00 ± 0.22 (20)	33% (8/24)	65% (13/20)
GMA-SS Gas metal arc-stainless steel	0.45 ± 0.14 (20)	1.75 ± 0.32 (16)	40% (8/20)	81% (13/16)
MMA-SS Manual metal arc-stainless steel	0.25 ± 0.11 (24)	1.55 ± 0.34 (20)	21% (5/24)	80% (16/20)

*Average number of tumors per lung (± SE) and includes mice with no tumors. Parentheses indicate total animal number. †Percentage of tumor-bearing mice out of the total. Parentheses indicate tumor-bearing/total animal number.

ISSN: 1743-8977