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

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

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)
  1. *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.