The engrafted tumor retained key mesothelioma features, including strong positivity for Pancytokeratin (Figure 2E), Calretinin (Figure 2D), and WT1 (Figure S1), as well as typical expression patterns for mesothelioma Mesothelin (Figure 2F) and EMA (Figure 2C). The gene discussed is CALB2; the disease is mesothelioma.