Fig. 2. Both allogeneic and autogenic blood transfusions increased lung tumor retention in a storage time–dependent manner. Percentage of lung tumor retention (mean ± SEM) in rats transfused with saline, allogeneic blood (allotransfusion), or autogenic blood (autotransfusion) that was stored for various durations as packed cells. * Significant pairwise difference from the saline control group (protected least significant difference,  P < 0.05). n = 104; saline and 9 days, 12–14 per group; other groups, 4–8.