Delayed hypersensitivity was evaluated in 24 pediatric cancer patients who received intravenous hyperalimentation (IVH). Hypersensitivity, as analyzed by skin test antigens, was recorded before and after IVH therapy. With the exception of malnourished patients, tumor response, nutritional status, and delayed hypersensitivity were not correlated in the way suggested by similar studies in adult patients. However, hypersensitivity was correlated with nutritional status post‐IVH.