Skin test with tumor extract in bronchogenic carcinoma: a preliminary study.

Tumor-specific immunity using delayed hypersensitivity skin testing with extract of undifferentiated carcinoma of the lung was evaluated in 25 consecutive patients with carcinoma of the lung. Eight out of 25 patients reacted well to intradermal injection of the tumor extract. All of the 8 patients were found to have limited disease, and their survival times were longer than those with poor reaction.