Hsp70 values measured with a control Hsp70 ELISA that only detects free Hsp70 were significantly lower and did not differ in the course of therapy (NSCLC before RT: 4.5 ± 1.3 ng/mL; n = 80; during RT: 3.5 ± 1.0 ng/mL; n = 58; after RT: 3.8 ± 1.2 ng/mL; n = 56). The gene discussed is HSPA1A; the disease is non-small cell lung carcinoma.