We also performed semiquantitative RT–PCR for TrkA and p75NTR as well as NGF, which revealed that NGF and TrkA were expressed higher in the tumour portion than normal epithelium in 89 and 84% of patients, respectively, whereas p75NTR expression was lower in the tumour portion in 42% of patients (Figure 2). The gene discussed is NGF; the disease is neoplasm.