Figure 2From: Evaluation of FTIR Spectroscopy as a diagnostic tool for lung cancer using sputum Median second derivative spectra and significant wavenumbers. (A) Median second derivative spectra for cancer and normal sputum. Six major significant peaks are identified (A-F) as described in Table 1. (B) Positions of 92 peaks statistically significant between cancer and normal spectra. Each peak is ranked according to p-value where the lowest p-value attained the highest rank of 1.Back to article page