Fig. 2From: Lipid biomarkers that reflect postoperative recurrence risk in lung cancer patients who smoke: a case–control studyHeat map showing the relative intensities of the screened lipid peaks and Brinkman index (BI) values. The majority of high lipid peaks in the heavy smoker group of the SQCC cohort had apparent positive correlation trends with BI (b). In contrast, a weak positive and negative correlation trend was observed in the smoker group of the ADC cohort (a). Abbreviations: ADC, Adenocarcinoma; BI, Brinkman index; m/z, Mass-to-charge ratio; SQCC, Squamous cell carcinomBack to article page