Correlation between Vitamin D (ng/mL) and percentage of secondary reactive oxygen species after a photoinduced calibrated singlet oxygen delivery in T1/T2 resectable non-small cell lung cancers as compared to healthy controls. N: Number of patients, Ratio as compared to healthy controls (SE in brackets). Reference is calculated from a longitudinal (Historically the same for 5 years) sample. K: NSCLC studied, W: women, M: men, ADK: Adenocarcioma, SCC: Squamous cell carcinoma, Meta +/−: Presence or absence of Metastases.