Serum lipid profile discriminates patients with early lung cancer from healthy controls

- The value of MALDI-based profiling of serum lipidome as a tool for the early detection of lung cancer was investigated.
- Several components with abundances different between early lung cancer patients and healthy high-risk smokers were revealed.
- Discriminatory components allowed for the development of an effective cancer classifier with AUC = 0.88.
- Reduced level of a few lysophosphatidylcholines, including LPC18:2, was confirmed in samples from cancer patients.

ObjectivesThe role of a low-dose computed tomography lung cancer screening remains a matter of controversy due to its low specificity and high costs. Screening complementation with blood-based biomarkers may allow a more efficient pre-selection of candidates for imaging tests or discrimination between benign and malignant chest abnormalities detected by low-dose computed tomography (LD-CT). We searched for a molecular signature based on a serum lipid profile distinguishing individuals with early lung cancer from healthy participants of the lung cancer screening program.Materials and methodsBlood samples were collected from 100 patients with early stage lung cancer (including 31 screen-detected cases) and from a matched group of 300 healthy participants of the lung cancer screening program. MALDI-ToF mass spectrometry was used to analyze the molecular profile of lipid-containing organic extract of serum samples in the 320-1000 Da range.ResultsSeveral components of the serum lipidome were detected, with abundances discriminating patients with early lung cancer from high-risk smokers. An effective cancer classifier was built with an area under the curve of 0.88. Corresponding negative predictive value was 98% and a positive predictive value was 42% when the classifier was tuned for maximum negative predictive value. Furthermore, the downregulation of a few lysophosphatidylcholines (LPC18:2, LPC18:1 and LPC18:0) in samples from cancer patients was confirmed using a complementary LC-MS approach (a reasonable cancer discrimination was possible based on LPC18:2 alone with 25% total weighted error of classification).ConclusionsLipid-based serum signature showed potential usefulness in discriminating early lung cancer patients from healthy individuals.