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1 Department of Respiratory Medicine, Government TD Medical College, Alappuzha, Kerala, India 2 Department of Anaesthesiology, Government TD Medical College, Alappuzha, Kerala, India 3 Department of Gastroenterology, Government Medical College, Kozhikode, Kerala, India *Corresponding Author Mithun Harold Thomas Senior Resident, Department of Gastroenterology, Government Medical College, Kozhikode, Kerala, India Phone number: 9809587773, Email: drmithunharold@gmail.com Abstract Introduction: Neutrophilia has been associated with many chronic inflammatory lung diseases, lung cancer and systemic inflammatory diseases. A common denominator of inflammation in these entities is Th 17 type of CD4+T cell adaptive immunity. Neutrophil infiltration of tumour microenvironment and peripheral blood neutrophilia has become a focus of attraction in recent research on chronic inflammatory diseases. Many studies have shown that increased neutrophil:lymphocyte ratio(NLR) and advanced lung cancer inflammation index (ALI) are poor prognostic indicators in cancers. Aims: This study aims to find out the neutrophil: lymphocyte ratio in lung cancer patients. Materials and Methods: This study is a retrospective analysis conducted in the Department of Pulmonary medicine in a tertiary care centre in south Kerala. The case records of 50 patients, histologically diagnosed as lung cancer were analysed. NLR was calculated from routine blood examination results. Results: The total number of patients included in the study was 50.The most common histological type of lung cancer was adenocarcinoma in both males and females of all ages. Neutrophil lymphocyte ratio was high in all patients, irrespective of the histological type. Mean value of NLR was 5.33 (reference range, 2.15 or less) (1)

Neutrophil Lymphocyte Ratio (NLR) in Patients with Lung Cancer - An Index of Cancer Related Systemic Inflammation