TY - JOUR T1 - Is primary tumor metabolic activity a risk factor for occult lymph node metastasis in T1-2N0M0 non-small cell lung cancer patients? JF - European Respiratory Journal JO - Eur Respir J VL - 44 IS - Suppl 58 SP - P2772 AU - Fatma Yildirim AU - Murat Türk AU - Ümit Özgür Akdemir AU - Irfan Tastepe AU - Ahmet Selim Yurdakul Y1 - 2014/09/01 UR - http://erj.ersjournals.com/content/44/Suppl_58/P2772.abstract N2 - Objective:In our study we aimed to evaluate the potential risk factors for occult lymph node metastasis with PET-CT in patients with clinically stage I NSCLC.Methods:Hospital records of 26 patients who were clinically diagnosed with stage 1 NSNLC in our unit with PET-CT, operated and underwent systemic lymph node dissection were retrospectively analysed. Demographic features, time to surgery and histologic type, differentiation grade, localisation, diameter at PET-CT and SUVmax values of the tumor were recorded. The patients were divided into three groups according to the diameter and the median SUVmax value of the primary mass at PET-CT: Group 1 (low risk group) T≤ 3 cm and SUVmax< 11.6 , group 2 (middle risk group) 3cm< T≤ 5 cm and SUVmax<11.6, group 3 (high risk group) T≤7 cm or SUVmax≥ 11.6.Possible risk factors for occult lymph node metastasis were evaluated. Results:23 of the patients (88.5%) were male and 3 (11.5%) were female. The mean age was 64.5±9.8.All of the patients were diagnosed with T1-2N0M0 stage 1 with PET-CT preoperatively. 20 of the patients (76.9) had lobectomy, 4 (15.4%) had pneumonectomy and 2 (7.7%) had segmentectomy. All of the patients underwent systemic lymph node dissection during the surgery. In 4 of the patients (15.4%) were surgically N1 lymph node positive Occult lymph node metastasis ratio in groups 1,2 and 3 were 2/9 (22.2%), 1/4 (25.0%) and 1/13 (7.7%) respectively. There were no statistically significant difference between the groups (Table 3).Conclusion:In patients with T1-2N0M0 disease, the size and the SUVmax of the primary tumor cann't be used for the prediction of occult node metastasis. ER -