International Journal of Hematology and Oncology 2021, Vol 31, Num 1 Page(s): 008-018
Relationship Between PET/CT Response and Survival in Patients with Non-Small-Cell Lung Cancer Treated with Definitive Chemoradiotherapy

Sureyya SARIHAN1, Gokce Belge BILGIN2, Deniz SIGIRLI3

1Uludag University, Faculty of Medicine, Department of Radiation Oncology, Bursa, TURKEY
2Uludag University, Faculty of Medicine, Department of Nuclear Medicine, Bursa, TURKEY
3Uludag University, Faculty of Medicine, Department of Biostatistics, Bursa, TURKEY

Keywords: Non-small cell lung cancer, Definitive chemo-RT, PET/CT response, Survival
We aimed to evaluate the relationship between PET/CT response and survival in patients with non-small cell lung cancer (NSCLC) treated with curative chemoradiotherapy. Between January and December 2012, 51 patients were treated. The median age was 61 (29-79) and the M/F ratio was 46/5. Eighty two percent of the cases were stage III and 53% were squamous cell carcinoma. Median 6300 cGy (4860-7525) radiotherapy delivered and 92% of patients received chemotherapy. The median follow-up was 27 months (7-96 months) in November 2019. The objective response was 71% with CT at 1 month and 76% with PET/CT at 3 months. There was a significant correlation between response-1 and response-3 (p< 0.001). Tumor SUVmean3 < 2.81, SUVmax change ≥ 70% was associated with response-1 (p< 0.05). The median and 5-year overall (OS) and progression-free (PFS) survival rates were 54 months, 40% and 35 months, 38%, respectively. In Cox model, for each 1 unit increase, SUVmeanbase (HR: 1.18, 95% CI: 1.01-1.38) and SUVmean3 (HR: 2.65, 95% CI: 1.24-5.66) were found unfavorable factors for OS, whereas SUVmean3 (HR: 2.01, 95% CI: 1.02-3.93) was also found to be a poor prognostic factor for PFS. PET/CT parameters can be used as useful markers for prognosis in patients with NSCLC undergoing curative chemoradiotherapy. It is believed that early assessment during and after treatment can be advantageous in terms of treatment modification.