Evaluating circulating cell-free DNA and DNA integrity index as biomarkers in non-small cell lung cancer oleh Nada Ezzeldin, Dalia El-Lebedy, Mirhane Hassan, Alaa Omar Shalaby, Sabah Ahmed Mohamed Hussein, Ahmed Mohamed Gharib, Gehan Hamdy, Asmaa Mahmoud Mohammed, Abeer Ramadan, Mohamed Emam Sobeih