West Asia Organization for Cancer Prevention (WAOCP), APOCP's West Asia Chapter. Asian Pacific Journal of Cancer Prevention 1513-7368 15 14 2014 12 01 Optimal Timing of Radiotherapy with Alternating/Sequential Radio-Chemotherapy for Limited-stage Small Cell Lung Cancer 5697 5699 29483 EN Journal Article 1970 01 01 <br/><b>Objective</b>: To investigate the optimal timing of radiotherapy with alternating/sequential radio-chemotherapyfor limited-stage small cell lung cancer (LS-SCLC). <br/><b>Methods</b>: 91 patients with LS-SCLC were retrospectivelyanalyzed and divided into two groups according to the number of chemotherapy cycles before radiotherapy.If the patient received radiotherapy after 3 cycles or fewer cycles of chemotherapy, classification was into theearly group, if not, into the late group. All patients received 6 cycles of standard chemotherapy (EP/EC) andconventional radiotherapy (56 gy~ 60 gy/28 f ~30 f). <br/><b>Results</b>: The response rate (RR) of the early and late groupswere 85.7% and 81.6%, respectively, with no significant difference (p>0.05). In contrast, the progression-freesurvival (PFS) in the early group was better than that in the late group (11.8 months vs 9.86 months), and thedifference was significant (p<0.05). There was no significant difference between two groups in adverse reactions,which gastrointestinal irritation and bone marrow suppression being the most common (p>0.05). <br/><b>Conclusions</b>:Radiotherapy after 3 cycles or fewer cycles of chemotherapy does not bring significant benefits for RR of patientswith LS-SCLC, but it could significantly prolong their PFS without increase in adverse reactions. https://journal.waocp.org/article_29483_1fd33ca9efb3f6c43bf872d5ac6ea6ab.pdf