What is the fine-grained topic of the following text: Of 319 patients randomly allocated to each of the 2 arms, a significantly higher proportion responded to afatinib vs. gefinitib (70.0% vs. 56.0%, respectively; P=.008) for a median duration of 10.1 months (95% CI, 7.82-11.10) and 8.4 months (95% CI, 7.36-10.94), respectively. Only return the topic.
Comparative effectiveness of afatinib and gefitinib in treating patients.