Fig. 2
![Fig. 2](http://media.springernature.com/full/springer-static/image/art%3A10.1186%2Fs12885-021-08381-8/MediaObjects/12885_2021_8381_Fig2_HTML.png)
Kaplan–Meier survival curves of IC + CCRT, CCRT+AC, and IC + CCRT+AC treatment groups. There were no differences in survival outcomes among treatment groups (P > 0.05 by rank-sum test). The primary endpoint is failure-free survival (FFS) rate, defined as the time between the initial pathological diagnosis of nasopharyngeal carcinoma (NPC) and treatment failure or final follow-up. Secondary endpoints include overall survival (OS), locoregional failure-free survival (LFFS), and distant failure-free survival (DFFS). IC = induction chemotherapy. AC = adjuvant chemotherapy. CCRT = concurrent chemoradiotherapy