Table 2.

Assessing quality of all the 9 included studies

Study	Randomization process	Estimation of sample size	Allocation concealment	Intention to treat analysis	Loss to follow-up	Dropout	Jadad scores
NACT+RT vs. RT
Cvitcovics et al. 7 1996	Yes	Yes	No	Yes	Yes	Yes	3
Chua et al. 8 1998	Yes	Yes	No	Yes	No	Yes	3
Ma et al. 9 2001	No	Yes	No	Yes	Yes	Yes	2
Hareyama et al. 10 2002	Yes	No	No	Yes	Yes	Yes	3
CCRT vs. RT
Chan et al. 22,23 2002,2005	Yes	Yes	No	Yes	No	Yes	3
Kwong et al. 24 2004	No	No	No	Yes	Yes	Yes	2
Zhang et al. 25,26 2005,2013	No	Yes	No	No	No	Yes	2
NACT+CCRT vs. CCRT
Hui et al. 12 2009	Yes	Yes	No	Yes	No	Yes	3
Fountzilas et al. 132012	Yes	Yes	No	Yes	No	Yes	3

NACT: neoadjuvant chemotherapy; CCRT: concurrent chemoradiotherapy; RT: radiotherapy.