Table 3. Details of characteristics and therapeutic outcomes of enrolled patients.

Patient	Age	Sex	Tumor location	Tumor diameter, mm	Macroscopic type	Procedure time, min	En bloc/R0 resection	Approach	Adverse events
1	78	M	Pyriform sinus (Lt)	20	IIb	63	Yes/Yes	Both	None
2	62	F	Pyriform sinus (Rt)	17	IIb	27	Yes/Yes	Both	None
3	62	F	Pyriform sinus (Rt)	9	IIb	15	Yes/Yes	Oral	None
4	63	M	Epiglottic vallecula	7	IIb	50	Yes/Yes	Both	None
5	68	M	Posterior hypopharyngeal wall	7	IIc	12	Yes/Yes	Both	None
6	71	M	Pyriform sinus (Lt)	10	IIa	13	Yes/Yes	Oral	None
7	83	M	Pyriform sinus (Rt)	50	IIb	112	Yes/No	Oral	None
8	69	F	Posterior oropharyngeal wall	30	IIb	45	Yes/Yes	Oral	None
9	70	M	Pyriform sinus (Rt)	32	IIc	32	Yes/No	Oral	None
10	67	M	Posterior hypopharyngeal wall	10	IIb	23	Yes/Yes	Oral	None
11	70	M	Pyriform sinus (Lt)	25	IIb	73	Yes/Yes	Oral	None
12	73	M	Pyriform sinus (Lt)	17	IIc	18	Yes/Yes	Oral	None
13	73	M	Pyriform sinus (Rt)	8	IIb	11	Yes/Yes	Oral	None
14	73	M	Pyriform sinus (Rt)	15	IIb	15	Yes/Yes	Oral	None
15	73	M	Pyriform sinus (Lt)	15	IIc	43	Yes/Yes	Both	None
16	66	M	Pyriform sinus (Rt)	18	IIb	30	Yes/Yes	Oral	None
17	68	M	Pyriform sinus (Rt)	33	IIb	93	Yes/No	Both	None
18	76	F	Pyriform sinus (Lt)	10	IIb	21	Yes/Yes	Oral	None
19	64	M	Pyriform sinus (Lt)	28	IIb	40	Yes/Yes	Both	None
20	63	F	Posterior cricoid area	25	IIa	20	Yes/Yes	Oral	None

En bloc resection was defined as resection of the entire tumor in a single piece. R0 resection was defined as complete resection with histologically negative lateral and vertical margins.