Table 1:

Descriptive Features of Included Studies

References	Country	Year Published	Patients (n)	Male (n)	Female (n)	Mean Age (years)	Treatment Groups
Aksu et al 14	Turkey	2006	80	41	39	-	Surgery + Radiation, Radiation
Bossi et al 15	Italy	2014	171	141	30	-	Surgery + Radiation, CRT
Chung et al 16	Korea	1997	33	30	3	58.4	Surgery, Radiation
Culie et al 11	France	2021	382	280	102	61.6	Surgery + CRT, CRT
Culie et al 12	France	2021	474	356	118	60.3	Surgery + CRT, CRT
Debenham et al 17	Canada	2016	233	203	30	56	Surgery + CRT, CRT
Fein et al 18	USA	1994	170	117	53	60	Surgery + Radiation, Radiation
Givens et al 19	USA	1981	104	-	-	60	Surgery, Surgery + Radiation, Radiation
Hicks et al 4	USA	1998	76	-	-	-	Radiation
Inagi et al 20	Japan	2002	87	73	14	-	Surgery, Surgery + CRT, Radiation, CRT
Jones et al 21	UK	1998	105	78	27	-	Surgery + Radiation, Radiation
Jones et al 22	UK	2007	123	82	41	-	Surgery + Radiation, Radiation
Kajanti et al 23	Finland	1991	75	54	21	-	Surgery + Radiation, Radiation
Kamran et al 24	USA	2018	22676	19036	3640	-	Surgery + CRT, CRT
Kano et al 25	Japan	2013	186	164	22	-	Surgery, CRT
Kao et al 26	Australia	2018	98	79	19	57.3	Surgery + CRT, CRT
Kim et al 27	Korea	2010	133	104	29	61.5	Surgery + CRT, CRT
Kobayashi et al 28	Japan	2016	62	45	17	63.6	Surgery, Surgery + Radiation, CRT
Kokemueller et al 29	Germany	2011	341	226	115	58.8	Surgery + CRT, CRT
Kravets et al 30	Ukraine	2020	211	176	35	56.1	Surgery + CRT, CRT
Kurita et al 31	Japan	2003	64	38	26	-	Surgery + CRT, CRT
Lanza et al 32	Italy	2000	115	108	7	63	Surgery + Radiation, CRT
Ling et al 33	China	2013	210	113	97	-	Surgery, Surgery + Radiation, CRT
Lybak et al 34	Norway	2017	226	174	52	62	Surgery + CRT, CRT
Mahmoud et al 35	USA	2018	1873	1571	302	-	Surgery + CRT, CRT
McDowell et al 36	Australia	2014	31	21	10	61.6	Surgery + CRT, CRT
Meccariello et al 37	Italy	2020	129	102	27	62.6	Surgery + CRT, CRT
O’Connell et al 38	Canada	2013	344	141	203	58.7	Surgery + Radiation, Surgery + CRT, Radiation, CRT
Park et al 39	Korea	2013	114	103	11	-	Surgery + Radiation, Surgery + CRT, CRT
Park et al 40	Korea	2018	102	85	17	-	Surgery + CRT, CRT
Rana et al 41	Germany	2011	398	224	174	49.5	Surgery + CRT, CRT
Rash et al 42	USA	2018	51	38	13	-	Surgery + CRT, CRT
Seikaly et al 43	Canada	2016	200	158	42	55.4	Surgery + CRT, CRT
Sessions et al 44	USA	2002	332	209	23	-	Surgery, Surgery + Radiation, Radiation
Sher et al 45	USA	2018	884	727	175	61.5	Surgery, Surgery + Radiation, Surgery + CRT, Radiation, CRT
Sher et al 46	USA	2019	2754	1978	776	-	Surgery + CRT, Radiation, CRT
Shirazi et al 47	USA	2006	74	61	13	-	Surgery + CRT, CRT
Smith et al 48	USA	2015	80	61	19	-	Surgery, Surgery + CRT, CRT
Song et al 49	Korea	2017	586	523	63	55	Surgery + CRT, CRT
Thakar et al 50	India	2021	146	135	11	54.6	*
Tsai et al 51	Taiwan	2021	1180	1052	128	-	Surgery, CRT
van de Pol et al 52	Netherlands	2004	88	64	24	53.4	Surgery + Radiation, Radiation
Yen et al 53	Taiwan	2022	60	57	3	-	*
Zubair et al 54	UK	2021	272			-	*

-Data not provided in text.

^*Reported on hazard ratios between treatment groups.