Table 1. Review of published literature on thyroid lymphomas.

Asian vs. Western studies	Countries	Authors, year	Study period	Number of cases
Asian studies	China	Wu et al., 2016 (8)	1992–2015	10
		Yang et al., 2015 (9)	1995–2012	12
		Sun et al., 2010 (10)	1991–2007	40
		Lam et al.,1999 (11)	1968–1997	23
	India	Kakkar et al., 2019 (12)	2009 –2015	11
		Gupta et al., 2005 (13)	1998–2004	10
	Japan	Suzuki et al., 2019 (14)	2012–2017	110
		Mizokami et al., 2016 (15)	2005–2014	9
		Kaba et al., 2015 (16)	2007–2010	101
		Yoshida et al., 2013 (17)	2002–2011	6
		Watanabe et al., 2011 (18)	1994–2004	171
		Matsuzuka et al., 1993 (19)	1963–1990	119
		Ota et al., 2006 (20)	2000–2004	170
	Korea	Chai et al., 2015 (21)	2000–2013	38
		Nam et al., 2012 (22)	1995–2010	13
		Hwang et al., 2009 (23)	1991–2006	44
		Kwak et al., 2007 (24)	2003–2005	6
	Malaysia	Sarinah et al., 2010 (25)	1998–2006	17
Western studies	Canada	Moshynska et al., 2008 (26)	1995–2000	12
		Morgen et al., 2010 (6)	1988–2009	9
	Denmark	Pedersen & Pedersen, 1996 (27)	1983–1991	50
	France	Thieblemont et al., 2002 (28)	1987–2000	26
	Italy	Stacchini et al., 2015 (29)	2001–2013	13
		Sangalli et al., 2001 (30)	1980–1998	17
	Poland	Czopnik et al., 2017 (31)	2007– 2015	10
	Serbia	Colovic et al., 2007 (32)	1994–1999	9
	Spain	Lerma et al., 2003 (33)	1992–2001	12
	Turkey	Bostanci et al., 2017 (34)	2009–2015	11
	UK	Alzouebi et al., 2012 (35)	1970–2010	70
		Penney et al., 2011 (36)	1992–2004	35
		Hyjek et al., 1988 (37)	1957–1987	15
	USA	Sharma et al., 2016 (38)	2000–2014	75
		Quesada et al., 2016 (39)	2000–2015	7
		Adhikari et al., 2016 (40)	2000–2013	68
		Boonyaarunnate et al., 2013 (41)	1993–2012	13
		Graff-Baker et al., 2009 (42)	1973–2005	1408
		Ruggiero et al., 2005 (43)	1977–2004	22
		Wang et al., 2005 (44)	1990–2005	5
		Cha et al., 2002 (45)	1985–2000	23
		Derringer et al., 2000 (46)	1985–1993	108