Table 1.

Overview of bacteria identified in different tumour types

Cancer	Cancer role	Reference
Lung cancer
Streptococcus mitis	Prevalent	[20]
Staphylococcus epidermis	Prevalent	[20]
Bacillus sp.	Prevalent	[20]
Mycoplasma sp.	Causative	[20,21]
Chlamydophila pneumonia	Causative	[22]
Pancreatic cancer
Robinsoniella peoriensis	Prevalent	[23]
Pedioccoccus acidilactici	Prevalent	[24]
Leuconostoc lactis	Prevalent	[24]
L. mesenteroides	Prevalent	[24]
Breast cancer
Staphylococcus epidermidis	Prevalent	[25]
Mycoplasma sp.	Prevalent	[21]
Oral cancer
Ralstonia insidiosa	Prevalent	[26]
Fusobacterium naviforme	Prevalent	[26]
Prevotella sp.	Prevalent	[26]
Gall-bladder carcinoma
Salmonella typhi	Causative	[27]
H. pylori	Causative	[28]
H. hepaticus	Causative	[28]
H. bilis	Causative	[29]
Pulmonary Mucosa-Associated lymphoid tissue (MALT) lymphoma
Chlamydia pneumonia	Causative	[30]
C. trachomatis	Causative	[30]
C. psittaci	Causative	[30]
Ocular Adenexa MALT lymphoma
C. psittaci	Causative	[31]
Ovarian cancer
Chlamydia trachomatis	Prevalent	[32]
Mycoplasma sp.	Causative	[33]
Mycoplasma sp.	Causative	[21]
Colorectal cancer
Streptococcus gallolyticus	Causative	[34]
Fusobacterium nucleatum	Prevalent (?)	[35,36]
F. necrophorum	Prevalent	[36,37]
F. mortiferum	Prevalent	[36]
F. perfoetens	Prevalent	[36]
Roseburia sp.	Prevalent	[37]
Faecalibacterium sp.	Prevalent	[37]
Escherichia coli	Prevalent	[38]
Citrobacter sp.	Prevalent	[38]
H. pylori	Causative	[39]
Mycoplasma sp.	Prevalent	[21]