Study	Factors	References
Incidence	Parsis Christians Hindus Muslims Sindhi	Badwe et al., [7] Jussawalla et al., [8] , [15] , [17] Kapoor et al., [13]
Epidemiology	Bombay Eastern Rajasthan Aligarh Bangalore Jammu Surat Chennai	Jussawalla et al., [8] , [9] Sharma et al., [10] Hussain et al., [11] Nanda kumar et al., [12] Kapoor et al., [13] Gadhia et al., [14] Juneja et al., [18]
Risk factors	Family history & late child birth Nulliparity Lipids Environmental pollution	Gajalakshmi et al., [20] , [21] , [22] Ray et al., [23] Rao et al., [24] Bhatt et al., [25]
Mutation Studies	p53 BRCA1	Nayak et al., Shanmugam et al., Kesari et al., [64] , [65] , [66] , [67] , [68] , [69] ; [70] ; [72] Pestonjamasp et al., Kachhap et al., [48] , [71]
Biological markers	NK cells Bleomycin Microvessel densities Plasma prolactin Centromere -- premature separation & aneuploidy, Aphidicolin Lymphocyte cultures Cadherins	Shevala et al., [27] Jyothish et al., [28] Karelia et al., [29] Patel et al., [30] Rao et al., [31] , [32] Trivedi et al., [33] Madhavan et al., [73]
Miscellaneous	Serum carotenoids Trace elements	Ito Y et al., [74] Singh et al., [75]