Breast of this disease increases significantly each year (Garcia

Breast cancer
is the most prevalent cancer among females globally (Ferlay,
Héry, & Autier, 2010). The incidence of this disease
increases significantly each year (Garcia et al., 2007). It is noticed that more than
200000 breast cancer cases will be detected in the USA in the current year, and
more than 40000 patients of them will not survive (Siegel,
Miller, & Jemal, 2017) . The incidence of this disease
differs from country to another. For example, it is higher in developed nations
such as the United States than developing countries as Saudi Arabia (Ferlay
et al., 2010). Despite the current relatively
lower prevalence of the disease in Saudi Arabia, there is a gradual increase in
incidence over time (Saggu
et al., 2015). Identifying the risk factors for breast cancer may
facilitate early detection and reduce mortality from the disease.


Risk factors for breast cancer
can be categorized into modifiable and non-modifiable risk factors (Kami?ska,
Ciszewski, ?opacka-Szatan, Miot?a, & Staros?awska, 2015). Modifiable risk factors
comprise diet, physical inactivity, exogenous hormonal therapies, tobacco use,
and alcohol consumption. The association between dietary habits and breast
cancer risk is still controversial(Brennan,
Cantwell, Cardwell, Velentzis, & Woodside, 2010; Michels, Mohllajee,
Roset-Bahmanyar, Beehler, & Moysich, 2007) Because of several studies have
shown potential relationship between this factor and breast cancer(Brennan
et al., 2010; Fung et al., 2005) while others not (Dong,
He, Wang, & Qin, 2011; Michels et al., 2007; Sieri et al., 2008). These disparities of findings
might be caused due to differences of cooking methods among different
populations as mentioned by Brennan and colleagues (Brennan et al., 2010). Physical inactivity is another factor that maximizes
the risk of developing breast cancer. Numerous studies have showed this
observation (Niehoff,
White, & Sandler, 2017; Pizot et al., 2016; Wu, Zhang, & Kang, 2013). However, the reality of this
association required more research in depth, because of several confounding
factors interfere with this relationship, such as, social, economic, and nutritional
factors (Ban
& Godellas, 2014). Using contraceptive oral drugs
also was associated with developing breast cancer. This relationship still is
debatable (Kami?ska
et al., 2015; Ozsoy et al., 2017). Some studies reported that
there is association between this factor and developing breast cancer with
longer term users (Ban
& Godellas, 2014; Samson et al., 2017; Zhu, Lei, Feng, & Wang, 2012) and this risk could be
decreased incase of individual ceases its administration by a period of 10
Group on hormonal Factors in Breast Cancer, 1996). In contrast, other
epidemiological studies found no significant relationship between them(Ozsoy
et al., 2017; Westhoff, 1999).

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