1. Introduction
Breast cancer is a major global health issue, ranking as the second leading cause of cancer-related deaths among women, with approximately 685,000 deaths in 2020 [
1]. In Morocco, 11,747 new cases were diagnosed in women last year, representing about 19.8% of all new cancer cases and 38.9% of all female cancers. Among Arab women, breast cancer typically occurs in younger patients with larger tumors, often at a more advanced stage at diagnosis. Additionally, there is a higher incidence of axillary invasion, a greater proportion of hormone receptor-negative cases, higher tumor grades, and a distinct response to treatment [
2]. A comprehensive understanding of disease dynamics and exploration of therapeutic strategies are essential for effectively addressing the challenge of breast cancer. Its impact extends beyond mere statistics, affecting various regions globally and emphasizing the importance of collaborative efforts to optimize treatment. For instance, breast cancer plays a central role in cancer research, being one of the most studied subtypes worldwide [
3]. It is influenced by a range of risk factors, including socio-economic, hormonal, and genetic factors.
Regarding socio-economic factors, age is a key determinant in disease management. A significant proportion of breast cancer patients are over 50, with many exceeding 65 years [
4] . Younger patients, particularly those under 50, face a higher risk of recurrence [
5], while the overall risk of breast cancer gradually increases with age, from 1.5% at age 40 to over 4% in women aged 70 and above [
6]. Additionally, there is a noticeable correlation between age and breast cancer subtype, with triple-negative breast cancer (TNBC) often prevalent in younger women and luminal A subtype more common in older women [
4]. Meta-analyses suggest that parity may potentially reduce breast cancer risk, although evidence remains inconclusive due to conflicting study results [
7,
8]. Furthermore, the association between parity and breast cancer risk may vary based on factors such as estrogen receptor status and menopausal status.
Multiple pregnancies could be considered a plausible preventive factor for breast cancer, though further research is needed to clarify the underlying mechanisms. Conversely, a study involving 828 patients found that breast cancer is often diagnosed at more advanced stages in women who have had children compared to nulliparous women [
9]. Additionally, women who breastfeed also tend to present with more advanced stages of breast cancer. Obesity is another significant risk factor, defined by a body mass index (BMI) of 30 kg/m² or more, and poses a major concern for breast cancer patients [
10]. In postmenopausal women, a high BMI correlates with increased levels of estrone, estradiol, and free estradiol, suggesting a synergistic effect that exacerbates breast cancer risk [
11]. Research consistently highlights the association between obesity and an increased risk of breast cancer [
12]. In postmenopausal women, estrogen production in adipose tissue further amplifies this effect, especially when combined with a pro-inflammatory diet, increasing breast cancer risk. Overweight women diagnosed with breast cancer had an average rate of 35.52% between 2022 and 2023, underscoring the substantial impact of obesity on breast cancer incidence [
13]. Moreover, physical activity is a crucial marker of a healthier lifestyle, as supported by extensive research [
14]. Studies indicate that reduced physical function is associated with higher cancer mortality rates among survivors, potentially reflecting advanced breast cancer diagnoses [
14]. Nadia Frikha and colleagues suggest that regular physical activity can reduce the risk of developing breast cancer by 15 to 20%, while women who walk three to five hours per week may experience a 20 to 50% reduction in the risk of recurrence of cancer-related mortality [
15].
Moreover, the detection of breast cancer in close family members may suggest a genetic transmission of the disease. However, sporadic cases also occur within some families, complicating the accurate identification of family disease history [
16]. Genetic factors play a significant role in breast cancer predisposition within families, as evidenced by the consistent family risk observed across different countries, environments, and cultures. A meta-analysis of 49 studies, including 48 case-control studies and one cohort study, confirmed this trend, highlighting a higher breast cancer risk for individuals with a family history of the disease. On average, these individuals had approximately a 2.21 times higher risk of developing breast cancer compared to those without a family history [
17]. While periodic screening programs using mammography have proven effective in reducing breast cancer mortality and mitigating its impact, adherence to these programs faces several challenges. Common obstacles include financial constraints and limited socio-economic resources [
18]. Low-income women often encounter these challenges, being less likely to have private health insurance or employment. In contrast, individuals with moderate (OR: 0.69) or high incomes (OR: 0.85) face fewer barriers to screening participation [
19]. Additionally, transportation difficulties hinder access to healthcare facilities, resulting in a 26.4% reduction in screening participation. Among women with a low risk of breast cancer (<20%), those with higher educational levels, such as university graduates (132%), are more likely to undergo MRI screening [
20]. Cancer patients often face psychological issues throughout their diagnosis and treatment journey, including depression, anxiety, and emotional distress. Studies show that depression affects 8 to 24% of these patients [
21], while 19% exhibit anxiety symptoms [
24]. Furthermore, a significant percentage of cancer survivors, 6.6%, suffer from severe psychological distress, a rate considerably higher than that observed in non-cancer adults (3.7%) [
22].
Cancer-related fatigue (CRF) is a common and debilitating complication associated with cancer and its treatments. It is characterized by persistent and debilitating fatigue influenced by various factors such as cancer type and treatment modalities. Effective management of CRF is crucial for improving patient comfort and quality of life, as well as supporting the cancer recovery process [
23]. To further explore the hormonal factors influencing breast cancer risk and treatment outcomes, various reproductive factors have been examined. Among these, age at first childbirth is a key determinant. Early childbirth has been associated with a lasting reduction in breast cancer risk, clarifying the complex interaction between reproductive events and cancer susceptibility [
24] Additionally, breast cancer treatment stratification relies on molecular subtypes, with hormone-dependent cancers being a predominant category. Notably, estrogen receptor expression characterizes the majority of breast cancers, underscoring the therapeutic importance of estrogen deprivation to reduce recurrence risks [
25].
Insights from [
26] underscore the nuanced relationship between oral contraceptive use and breast cancer risk. Oral contraceptives containing ethinylestradiol below 50 µg have been associated with heightened breast cancer risks during and shortly after usage. However, this risk tends to taper off a decade post-discontinuation, with discernible differences in clinical staging among contraceptive users [
27]. Furthermore, Systematic Review [
28] underscores a pronounced elevation in breast cancer likelihood among hormonal contraceptive users, accentuating the imperative of understanding contraceptive influences on breast cancer susceptibility. The age at menarche, marking the onset of menstrual cycles, emerges as a potential risk modulator for breast cancer. Variability across demographics underscores its nuanced role, with early menarche subtly predisposing women to heightened breast cancer risks.
Notably, studies unveil an association between menarche preceding 13 years and increased breast cancer odds [
29], further echoed in case-only studies distinguishing breast cancer subtypes [
30]. In parallel, an intriguing landscape unfolds concerning bone metastases prevalence among breast cancer cohorts. In hormone receptor-positive (HR+) tumors, bone metastases feature in approximately 15% of cases, while up to 50% of HER2-positive breast cancer patients exhibit such metastatic spread [
31]. The landscape is further nuanced by HER2 overexpression in a notable segment of breast cancer cases, coupled with hormone receptor positivity in a significant proportion, albeit with distinct prognostic implications [
32,
33].
The study of the various factors clinical associated with breast cancer helps in understanding its complex nature and multifaceted risk factors. Among the most prevalent forms of breast cancer are invasive ductal carcinoma, where malignant cells originate from the ducts and can spread beyond the breast, infiltrating neighboring tissues and potentially metastasizing to distant parts of the body. Another frequently encountered type is invasive lobular carcinoma, characterized by the growth of cancer cells within the lobules, with the potential to disseminate to nearby breast tissues and other regions of the body.
Expanding on the understanding of various breast cancer types, it is imperative to consider histological grading, a pivotal parameter providing critical biological insights independently of axillary status and tumor size. This grading system offers valuable information regarding tumor proliferation, aberrant cell architecture, nuclear displacement, and chromosomal instability, all of which are integral to assessing the disease prognosis [
34]. The SBR grading score, ranging from 1 to 3, reflects the degree of resemblance between cancer cells and healthy breast cells.
A higher grade indicates a greater deviation in appearance and growth patterns of cancer cells compared to their healthy counterparts [
35]. Type 2 diabetes, affecting over 15 million American women and steadily increasing, is associated with a higher risk of serious complications such as kidney, cardiovascular, retinal diseases, and cancer [
36]. Moreover, diabetes is recognized as a risk factor for breast cancer [
37], as it may lead to increased expression of aromatase, resulting in heightened local production of estrogen. Elevated estrogen levels can stimulate the growth of estrogen receptor-positive breast cancers (ER+) [
38].
Breast cancer treatment strategies encompass a multidisciplinary approach tailored to individual patients. Early-stage breast cancer is often managed with conservative breast surgery or mastectomy, complemented by radiotherapy.
Axillary evaluation via sentinel lymph node biopsy aids in treatment planning. Locally advanced cases may require endocrine therapies, adjuvant chemotherapy, or neo-adjuvant systemic treatments. The classification of breast cancer subtypes informs personalized therapeutic interventions. Hormone receptor-positive subtypes like Luminal A exhibit favorable outcomes, while Luminal B may present challenges due to increased proliferation markers. HER2-positive cancers benefit from targeted therapies, whereas triple-negative breast cancer poses unique treatment hurdles [
39]. Surgery constitutes a cornerstone of breast cancer treatment, offering two primary approaches: breast-conserving surgery (BCS) and mastectomy. BCS preserves healthy breast tissue, while mastectomy involves complete breast removal, often followed by reconstruction. Lymph node removal options include sentinel lymph node biopsy (SLNB) and axillary lymph node dissection (ALND), guided by various clinical factors [
40].
Endocrine therapy is pivotal for hormone receptor-positive breast cancers, encompassing selective estrogen receptor modulators (SERMs) like tamoxifen, which regulate estrogen receptors and inhibit tumor progression. Selective estrogen receptor downregulators (SERDs) and aromatase inhibitors (AIs) offer alternatives, each with distinct efficacy profiles and side effect profiles [
25,
41,
42]. Chemotherapy plays a systemic role in breast cancer treatment, administered in neoadjuvant or adjuvant settings based on tumor characteristics. Neoadjuvant chemotherapy reduces tumor size, facilitating breast-conserving surgery and aiding in prognostic assessment [
43].
Targeted therapies specifically disrupt oncogenic cellular processes, addressing aberrant signaling pathways. For hormone receptor-positive cancers, investigational drugs like rapamycin and mTOR inhibitors show promise. HER2-positive breast cancers benefit from monoclonal antibodies like trastuzumab and pertuzumab, enhancing treatment efficacy.
Triple-negative breast cancer treatments include PARP inhibitors and CDK4/6 inhibitors, targeting specific molecular pathways associated with tumor growth and progression [
44]. For HER2-positive (HER2+) breast cancers, the monoclonal antibody trastuzumab selectively inhibits the proliferation of HER2-overexpressing cells and has been approved for treating HER2+ MBC [
44]. Adding trastuzumab to docetaxel improves progression-free survival and overall survival in patients with metastatic HER2+ breast cancer, with shorter survival observed in the docetaxel-alone group [
45]. Another monoclonal antibody, pertuzumab, blocks heterodimerization and signal transduction via the MAPK and PI3K pathways in HER2-positive patients [
46]. Monoclonal antibodies, such as trastuzumab, have been an effective therapeutic strategy for HER2+ breast cancers for over 20 years. However, primary and acquired resistance to anti-HER2 treatment remains a significant challenge, with up to 50% of patients developing brain metastases during the course of the disease [
44].
Since 2010, lapatinib has been approved in combination with letrozole to treat advanced breast cancer in postmenopausal women, specifically when the tumor is both HER2-positive (HER2+) and hormone receptor-positive (HR+). Recent findings from the CHER-Lob trial have indicated that the combination of lapatinib and trastuzumab yields better results than using trastuzumab alone in the neoadjuvant treatment of early HER2-positive breast cancer in British Columbia [
47]. For triple-negative breast cancer (TNBC), a highly aggressive subtype [
48], olaparib received approval from the US FDA in 2018 for patients with HER2-negative (HER2-) germline BRCA mutations (gBRCAm). In October 2018, talazoparib also gained FDA approval.
Veliparib is often used in the neoadjuvant treatment of TNBC, although its efficacy is still debated [
49]. CDK4/6 inhibitors, such as palbociclib, ribociclib, and abemaciclib, were recently approved in combination with endocrine therapy for advanced and/or metastatic HR+/HER2- breast cancer [
50]. Furthermore, CDK4/6 inhibitors, including palbociclib and ribociclib, have been FDA-approved for TNBC treatment [
51]. The epidermal growth factor receptor (EGFR) is a potential therapeutic target in 89% of TNBC patients [
52], with tyrosine kinase inhibitors like gefitinib and monoclonal antibodies. The combination of gefitinib, carboplatin, and docetaxel can synergistically increase cytotoxicity in TNBC cells [
53].
In this study, we examined various breast cancer risk factors, including socio-economic, hormonal, and clinical factors, as well as the therapeutic strategies implemented at Hassan II Hospital in Agadir, Morocco.
4. Conclusions
Our comprehensive analysis of breast cancer risk factors and treatment strategies offers valuable insights that can significantly impact patient care and decision-making processes within healthcare institutions. By delving into the socio-economic, hormonal, and clinical aspects of breast cancer, our study sheds light on the multifaceted nature of this disease and underscores the importance of personalized, tailored approaches to diagnosis and treatment.
Our findings highlight the critical role of early detection and intervention, particularly in light of the varied incidence rates across different age groups and cancer subtypes. Understanding these nuances allows for the implementation of targeted screening programs and treatment protocols, ultimately improving patient outcomes and survival rates.
Moreover, our study identifies socioeconomic disparities and access barriers that impede optimal care delivery, emphasizing the need for tailored support systems and interventions to address these challenges. By recognizing and addressing factors such as illiteracy, financial hardships, and geographical disparities, healthcare providers can ensure equitable access to quality care for all patients, regardless of their background or circumstances.
Furthermore, our analysis underscores the importance of integrating mental health support into breast cancer treatment protocols, given the prevalence of anxiety and sadness among patients. By addressing psychological distress and providing holistic, patient-centered care, healthcare institutions can enhance overall treatment efficacy and patient satisfaction.
On the clinical front, our study elucidates trends in treatment modalities and their effectiveness in managing breast cancer. By identifying optimal treatment pathways based on tumor characteristics and patient demographics, our findings can inform clinical decision-making and accelerate the development of standardized treatment protocols. Additionally, our comparison of treatment strategies highlights the importance of considering individual patient factors, such as menopausal status, in selecting the most appropriate therapy, thereby optimizing treatment outcomes and minimizing adverse effects.
Overall, our study contributes valuable insights to the field of breast cancer research and clinical practice, offering actionable recommendations to improve patient care, streamline treatment protocols, and ultimately, save lives. By leveraging data-driven approaches and adopting a multidisciplinary, patient-centered approach, healthcare institutions can enhance the effectiveness and efficiency of breast cancer management, paving the way for a brighter, healthier future for all affected individuals.