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Potential roles of berries in the prevention of breast cancer progression


Breast cancer (BC) encompasses a collection of different diseases characterized by different biological and pathological features, clinical presentations, responses to treatments, clinical behaviors and outcomes. BC remains the most prevalent cancer type among women globally with over 2 million new cases in 2018. Major treatment strategies for BC consist of radiotherapy, surgery and chemotherapy, either separately or in combination. However, bioactive compounds present in fruits and vegetables have been demonstrated to exert multiple anti-tumoral effects, such as inhibition of cell proliferation, modulation of cell signaling pathways and gene expressions and induction of apoptosis. Accordingly, berries are gaining increasing attentions for their chemopreventive and therapeutic potential against several cancers, including BC. Their composition includes dietary fiber, organic acids, certain minerals in trace amounts, some vitamins and phytochemicals (such as, phenolic compounds). All of these components, individually or combined, are associated with their antioxidant properties and responsible for their health benefits. Therefore, the aim of this review is to discuss the recent evidence, obtained from in vitro, in vivo and human studies, on the potential roles exerted by different phenolic compounds or different phenolic extracts from berries in the prevention of BC progression.



3D culture.


Aqueous extract of berries of Pimenta dioica Allspice.


Protein Kinase B.


Bcl-2-like protein 4.


Blueberry. BBR Berberine.


Breast Cancer.


B-cell lymphoma 2.


Biogenic Core-Shell nanoparticles.


Black raspberries.




Cornus alba.


Cornus flaviramea.


Chloroform Fraction of S. nigrum.


Cornus kousa.


Cornus mas.


Cornus officinalis.


Ellagic Acid.


Ethanol Extract isolated from Goji berry.


Epidermal Growth Factor Receptor.


Estrogen Receptors.


Human Epidermal Growth Factor Receptor-2.


Human Epidermal Growth Factor Receptor-3.


Extracellular-signal-Regulated kinase.


Human Epidermal Growth Factor Receptor-2.


Hypoxia-Inducible Factor 1-alpha.




Mitogen-Activated Protein Kinase.


Monocyte chemoattractant protein 1.


Macrophage colony-stimulating factor.


Matrix metalloproteinase-2/Matrix metalloproteinase-9.


Multidrug Resistance-Associated Protein 2. mTOR mammalian Target of Rapamycin.


Not Otherwise Specified.


Protocatechuic Acid.






Phosphoinositide 3-kinase.




Progesterone Receptors.


Polyphenol-Rich Strawberry Extract.


R. fairholmianus root methanolic column subfraction.


Reactive Nitrogen Species.


Reactive Oxygen Species.


Relative Risk.


Signal Transducer and Activator of Transcription-3.


Vascular Endothelial Growth Factor.


Withania coagulans.


Breast cancer (BC) remains the most prevalent cancer type among women globally with over 2 million new cases in 2018 [1]. BC encompasses a collection of different diseases characterized by different biological and pathological features, clinical presentations, responses to treatments, clinical behaviors and outcomes [2]. Its traditional classification was according to histological parameters, separating BCs into ductal, lobular, nipple, or not otherwise specified (NOS) [3]. Nowadays, molecular classification using immunohistochemistry to reflect the hormone-responsiveness of the tumors and other cell markers have become increasingly useful for dictating treatment and prognosis [3]. The molecular subtypes of BC, which are based on the presence or absence of estrogen receptors (ER), progesterone receptors (PR), and human epidermal growth factor receptor-2 (HER2), include: (i) luminal A (ER+ and/or PR+; HER2–); (ii) luminal B (ER+ and/or PR+; HER2+); (iii) basal-like (ER–, PR–, and HER2–); and (iv) HER2-enriched (ER–, PR–, and HER2+) [4–6]. Tumors in a specific histological subtype do not always belong to the same molecular classification. In addition, the hormone responsiveness does not determine the molecular subtype [7].

Major treatment strategies for BC consist, either separately or in combination of, radiotherapy, surgery and chemotherapy [8]. In recent years, phytochemicals present in plant foods were used to develop novel agents to suppress the progression of cancers because they are considered to be relatively safe, as evidenced through the extensive human consumption [9]. In this sense, berries are gaining increasing attentions for their chemopreventive and therapeutic potential against several cancers [10].

The most commonly widely consumed berries in the world are cranberries (Vaccinum macrocarpon), blackberries (Rubus species), blueberries (Vaccinum corymbosum), raspberries (Rubus ideus) and strawberries (Fragaria ananassa) together with elderberries, mulberries and other less common red fruits in some particular environments [11–13]. Their chemical composition is variable depending on the cultivar and variety, growing location and environmental conditions, plant nutrition, ripeness stages, time of harvest, as well as subsequent storage conditions [14]. They contain a high amount of dietary fiber (cellulose, hemicellulose and pectin), organic acids (citric, malic, tartaric, oxalic and fumaric acids), certain minerals in trace amounts, some vitamins (ascorbic and folic acids) and phytochemicals (such as phenolic compounds) [14].

Phenolic compounds present in berries include flavonoids, such as anthocyanins (i.e., cyanidin glucosides and pelargonidin glucosides), flavonols (quercetin, kaempferol and myricetin), flavanols (catechins and epicatechin), phenolic acids (hydroxybenzoic and hydroxycinnamic acids) and hydrolysable tannins (such as ellagitannins) [15]. These components, either individually or combined, have been considered to associate with their antioxidant properties and are responsible for most of berry health benefits.

The bioavailability of phenolic compounds is generally measured by the evaluation of urine excretion [16–18]. Anthocyanins, for example, are widely reported to have low bioavailability, with the majority of studies recording peak plasma concentrations ranging from 1 to 120 nmol/L [19] and urinary recoveries <2% of intake [20, 21]. On the other hand, it is almost certainly that potential in vivo health effects of anthocyanins are the results of the presence of their metabolites in the circulatory system rather than the parent compounds, which are present in the ingested foods. Anyway, anthocyanins are considered to be a good candidate for preventing the development of cancers by protecting cells from the damage caused by reactive oxygen species (ROS) [22]. Furthermore, bioactive phytochemical compounds such as phenolic acid, proanthocyanidins, anthocyanin and other flavonoids offer protection against BC by arresting the cell cycle [23].

Health benefits associated with phytochemicals and dietary compounds intake are currently being investigated and have recently gained attention because numerous studies have delineated their potential roles in preventing, inhibiting and reversing the progression of cancers. This review aims to update and discuss the effects that different phenolic compounds or different phenolic extracts from berries on BC prevention and management. In particular, in vitro, in vivo and human studies published in the last five years were discussed.

2Biological activities of berries and their bioactive compounds against breast cancer

The latest developments on the preventive and therapeutic activities of berries and their bioactive compounds from in vitro, in vivo and human studies against BC have been summarized in Fig. 1.


Anti-tumor and anti-cancer effects of different phenolic compounds or different phenolic extract from berries.

Anti-tumor and anti-cancer effects of different phenolic compounds or different phenolic extract from berries.

2.1Isolated compounds

Berberine, delphinidin, myricetin, piceatannol, quercetin and resveratrol together with their derivatives are among the most studied phenolic compounds during the last 5 years (Table 1).

Table 1

Effects of isolated compounds on in vitro and/or in vivo models of breast cancer

Extracts/Fraction/ComponentExperimental modelDosage and duration of treatmentBiological response/involved pathwayRef.
Berberine chloride (BRB), NAX012, NAX013, NAX014 &NAX035.Human breast cancer cell line SK-BR-3.50 μM of BBR, NAX012 or NAX014 for 24, 48 &72 h.-↑Cytotoxicity. -↑Apoptosis.[25]
-↑Expression of senescence-related genes.
-↓HER-2/neu expression on tumor cells.
-↓Phosphorylation on tumor cells.
DelphinidinHuman breast cancer cell line MDA-MB-231.5 μmol/L of delphinidin.-↓Cell proliferation.[27]
MyricetinHuman breast cancer brain metastasis cell lines (BCBM, MDAMb-231Br).In vitro: 2.5, 5 &10 μM of myricetin for 24 &48 h.-↓Migration.[28]
Female BALB/c mice (six-week-old) injected with mouse breast cancer cell lines (4T-1).In vivo: Intraperitoneally dosed daily (25 and 50 mg/kg) starting 48 h and continued until sacrifice on day 14.-↓Invasion.
-↓MMP-2 &MMP-9 protein expression.
-↓mRNA levels of MMP-2/9.
-↓gene expression of ST6GALNAC5.
-↓Tumour nodules in vivo.
PiceatannolFemale BALB/c mice (four-week-old) injected with 4T1 murine mammary carcinoma cell line.10- or 20-mg/kg body weight/day of piceatannol was orally administered daily for 30 days, starting 1 day after the implantation of tumor cells.-↓Tumor proliferation.[9]
QuercetinHuman breast cancer cell line MCF-7.[30]
ResveratrolHuman breast cancer cells T-47D.0–100 μM of resveratrol for 24 h &6 days.-↓Cell proliferation.[32]
-↓p53 protein expression.
-↓ERα protein expression.
Resveratrol analog, HPIMBDBreast cancer cell lines MCF-7, T47D & MDA-MB-231.50 μM of resveratrol and 25,50 &100 μM of HPIMBD for 12, 24, 48 &72 h.-↑mRNA and protein expression levels of ERβ.[34]
-↓mRNA and protein expression levels of ERα.
Resveratrol analogue, HS-1793Human breast cancer cell lines MCF-7 (wild-type p53) and MDA-MB-231 (mutant type p53).12.5, 25 &50 μM of resveratrol and 3.0, 6.25, 12.5, 25 &50 μM of HS-1793 for 24 h.-↓Cell growth.[31]
-↑Cell cycle arrest.
Resveratrol derivative, UHA6052Human breast cancer cell line MCF-7.0.625, 1.25, 2.5, 5, 10 &20 μM of UHA6052 for 2, 4 &7 days.-↓Cell proliferation in 3D culture.[35]

Berberine (BBR) is a naturally occurring isoquinoline alkaloid isolated from Barberry (Berberis vulgaris L., Berberidaceae family) and many other plants used in Chinese herbal medicine [24]. Pierpaoli et al. (2013) [25] investigated the antitumor effect of BBR and of four selected BBR derivatives (NAX012, NAX013, NAX014 and NAX035) in human HER-2/neu overexpressing BC SK-BR-3 cells. The results demonstrated the greater effectiveness of NAX012 and NAX014 analogs in inducing apoptosis and cellular senescence in HER-2/neu overexpressing tumor cell lines.

Delphinidin is a major anthocyanin that constitutes a core structure same as that present in cyanidin, malvidin, pelargonidin, peonidin and petunidin [26]. Seo (2013) [27] reported that delphinidin inhibits cell growth, proliferation and induces apoptosis in MDA-MB-231 human BC cell line. Result showed that delphinidin inhibited BC cell growth in a dose dependent manner by decreasing the expression of ErbB2, ErbB3, total Akt and phosphorylated Akt. At the same time, Bcl-2 levels were dose-dependently decreased and Bax expression was significantly increased in cells treated with delphinidin.

Myricetin is a natural polyphenol which can be found in teas, wines and berries. Ci et al. (2018) [28] investigated the pharmacodynamic actions and molecular mechanisms of myricetin on BC metastasis which was unknown so far. Results showed that myricetin could significantly block invasion of MDA-MB-231 cells through suppressing the protein expression of MMP-2/9 and the expression of ST6GALNAC5, as well as lung metastasis, suggesting, therefore, that it should be considered as a potential therapeutic candidate for BC.

Piceatannol (PIC, trans-3,4,3’,5’-tetrahydroxystilbene) is a natural polyphenolic stilbene present in rhubarb, berries, peanuts, sugar cane, red wine and the skins of grapes [29]. Song et al. (2015) [9] reported that PIC treatment reduced tumor growth. In tumor tissues, PIC treatment decreased levels of phosphorylation of -NFκB p65 and Signal Transducer and Activator of Transcription-3 (STAT3) together with levels of HIF-1α and multiple proteins involved in regulation of cell cycle progression, angiogenesis, lymphangiogenesis and macrophage infiltration. Moreover, PIC significantly increased apoptotic cells, which was related to increased expression of both Bax and cleaved caspase-3, and decreased Bcl-2 expression. Finally, PIC reduced the number and volume of metastatic pulmonary tumor nodules and expression of MMP-9 in both lung and mammary tumors. It also reduced tissue levels of cytokines/chemokines, including M-CSF and MCP-1.

Quercetin (3,5,7,3’,4’-pentahydroxyflavone) is a natural bio-flavonoid that can be found in fruits, vegetables, seeds, berries and tea. In order to increase the hydrophilicity and drug delivery capability, Rezaei-Sadabady et al. (2016) [30] encapsulated quercetin into liposomes and studied the in vitro effects of this compound on proliferation using MCF-7 human breast carcinoma cells. The anti-proliferative activity of liposomal quercetin was better than that of free quercetin (at equimolar concentrations), suggesting that liposomal quercetin can significantly improve the solubility and bioavailability of quercetin and has the potential to treat breast tumor.

Recent epidemiologic studies have suggested a protective role of phytoestrogens in prevention of breast and other cancers. Resveratrol, a naturally occurring phytoestrogen found notably in red grapes, berries and peanuts [31], has been shown to possess potent anti-cancer properties. Effects on cell proliferation and regulation of both p53 and ERα by resveratrol may lead to further understanding of the relationship between tumor suppressor proteins and steroid receptors in T-47D human BC cells [32]. Resveratrol caused a decrease in the levels of protein expression of p53 and ERα as compared to the control [32]. However, this molecule was proven to have poor bioavailability and, therefore, not relevant to the effects observed in humans [33]. In order to improve the efficacy of resveratrol, several studies focused on synthesizing resveratrol analogues or derivatives to enhance its poor bioavailability. Ronghe et al. (2014) [34] have recently shown that one of the synthesized analogs, 4-(E)-{(4-hydroxyphenylimino)-methylbenzene,1,2-diol} (HPIMBD), has better anti-cancer properties than resveratrol. This novel azaresveratrol analog may inhibit the proliferation of BC cells by differentially modulating the expressions of ERα and ERβ. Kim et al. (2014) [31] studied the effects of a synthetic analogue of resveratrol, HS-1793, on the proliferation and apoptosis using MCF-7 (wild-type p53) and MDA-MB-231 (mutant p53) human BC cells. HS-1793 inhibited cell growth and induced apoptosis in a concentration-dependent manner. Moreover, flow cytometric analysis revealed that HS-1793 induced G2/M arrest in the cell cycle progression in both types of cells. Of note, HS-1793 induced p53/p21WAF1/CIP1-dependent apoptosis in MCF-7 cells, whereas it exhibited p53-independent apoptosis in MDA-MB-231 cells. Lastly, a novel resveratrol derivative (UHA6052) -which is conjugated with caffeic acid- has been examined by Okamoto et al. (2018) [35]. The UHA6052 treatment significantly inhibited MCF-7 cell proliferation in 3D culture 3DC. This effect was stronger than the parent compound, resveratrol, and equally effective as 5-fluorouracil, a conventional cancer therapy drug [36].

2.2Berries and their extracts

Over the years, berries have received much attention from their beneficial health properties [37, 38]; different in vitro and in vivo studies have been performed in the last five years to deeply investigate their roles in BC prevention and treatment (Table 2).

Table 2

Effects of berries and their extracts on in vitro and/or in vivo models of breast cancer

Extracts/Fraction/ComponentExperimental modelDosage and duration of treatmentBiological response/involved pathwayRef.
BlueberryFemale ACI rats (5-6 weeks old).Animals received 5% blueberry diet, either 2 weeks prior to or 12 weeks after E2 treatment.-↓Tumor volume and multiplicity.[10]
-↓CYP 1A1 and ER-α gene expression.
-↓microRNA (miR-18a and miR-34c) levels.
Cornus L. SpeciesHuman breast cancer cell line MCF-7.50–750 μg/mL of aqueous leaf extracts from Cornus mas (CM), C. alba (CA), C. flaviramea (CF), C. kousa (CK) & C. officinalis (CO) for 24, 48 &72 h.-↓Cell proliferation.[42]
Goji berryHuman breast carcinoma cell line T47D.0.05, 0.1, 0.5, 1 &2 mg/mL of ethanol extract isolated from Goji berry (EEGB) for 24 &48 h.-↓Cell proliferation.[43]
-↑Pro-apoptotic proteins’ expression.
-↓Anti-apoptotic proteins’ expression.
Goji berryHuman breast cancer cell line MDA-MB-231.Lycium barbarum fruit (Goji berry red fruit) and Lycium ruthenicum (Goji berry black fruit) extracts.-↓Bcl-2 & ↑Bax expressions at transcriptional levels.[44]
-↑Apoptosis (↑caspase-9 &caspase 3).
-↓EGFR/ERK-MAPK signaling pathway.
-↓PI3K/Akt signaling pathway.
Haskap BerryHuman breast cancer cell line MDA-MB-231.PE: C3G-rich fraction; HPE2: PE subjected to 90°C for 2 h; HPE8: PE subjected to 90°C for 8 h; CE: crude extract for 24 &48 h.-∼Cell proliferation.[45]
JamunFemale ACI rats (5-6 weeks old).AIN-93M diet or diet supplemented with (5%, w/w) Jamun powder for 26 weeks.-↓Tumor incidence.[48]
-↓Tumor burden.
-↓Tumor multiplicity.
-↓Estrogen-associated growth of pituitary prolactinomas, circulating prolactin and estradiol levels.
-Offset estrogen-associated increases in mammary cell-proliferation, ER-α and cyclinD1.
-Modulation of overexpressed (miR-182 and miR-375) or underexpressed (miR-127 and miR-206).
Juniperus oxycedrus ssp. oxycedrus berriesHuman breast cancer cell line MCF-7.50, 80, 200, 300 &400 μg of J. oxycedrus n-butanol extract for 24 h; 5, 10, 20, 30, 40 &50 μM of compound 2 for 24 h.-↓Cell viability by n-butanol extracts.[50]
-↓Cell viability by compound 2 (30 μM).
-∼Apoptosis by compound 2.
-↑Cell cycle arrest at G0/G1 phase by compound 2.
-↓VEGF &pro-inflammatory cytokine (IL-8, IL-12, IP-10, RANTES &MCP-1) levels.
Pimenta dioica berries (Allspice)Human breast cancer cell lines MCF7, MDA-MB231, SKBr3, BT474 &T47D.50–150 μg/mL of aqueous extract of Allspice (AAE) for 24–72 h.-↓Cell proliferation.[51]
Athymic female mice (6–8 weeks old) injected with MB-231 cells.Mice were gavaged daily with a solution of AAE in water (150 mg/kg) for 8 weeks (except in group 5 where were euthanized at the end of 9 weeks because, 4 out of 6 mice (76%) did not have palpable tumor).-↓Replication potential (colony-forming ability).
-↑Autophagy markers LC3B and LC3B-positive puncta. (Silencing the expression of autophagy related genes (ATGs) prevented AAE-induced cell death).
-↓Akt/mTOR signaling pathway.
-↓Tumor growth.
-↑Autophagic tumor cell death in vivo.
Poha Berry (Physalis peruviana)Human breast cancer cell line MDA-MB-231.-↓Cell growth.[52]
Rubus fairholmianusHuman breast cancer cell line MCF-7.5, 10 &20 μg/mL of RFM for 24 h.-↑Cell damage.[53]
-↓Cell number.
-↓Cell viability.
Dalton’s Lymphoma Ascites (DLA) cells were injected subcutaneously of Swiss albino mice for solid tumor growth.25, 50 &100 mg/kg b.wt of RFM for 40 days.-↑Apoptosis.
-↓Tumor volume.
-↓Tumor weight.
-↑Life span.
Ehrlich Ascites Carcinoma (EAC) cells were injected intraperitoneally of Male Swiss albino mice for ascites tumor growth.
Solanum nigrum L.Human breast cancer cell lines MDA-MB-231 &MCF-7.Chloroform fraction of Solanum nigrum L. berries.-↓Cell proliferation.[55]
StrawberryMurine breast cancer cell line A17.In vitro: 0.5, 1, 2.5 &5 mg/mL of polyphenol-rich strawberry extract (PRSE) from ‘Alba’ variety for 48 h.-↓Cell viability.[56]
-↑Cell cycle arrest.
-↑Hypodiploid cells.
Old female FVB/N mice (4 weeks old) injected with A17 cells.In vivo: 15% strawberry extract-enriched food for 13 weeks.- Modulation of genes expression involved in migration, adhesion and invasion processes.
-↓Tumor weight.
-↓ Tumor volume.
StrawberryN202/1A (high levels of HER2/neu oncogene) & N202/1E (low levels of HER2/neu oncogene).Methanolic extract from strawberries of the Alba cultivar for 24, 48 & 72 h.-↓Cell proliferation after 48 & 72 h.[57]
Withania coagulansHuman breast cancer cell line MDA-MB-231.20–200 mg/mL of methanolic extract of dried fruits (berries) of WC for 48 h.-↓Cell viability.[58]

Black raspberries (BRB) contain multiple compounds with chemopreventive potential including vitamins A, C and E, selenium and calcium, numerous complex and simple polyphenols (anthocyanins, ellagitannins, quercetin, ferulic and coumaric acids), various carotenoids and phytohormones such as β-sitosterol. Preclinical studies have shown that freeze-dried BRB powder inhibits the development of oral, esophageal, colon and breast tumors in animals [39].

Blueberry (BB) is among the few fruits that contain five major anthocyanidins (cyanidin, delphinidin, malvidin, peonidin and petunidin) [40]. Anthocyanins activate phase II enzymes and induce apoptosis as well as exert antiproliferative, anti-inflammatory and antiangiogenesis properties [41]. Jeyabalan et al (2014) [10] reported both chemopreventive and therapeutic potentials of highbush BB powder, together with the possible mechanisms by which BB blend may inhibit mammary tumorigenesis. Results showed that tumor volume and multiplicity were significantly reduced. The effect on mammary tumorigenesis was largely due to down-regulation of CYP 1A1, ER-α gene expression and also favorable modulation of microRNA (miR-18a and miR-34c) levels. These data suggest that BB is effective in inhibiting estrogen (E2)-mediated mammary tumorigenesis in both preventive and therapeutic modes.

Cornaceae plants are known for their edible berries and their leaves are used as tea [42]. Aqueous leaf extracts from Cornus mas (CM), C. alba (CA), C. flaviramea (CF), C. kousa (CK) and C. officinalis (CO) were tested for their antiproliferative activity in MCF-7 human BC cells. The tested extracts induced time dependent decreases in cell survival being CA, CO and CM the most effective. The effectiveness was related to the tannins and total polyphenols contents [42].

There are only a few scientifically robust mechanistic studies with Lycium barbarum fruits, also known as Goji berry red fruit, that have addressed preventive or therapeutic potential of BC. Wawruszak et al. (2016) [43] reported the anticancer activity of ethanol extract obtained from Goji berry (EEGB) on T47D human BC cell line. EEGB inhibited the proliferation of BC cells in time-, and dose-dependent manner together with the lack of cytotoxicity to normal human skin fibroblasts. Western blot analysis demonstrated an increase in pro-apoptotic and a decrease in anti-apoptotic protein expression in cells treated with EEGB. Cumaoğlu et al. (2018) [44] investigated the antiproliferative effects of both Lycium barbarum fruit (Goji berry red fruit) and Lycium ruthenicum (Goji berry black fruit) extracts against triple-negative MDA-MB-231 cells and explored the possible mechanisms of their anticancer effects. Results showed that treatment with Goji berry fruit extracts inhibited the expression of anti-apoptotic Bcl-2, but enhanced pro-apoptotic Bax expression at transcriptional levels and induced cancer cell apoptosis by the activation of pro-apoptotic caspase-9 and caspase 3. Goji berry fruit extracts caused the mentioned death of MDA-MB-231 BC cells by inhibiting EGFR/ERK-mitogen activated protein kinases (MAPK) and PI3K/Akt signaling pathways.

The predominant anthocyanin in haskap berries (Lonicera caerulea L.) is cyanidin-3-O-glucoside (C3G) which possesses antioxidant and many other biological activities [45]. The impact of temperature and pH on the degradation of the C3G-rich haskap fraction has been investigated together with the effect of the thermal degradation of the products. The C3G stability in these fractions was studied under elevated temperatures (70°C and 90°C) at three different pH values (2.5, 4, and 7) by monitoring the concentration of C3G and its major degradation products, protocatechuic acid (PCA) and phloroglucinaldehyde (PGA), using liquid chromatography mass spectrometry. PGA but not PCA exhibited cytotoxic effects against MDA-MB-231 cells. The results suggest that thermal food processing of haskap could influence its biological properties due to the degradation of C3G.

Syzygium Cumini L., commonly known as ‘jamun’ in India and other Asian countries, is a popularly consumed berry and is used in treating certain ailments such as diabetes mellitus [46]. Jamun pulp contains anthocyanins including glycosides of delphinidin, malvidin, cyanidin, petunidin and peonidin and a significant amount of ellagic acid (EA). Perhaps, this is the only berry that contains these five different anthocyanidins and EA [47]. The potential of jamun against 17β-estrogen-mediated BC and the role of miRNAs and other targets in suppressing BC were reported by Aqil et al. (2016) [48]. The results showed that jamun significantly offset estrogen-mediated alterations in mammary cell-proliferation, ER-α, cyclin D1 and candidate miRNAs. The modulation of these biomarkers correlated with a reduction in mammary carcinogenicity.

Phytochemical studies carried out using Juniperus taxa demonstrated the presence of a wide array of secondary metabolites with a variety of pharmacological effects [49]. De Marino et al. (2014) [50] reported the effects of crude n-butanol extract and its pure compounds 2, 3, 4 and 5 on three human cancer cell lines being MCF-7 one of them. The experiments showed that the compound 2 had effect on MCF-7 viability, exerted no significant increase of apoptosis and promoted the cell cycle arrest at G0/G1 phase when compared to untreated cells. Finally, compound 2 decreased Vascular Endothelial Growth Factor (VEGF) levels and other five pro-inflammatory cytokines suggesting its potential anti-inflammatory effect.

Zhang et al. (2015) [51] reported that an aqueous extract of berries of Pimenta dioica Allspice (AAE) was tested against human BC in vitro and in vivo. In vitro studies showed that AAE reduced the viability and clonogenic growth of several types of BC cells with limited toxicity to non-tumorigenic, quiescent cells. AAE induced cytotoxicity in BC cells was inconsistent with apoptosis, but was associated with increased levels of autophagy markers LC3B and LC3B-positive puncta. Further, AAE caused inhibition of Akt/mTOR signaling and showed enhanced cytotoxicity when combined with rapamycin, a chemotherapy drug and an inhibitor of mTOR signaling. With respect to in vivo studies, oral administration of AAE to athymic mice implanted with MDA-MB-231 tumors inhibited tumor growth slightly but not significantly when mice were gavaged post-tumor implant. However, tumor growth showed a significant delay in tumor palpability and growth rate when mice were pre-dosed with AAE for two weeks before tumor implant. Analysis of tumor tissues showed increased levels of LC3B in AAE-treated tumors, indicating elevated autophagic tumor cell death in vivo in AAE-treated mice.

Poha Berry (Physalis peruviana L.) originated in tropical South America. It has become naturalized and is found in the Island of Hawai‘i. The edible fruits are commonly known as cape gooseberry or poha in Hawai‘i. Chang et al. (2016) [52] reported three new withanolides, physaperuvin G (1), physaperuvins I-J (2-3), along with four known withanolides, namely 4β-hydroxywithanolide E (4), withaperuvin C (5), physalactone (6), and coagulin (7) were isolated from the aerial parts of P. peruviana. In addition, two known compounds phyperunolide F (8) and withanolide S (9) were isolated and identified from the poha berry fruits. Poha isolated compounds were evaluated for their growth inhibitory effects on MDA-MB-231 BC cells that harbor aberrantly-activated STAT3 compared to normal NIH-3T3 mouse fibroblasts [52].

Rubus fairholmianus is an unexplored berry in folkloric medicine. George et al. (2017) [53] investigated the importance of R. fairholmianus in pharmaceutical industry for the development of cost-effective cancer therapeutic drugs using in vitro and in vivo analysis. Chemical characterization, antioxidant, antiproliferative and proapoptotic properties of R. fairholmianus root methanolic column subfraction (RFM) were investigated. The solid and ascites tumors in mice were reduced significantly upon 100 mg/kg RFM treatment by reducing the tumor volume, tumor weight and prolonging life span. In vitro studies demonstrated that the morphological features of RFM treated MCF-7 cells showed cell damage and decreased cell numbers. Treated cells had a substantial decrease in cellular ATP proliferation, increase in LDH cytotoxicity, increase in apoptotic cell population and decrease in viable cell population. Increased caspase 3/7 activity and cytochrome c release were also observed in treated cells.

Phenolics, antioxidant and antiproliferative properties of Sea buckthorn berries were evaluated using a simulated in vitro digestion system and results were compared with a chemical extraction method [54]. Digested samples were subjected to antiproliferation evaluation against human liver, breast and colon cancer cells. Results revealed that after enzymatic digestion the phenolic compounds were quite different from the chemical extraction (more flavonoid aglycones were released, whereas less total phenolics, phenolic acids and flavonoid glycosides were detected). Although the extracellular antioxidant activity of the digested samples was lower than that of extracts, the cellular antioxidant activity and antiproliferative effects of berries were significantly enhanced by digestion. This was attributed to the higher flavonoid aglycone content and it could be verified by testing individual active compounds. The digested samples showed an almost 5-fold increase in cellular accumulative amount of isorhamnetin than pure isorhamnetin, which was attributed to the significant down regulation of the mRNA expression of efflux transporters Multidrug Resistance-Associated Protein 2 (MRP2) and P-glycoprotein (P-gp).

Solanum nigrum is a traditional Indian plant acclaimed for its medicinal properties since antiquity. Among all plant parts, fruit berries have shown to be the most pharmacologically active part. Khan et al. (2016) [55] characterized the bioactive principles of chloroform fraction of S. nigrum (CFSn) fruit berries using Gas Chromatography–Mass Spectrometry analysis. 29 different compounds belonging to different chemical classes (alkaloids, flavonoids, carbohydrates, glycosides, phytosterols, proteins, phenolic compounds and saponins) were identified. Among them, two novel phenolic compounds, benzoiisovanillin and syringic acid (4-hydroxy-3, 5-dimethoxybenzoic acid) were identified, which may be responsible for its pharmacological properties. The anticancer activity against BC cell lines (MDA-MB-231 and MCF-7) was investigated. Results indicated that CFSn exhibited significant antiproliferative activity against both BC cell lines due to the induction of cancer cell death through apoptosis.

Over the years, numerous studies have demonstrated the anti-proliferative effect of strawberry in several types of cancer cells, including BC cells. The biological effects of a polyphenol-rich strawberry extract (PRSE), obtained from the “Alba” variety was tested in highly aggressive and invasive basal-like BC cell line A17. Results showed that PRSE was able to decrease the cellular viability in time- and dose-dependent manner. Sub-lethal doses of PRSE induced the accumulation of cells in G1 phase of the cell cycle and inhibited cellular mobility. Gene expression analysis revealed the modulation of 12 genes playing different roles in the cellular migration, adhesion and invasion processes. Moreover, in vivo experiments showed the growth inhibition of A17 cells orthotopically transplanted in mouse mammary glands and fed PRSE [56]. A methanolic extract from strawberries of the “Alba” cultivar was also used to treat other two different BC cell lines, N202/1A (high levels of HER2/neu oncogene) and N202/1E (low levels of HER2/neu oncogene) for 24, 48 and 72 h. Results demonstrated a higher inhibition of cell proliferation after 48 and 72 h of treatment [57]. Therefore, these evidences support future in vivo investigations.

The genus Withania (Family: Solanaceae) holds an important position in Ayurveda, the Indian traditional system of medicine. Withania somnifera Dunal and Withania coagulans Dunal have been documented in folklore as panaceas for various ailments since time immemorial. W. coagulans (WC), commonly called Indian cheese maker, is used for fermenting milk for cheese production in various parts of India. Ahmad et al. (2017) [58] reported that methanolic extract of WC possessed apoptotic activity against MDA-MB-231 human BC cells in vitro although it was lower in comparison to W. somnifera and warrants further investigation.

2.3Synthesized plant-based nanoparticles or commercial extracts

Synthesized plant-based nanoparticles or commercial plant extracts have been tested for their possible chemotherapeutic/therapeutic properties against BC (Table 3). Biogenic [email protected] core-shell nanoparticles were greenly synthesized using two plant extracts with the focus to develop compounds that have enhanced anticancer/bactericidal functions [59]. A significant inhibition of cancer cell growth of MCF 7 BC cell line when it is compared to Wish normal cells. Doxorubicin was assessed as well. The findings showed that [email protected] was cytotoxic against MCF7 human BC cells. Therefore, the obtained biogenic core-shell nanoparticles (BCSnp) were proposed for cancer therapy with improved efficiency applying the nanomedicine approach. Tailorable properties can be obtained by tuning the individual structures.

Table 3

Effects of synthesized plant-based nanoparticles or commercial extracts on in vitro and/or in vivo models of breast cancer

Extracts/Fraction/ComponentExperimental modelDosage and duration of treatmentBiological response/involved pathwayRef.
[email protected] Core-shell nanoparticlesHuman breast cancer cell line MCF-7.0.1698, 0.3396, 0.6792, 1.3584 &2.7168 μg/ml of Almond [email protected]&Black Berry [email protected] for 72 h.-↓Cell growth.[59]
Aronox®55 healthy volunteers &47 invasive breast cancer.Blood from breast cancer patients and healthy volunteers was collected and immediately centrifuged (2000 g, 15 min) to get plasma.-↓Oxidative/nitrative stress in plasma after A. melanocarpa extract treatments.[60]
In other experiments, whole blood (from breast cancer patients and healthy volunteers) was also incubated for 15 min at 37°C with A. melanocarpa extract (50 μg/mL).

Aronox® is a rich source of phytochemicals that are responsible for the multifunctional biological actions of this extracts [60]. Dysregulation of ROS/reactive nitrogen specie (RNS) metabolism in cancer patients has been confirmed by investigations of several oxidative/nitrative stress markers in cancer cells, plasma and various blood cells. In 2013, Kędzierska et al. (2013) [60] assessed the effects of surgery and chemotherapy (combination of doxorubicin and cyclophosphamide) on oxidative/nitrative stress in plasma from BC patients. In vitro experiments were performed in the plasma from these BC patients treated with commercial extract of Aronia melanocarpa (black chokeberry; Aronox®). Results demonstrated that there was inhibitory action of A. melanocarpa extract on the oxidative/nitrative stress in plasma isolated from all tested patient groups, including patients after different phases of chemotherapy.

2.4General dietary patterns

Two human studies have been reported during the past five years trying to link berry intake and BC risk (Table 4). Link et al. (2013) [61] evaluated dietary patterns and their relationship to BC risk in a large cohort of woman subjects. Five predominant dietary patterns were identified using principal component factor analysis: (i) a plant-based diet (high in fruits and vegetables); (ii) a high-protein, high-fat diet (high in meats, eggs, fried foods, and high-fat condiments); (iii) a high-carbohydrate diet (high in convenient foods, pasta, and bread products); (iv) an ethnic diet (high in legumes, soy-based foods, rice, and dark-green leafy vegetables); and (v) a salad and wine diet (high in lettuce, fish, wine, low-fat salad dressing, and coffee and tea). The plant-based pattern was associated with a reduction in BC risk; risk reduction was greater for ER–PR–tumors. The salad and wine pattern was associated with an increased risk of estrogen ER+PR+ tumors; this effect was only slightly attenuated after adjustment for alcohol consumption. Fung et al. (2013) [62] examined the associations of specific fruits and vegetables with risk of ER–postmenopausal BC. Results showed that higher intake of berries and peaches was associated with lower risk of ER–BC among post-menopausal women. The multivariate relative risk (RR) for consuming every 2 servings/week for total berries was 0.82, the RR for women who consumed at least one serving of blueberries per week was 0.69 compared with non-consumers; and the RR for consuming at least 2 servings of peaches/nectarines per week was 0.59. Interesting, the risk of ER–BC was not associated with intakes of other specific fruits or vegetables. These results were considered exploratory and needed to be confirmed in further studies [62].

Table 4

General dietary patterns link berry intake with breast cancer risk in humans

PopulationDosage and duration of treatmentBiological response/involved pathwayRef.
91,779 women in the California Teachers Study cohort were analyzed (including data from 4140 women with a diagnosis of invasive breast cancer made between 1995 and 2009).16-page mailed questionnaire in 1995-1996. Five predominant dietary patterns were identified by using principal: plant-based; high-protein, high-fat; high-carbohydrate; ethnic; and salad and wine.Greater consumption of a plant-based dietary pattern is associated with a reduced breast cancer risk, particularly for ER- PR- tumors.[61]
75,929 women (38 to 63 years old at baseline).Dietary data were collected for up to 24 years (seven times during this period).Higher intake of berries and peaches was associated with lower risk of ER–breast cancer among post-menopausal women.[62]


The present work aimed to summarize the effects of different phenolic compounds or different phenolic extracts from berries in studies published during the past five years. Several in vitro and in vivo studies have demonstrated that the compounds present in berries play key roles in cancer prevention by inactivating carcinogens, decreasing cell proliferation, inducing cell cycle arrest and apoptosis, and inhibiting angiogenesis in many types of tumors.

Phenolic extracts from “newly-red fruits” specific from particular environments (such as, Goji berry and Jasmun) showed preventive and/or therapeutic potential for breast cancer. The possible mechanisms of their anticancer effects have been widely addressed.

Human studies addressed the importance of a plant-based pattern rich in fruits and vegetables and breast cancer risk reduction. Higher intake of berries and peaches was associated with lower risk of estrogen receptor–breast cancer among post-menopausal women. Anyway, future human studies are warranted to investigate the therapeutic potential of berries in humans.


Patricia Reboredo-Rodríguez acknowledges Xunta de Galicia her post-doctoral contract.



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