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Table 1 Studies of interest presenting tumoral circulating proteins in plasma and serum of patients with breast cancer

From: Circulating proteins as predictive and prognostic biomarkers in breast cancer

Protein

Function

Studied population

Number of patients

Clinical association with elevated blood levels

Refs

VEGF

Angiogenesis factor

BC

44

Poor disease progression and late clinical stages

[96]

Metastatic BC

253

Poor clinical outcome and poor overall survival

[75]

TNBC

21

At baseline, associated with a good overall survival (10.2 months vs 4.2 months in the low levels group)

[99]

TNBC, non-TNBC and healthy participants

43 (TNBC)

53 (non-TNBC)

20 (healthy participants)

Worse response to NAC, metastasis and a poorer OS (median OS around 22 months)

[63]

TNBC

303

Unfavourable outcome (3-year DFS of 53% vs 85% with low serum VEGF levels)

[100]

TGF β

Cytokine controlling proliferation

BC and healthy particpants

44

Advanced stages

[61]

BC

60

Advanced stages

[62]

TNBC

43

High incidence of metastasis, relapse, and poor response to NAC

[63]

TNBC

48

TGF-β-related proteins were associated with TNBC tumour progression and poor outcomes

[64]

oesophageal adenocarcinoma

NA

TGF-β serum levels in metastatic patients were significantly higher compared to patients with non-metastatic disease

[65]

MMP9

Endopeptidase involved in the degradation of extracellular matrix

BC and benign breast disease

77 (BC)

10 (benign)

Higher in the breast cancer group compared to the benign tumour group

[91]

Metastatic BC and BC

88 (M +)

160 (M0)

Prognostic factor

[72]

TNBC

303

High levels correlated with a decrease in pCR rate and a poor response to NAC

[93]

HER2

Involved in the regulation of cell proliferation

BC

118

Elevated preoperative correlated with a worse prognosis

[69]

HER2 + M + BC

537

Short PFS

[70]

BC

64

Poor outcomes

[71]

Metastatic BC and BC

88 (M +)

160 (M0)

Appearance of brain metastasis

[72]

TIMP-1

Matrix metalloproteinases inhibitor

Metastatic BC

253

Poor PFS and OS

[74]

BC

60

Elevated serum levels associated with lower progression-free and OS rates

[76]

HER2 + M + BC

472

TIMP-1 levels described as prognostic factor of shorter PFS

[70]

TIE1/2 and Ang-2

Promotes angiogenesis

BC and healthy participants

143 (BC)

100 (healthy patients)

Ang-2 was higher in BC than in the healthy group and was associated with a worse OS and metastasis

[106]

BC and benign breast disease

127 (BC)

38 (benign breast disease)

Ang-2 was higher in BC than in the benign breast disease group

[107]

M + BC

181

High Ang-2 levels at baseline associated with poor PFS. Both Ang-2 and serum Tie2 appeared as prognostic factors of poor OS

[108]

M + BC

58

Good prognostic value, short median OS (around 20 months) and short median PFS

[109]

HP

Captures haemoglobin during haemolysis and inhibits oxidative activity

BC

6606

Poor clinical outcomes

[113]

TNBC and healthy participants

41 (TNBC)

10 (healthy patients)

Poor prognosis and low survival rate

[114]

TNBC and non-TNBC

30 (TNBC)

30 (non-TNBC)

High expression in TNBC group compared to non-TNBC group

[115]

CA15-3 and CEA

Prognostic markers for BC

TNBC

247

Elevated CEA and CA15-3 levels associated with short OS and DFS rates

[118]

TNBC

604

High risk of death

[119]

VE-cadherin

Plays a crucial role in endothelial adherens junction assembly and maintenance

BC

48

Predictive factor for recurrence

[83]

Hormone-resistant M + BC

141

Prognostic factor for both PFS and OS

[84]

HGF

Involved in morphogenesis, cell and tissue survival, and cellular growth

BC

134

Appearance of metastases

[78]

BC

34

Poor prognosis and a high risk of progression

[79]

BC

121

Metastasis

[80]

IGF-I and PDGF

Regulator of growth, survival, migration and invasion

TNBC, non-TNBC and healthy participants

43 (TNBC)

53 (non-TNBC)

20 (healthy participants)

Metastasis and recurrence

[63]

BC

110

Associated with high serum PDGF levels, IGF-I may increase this risk of recurrence

[110]

LRP6N

Co-receptor for Wnt signal induction

BC

295

Diagnostic marker for the early detection of breast cancer metastasis

[77]

PD1/PDL1

Immune checkpoints

TNBC

66

Predictive factors of treatment response

[132]

HER2 + M + BC

387

High serum PDL1 level before treatment strongly linked to longer OS in the lapatinib group compared to the trastuzumab group

[133]

M + BC

208

Short PFS of metastatic breast cancer and a poor prognosis

[134]

  1. Ang2: Angiopoietin 2, ApoC-I: Apolipoprotein I-C, BC: Breast cancer, CA15-3: Cancer antigen 15–3, CEA: Carcinoembryonic antigen, ELISA: Enzyme-linked immunosorbent assay, HER2: Human epidermal growth factor receptor 2, HGF: Hepatocyte growth factor, HP: Haptoglobin, IGF: Insulin-like growth factor, LRP6N: LRP6 ectodomain, MMP9: Matrix metalloproteinase 9, M + : metastatic, NAC: Neoadjuvant chemotherapy, OS: Overall survival, pCR: pathological complete response, PDGF: Platelet-derived growth factor, PD1: Programmed cell death protein 1, PDL1: Programme death ligand 1, PFS: Progression free survival, TGF β: Transforming growth factor β, Tie-1/2: Tyrosine kinase with immunoglobulin and epidermal growth factor-homology domains ½, TIMP-1: Tissue inhibitor of metalloproteinase 1, TNBC: Triple negative breast cancer, VEGF: Vascular endothelial growth factor