Brachyury, a vaccine target, is overexpressed in triple-negative breast cancer

Patients diagnosed with triple-negative breast cancer (TNBC) have a high rate of tumor metastasis and a poor prognosis. The treatment option for these patients is currently chemotherapy, which results in very low response rates. Strategies that exploit the immune system for the treatment of cancer have now shown the ability to improve survival in several tumor types. Identifying potential targets for immune therapeutic interventions is an important step in developing novel treatments for TNBC. In this study, in silico analysis of publicly available datasets and immunohistochemical analysis of primary and metastatic tumor biopsies from TNBC patients were conducted to evaluate the expression of the transcription factor brachyury, which is a driver of tumor metastasis and resistance and a target for cancer vaccine approaches. Analysis of breast cancer datasets demonstrated a predominant expression of brachyury mRNA in TNBC and in basal vs luminal or HER2 molecular breast cancer subtypes. At the protein level, variable levels of brachyury expression were detected both in primary and metastatic TNBC lesions. A strong association was observed between nuclear brachyury protein expression and the stage of disease, with nuclear brachyury being more predominant in metastatic vs primary tumors. Survival analysis also demonstrated an association between high levels of brachyury in the primary tumor and poor prognosis. Two brachyury-targeting cancer vaccines are currently undergoing clinical evaluation; the data presented here provide rationale for using brachyury-targeting immunotherapy approaches for the treatment of TNBC.

[Predictive variables of lymphatic metastasis in breast carcinoma with a diameter below 2 cm]

The axillary lymph node status of patients with newly diagnosed breast cancer remains the most important prognostic information available at the moment. However, only a minority of patients presents with such node metastases at diagnoses. We reviewed our database and studied 500 consecutive patients with early breast cancer, and found that age inferior to 50 years, high grade, diameter superior to 1 cm, elevated Ki-67, and expression of oncogene p-53 are all factors associated with lymph node metastases.

[Hormone-dependence and C-ERBB2: relationship between estrogen receptor expression, estrogen-regulated proteins, and C-ERBB2 in breast carcinoma]

We reviewed 1491 consecutive cases of operated breast cancer between 1999-2004, and found that hormone-dependence, particularly if evaluated with functional markers of the estrogen receptor (estrogen regulated proteins, ERP), is inversely proportional to antigen neu expression. Our data confirms that ERP can give additional information on the probability of response to hormonal therapy.

Optimisation of isolation of richly pure and homogeneous primary human colonic smooth muscle cells

BACKGROUND

Inherent properties of gastrointestinal smooth muscle can be assessed using isolated cell suspensions. Currently available isolation techniques, based on short 2-h enzymatic digestion, however, present the disadvantage of low cellular yield with brief viability. These features are an important limiting factor especially in studies in humans in which tissue may not be available daily and mixing of samples is not recommended.

AIMS

To optimise the isolation procedure of cells from human colon to obtain a richly pure primary smooth muscle cell preparation.

METHODS

Slices of circular muscle layer, obtained from surgical specimens of human colon, were incubated overnight in Dulbecco's modified eagle's medium supplemented with antibiotics, foetal bovine serum, an ATP-regenerating system and collagenase. On the following day, digested muscle strips were suspended in HEPES buffer, and spontaneously dissociated smooth muscle cells were harvested and used either immediately or maintained in suspension for up to 72 h. Cell yield, purity, viability, contractile responses, associated intracellular calcium signals and RNA and protein extraction were evaluated and compared to cell suspensions obtained with the current short digestion protocol.

RESULTS AND CONCLUSION

The overnight isolation protocol offers the advantage of obtaining a pure, homogeneous, long-life viable cell suspension that maintains a fully differentiated smooth muscle phenotype unchanged for at least 72 h and that allows multiple functional/biochemical studies and efficient RNA extraction from a single human specimen.