The purpose of this study was to classify breast carcinomas based on variations in gene expression patterns derived from cDNA microarrays and to correlate tumor characteristics to clinical outcome. A total of 85 cDNA microarray experiments representing 78 cancers, three fibroadenomas, and four normal breast tissues were analyzed by hierarchical clustering. As reported previously, the cancers could be classified into a basal epithelial-like group, an ERBB2-overexpressing group and a normal breast-like group based on variations in gene expression. A novel finding was that the previously characterized luminal epithelial/estrogen receptor-positive group could be divided into at least two subgroups, each with a distinctive expression profile. These subtypes proved to be reasonably robust by clustering using two different gene sets: first, a set of 456 cDNA clones previously selected to reflect intrinsic properties of the tumors and, second, a gene set that highly correlated with patient outcome. Survival analyses on a subcohort of patients with locally advanced breast cancer uniformly treated in a prospective study showed significantly different outcomes for the patients belonging to the various groups, including a poor prognosis for the basal-like subtype and a significant difference in outcome for the two estrogen receptor-positive groups.

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Gene expression patterns of breast carcinomas distinguish tumor subclasses with clinical implications

Breast cancer patients with the same stage of disease can have markedly different treatment responses and overall outcome. The strongest predictors for metastases (for example, lymph node status and histological grade) fail to classify accurately breast tumours according to their clinical behaviour. Chemotherapy or hormonal therapy reduces the risk of distant metastases by approximately one-third; however, 70-80% of patients receiving this treatment would have survived without it. None of the signatures of breast cancer gene expression reported to date allow for patient-tailored therapy strategies. Here we used DNA microarray analysis on primary breast tumours of 117 young patients, and applied supervised classification to identify a gene expression signature strongly predictive of a short interval to distant metastases ('poor prognosis' signature) in patients without tumour cells in local lymph nodes at diagnosis (lymph node negative). In addition, we established a signature that identifies tumours of BRCA1 carriers. The poor prognosis signature consists of genes regulating cell cycle, invasion, metastasis and angiogenesis. This gene expression profile will outperform all currently used clinical parameters in predicting disease outcome. Our findings provide a strategy to select patients who would benefit from adjuvant therapy.

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Gene expression profiling predicts clinical outcome of breast cancer

Background A more accurate means of prognostication in breast cancer will improve the selection of patients for adjuvant systemic therapy. Methods Using microarray analysis to evaluate our previously established 70-gene prognosis profile, we classified a series of 295 consecutive patients with primary breast carcinomas as having a gene-expression signature associated with either a poor prognosis or a good prognosis. All patients had stage I or II breast cancer and were younger than 53 years old; 151 had lymph-node–negative disease, and 144 had lymph-node–positive disease. We evaluated the predictive power of the prognosis profile using univariable and multivariable statistical analyses. Results Among the 295 patients, 180 had a poor-prognosis signature and 115 had a good-prognosis signature, and the mean (±SE) overall 10-year survival rates were 54.6±4.4 percent and 94.5±2.6 percent, respectively. At 10 years, the probability of remaining free of distant metastases was 50.6±4.5 percent in the group with a...

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A Gene-Expression Signature as a Predictor of Survival in Breast Cancer

background The likelihood of distant recurrence in patients with breast cancer who have no involved lymph nodes and estrogen-receptor–positive tumors is poorly defined by clinical and histopathological measures. methods We tested whether the results of a reverse-transcriptase–polymerase-chain-reaction (RT-PCR) assay of 21 prospectively selected genes in paraffin-embedded tumor tissue would correlate with the likelihood of distant recurrence in patients with node-negative, tamoxifen-treated breast cancer who were enrolled in the National Surgical Adjuvant Breast and Bowel Project clinical trial B-14. The levels of expression of 16 cancerrelated genes and 5 reference genes were used in a prospectively defined algorithm to calculate a recurrence score and to determine a risk group (low, intermediate, or high) for each patient. results Adequate RT-PCR profiles were obtained in 668 of 675 tumor blocks. The proportions of patients categorized as having a low, intermediate, or high risk by the RT-PCR assay were 51, 22, and 27 percent, respectively. The Kaplan–Meier estimates of the rates of distant recurrence at 10 years in the low-risk, intermediate-risk, and high-risk groups were 6.8 percent (95 percent confidence interval, 4.0 to 9.6), 14.3 percent (95 percent confidence interval, 8.3 to 20.3), and 30.5 percent (95 percent confidence interval, 23.6 to 37.4). The rate in the low-risk group was significantly lower than that in the high-risk group (P<0.001). In a multivariate Cox model, the recurrence score provided significant predictive power that was independent of age and tumor size (P<0.001). The recurrence score was also predictive of overall survival (P<0.001) and could be used as a continuous function to predict distant recurrence in individual patients. conclusions The recurrence score has been validated as quantifying the likelihood of distant recurrence in tamoxifen-treated patients with node-negative, estrogen-receptor–positive breast cancer.

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A Multigene Assay to Predict Recurrence of Tamoxifen-Treated, Node-Negative Breast Cancer

Morphological assessment of the degree of differentiation has been shown in numerous studies to provide useful prognostic information in breast cancer, but until recently histological grading has not been accepted as a routine procedure, mainly because of perceived problems with reproducibility and consistency. In the Nottingham/Tenovus Primary Breast Cancer Study the most commonly used method, described by Bloom & Richardson, has been modified in order to make the criteria more objective. The revised technique involves semiquantitative evaluation of three morphological features--the percentage of tubule formation, the degree of nuclear pleomorphism and an accurate mitotic count using a defined field area. A numerical scoring system is used and the overall grade is derived from a summation of individual scores for the three variables: three grades of differentiation are used. Since 1973, over 2200 patients with primary operable breast cancer have been entered into a study of multiple prognostic factors. Histological grade, assessed in 1831 patients, shows a very strong correlation with prognosis; patients with grade I tumours have a significantly better survival than those with grade II and III tumours (P less than 0.0001). These results demonstrate that this method for histological grading provides important prognostic information and, if the grading protocol is followed consistently, reproducible results can be obtained. Histological grade forms part of the multifactorial Nottingham prognostic index, together with tumour size and lymph node stage, which is used to stratify individual patients for appropriate therapy.

Pathological prognostic factors in breast cancer. I. The value of histological grade in breast cancer: experience from a large study with long-term follow-up.

The background to the Halstedian era of breast cancer treatment is sketched, and the development of the changes in surgical treatment are outlined, with a review of the most important findings from the several clinical trials conducted to evaluate the alternative operative procedures. Included is a short description of operative techniques; also pathological examination of the operation specimen, and the use of radiation therapy when performing a segmental mastectomy are briefly described. This review is based almost entirely on observations from clinical trials conducted by the National Surgical Adjuvant Breast and Bowel Project.

Surgical treatment of primary breast cancer.

Increasing evidence is accumulating from animal model systems (J. C. Fisher et al., 1970; Halpern et al., 1966; Smith and Scott, 1972; Woodruff and Boak, 1966) and from studies in patients (Israel, 1973; Israel and Halpern, 1972; Israel and Edelstein, 1973), to suggest that various strains of anaerobic coryneforms are capable of tumor-growth inhibition. Mice harboring an array of experimental tumors have received Corynebacterium parvum as the only form of therapy by various routes and at a multiplicity of times. Although the experimental models varied greatly, there were certain conditions in which C. parvum afforded a degree of host protection. All investigators have reported that growth of tumors was more readily inhibited when C. parvum was administered to mice prior to, at, or shortly after tumor-cell inoculation. Practically no evidence has been presented to demonstrate its effectiveness when given to mice with established, visible, palpable, or measurable tumors.

Results of Investigations with Corynebacterium parvum in an Experimental Animal System

Ever since Schiff (1884) 1 inserted homologous thyroid glands into the peritoneal cavity of dogs, several generations of laboratory investigators and surgeons have reported their findings following implantation of this gland. It has been placed as a free graft into the subcutaneous tissue and abdominal musculature of guinea pigs, 2-4 the anterior chamber of the guinea pig, 4 adult dog and rabbit eye, 5 into different parts of the body of rabbits of various ages, 6 rats, 4,7-10 cats, 11 and dogs, 12,13 all under a variety of experimental conditions. In recent years implantation using the Millipore chamber technique has received attention. 14-16 The human, subsequent to Kocher's first implantations (1908) 17 in patients with thyroid deficiency, has also been a repeated recipient. 18-23 Generated by clinical urgency, homografting of the parathyroid has perhaps received even more attention. In the laboratory the observations of Camus (1905) 24 in the rabbit,

Bernard Fisher

Papers

Surgical treatment of primary breast cancer.

Results of Investigations with Corynebacterium parvum in an Experimental Animal System

Thyroparathyroid homotransplantation by vascular anastomosis. effect of immunosuppressive drugs.

Serum growth factor following primary tumor removal and the inhibition of its production by preoperative therapy

Impact of randomized clinical trials on therapy of primary breast cancer: The NSABP overview