Chemistry: molecular biology and microbiology – Vector – per se
Reexamination Certificate
1998-10-27
2004-09-21
Canella, Karen A. (Department: 1642)
Chemistry: molecular biology and microbiology
Vector, per se
C435S252300, C435S254110, C435S325000, C536S023400, C536S023500
Reexamination Certificate
active
06794185
ABSTRACT:
1. INTRODUCTION
The present invention relates to methods and compositions for the diagnosis, prevention and treatment of tumor progression in mammals, for example, humans. The different types of tumors may include, but are not limited to, human melanomas, breast, gastrointestinal tumors such as esophageal, stomach, duodenal, colon, colorectal and rectal cancers, prostate, bladder, testicular, ovarian, uterine, cervical, brain, lung, bronchial, larynx, pharynx, liver, pancreatic, thyroid, bone, various types of skin cancers and neoplastic conditions such as leukemias and lymphomas. Specifically, genes which are differentially expressed in tumor cells relative to normal cells and/or relative to tumor cells at a different stage of tumor progression are identified. For example, genes are identified which are differentially expressed in benign (e.g., non-malignant) tumor cells relative to malignant tumor cells exhibiting a high metastatic potential. Genes are also identified via the ability of their gene products to interact with gene products involved in the progression to and/or aggressiveness of neoplastic tumor disease states. The genes identified can be used diagnostically or as targets for therapeutic intervention. In this regard, the present invention provides methods for the identification of compounds useful in the diagnosis, prevention and therapeutic treatment of tumor progression, including, for example, metastatic neoplastic disorders. The present invention also provides methods for the identification of compounds useful in the diagnosis, prevention and therapeutic treatment of tumor progression, including, for example, pre-neoplastic and/or benign states. Additionally, methods are provided for the diagnostic evaluation and prognosis of conditions involving tumor progression, for the identification of subjects exhibiting a predisposition to such conditions, for monitoring patients undergoing clinical evaluation for the prevention and treatment of tumor progression disorders, and for monitoring the efficacy of compounds used in clinical trials.
2. BACKGROUND OF THE INVENTION
Cancer is the second leading cause of death in the United States, after heart disease (Boring, C. C. et al., 1993, CA Cancer J. Clin. 43:7), and develops in one in three Americans, and one of every four Americans dies of cancer. Cancer is characterized primarily by an increase in the number of abnormal, or neoplastic, cells derived from a given normal tissue which proliferate to form a tumor mass, the invasion of adjacent tissues by these neoplastic tumor cells, and the generation of malignant cells which spread via the blood or lymphatic system to regional lymph nodes and to distant sites. The latter progression to malignancy is referred to as metastasis.
Cancer can be viewed as a breakdown in the communication between tumor cells and their environment, including their normal neighboring cells. Signals, both growth-stimulatory and growth-inhibitory, are routinely exchanged between cells within a tissue. Normally, cells do not divide in the absence of stimulatory signals, and, likewise, will cease dividing in the presence of inhibitory signals. In a cancerous, or neoplastic, state, a cell acquires the ability to “override” these signals and to proliferate under conditions in which normal cells would not grow.
Tumor cells must acquire a number of distinct aberrant traits to proliferate. Reflecting this requirement is the fact that the genomes of certain well-studied tumors carry several different independently altered genes, including activated oncogenes and inactivated tumor suppressor genes. Each of these genetic changes appears to be responsible for imparting some of the traits that, in aggregate, represent the full neoplastic phenotype (Land, H. et al., 1983, Science 222:771; Ruley, H. E., 1983, Nature 304:602; Hunter, T., 1991, Cell 64:249).
In addition to unhindered cell proliferation, cells must acquire several traits for tumor progression to occur. For example, early on in tumor progression, cells must evade the host immune system. Further, as tumor mass increases, the tumor must acquire vasculature to supply nourishment and remove metabolic waste. Additionally, cells must acquire an ability to invade adjacent tissue, and, ultimately, cells often acquire the capacity to metastasize to distant sites.
The biochemical basis for immune recognition of tumor cells is unclear. It is possible that the tumorigenicity of cells can increase when the cells' display of Class I histocompatability antigens is reduced (Schrier, P. I. et al., 1983, Nature 305:771), in that these antigens, in conjunction with tumor-specific antigens are required for the tumor cells to be recognized by cytotoxic T lymphocytes (CTLs). Tumor cells which have lost one or more genes encoding tumor-specific antigens seem to escape recognition by the corresponding reactive CTLs (Van der Bruggen, P. et al., 1991, Science 254:1643).
Once a tumor reaches more than about 1 mm in diameter, it can no longer rely on passive diffusion for nutrition and removal of metabolic waste. At this point, the tumor mass must make intimate contact with the circulatory system. Thus, cells within more advanced tumors secrete angiogenic factors which promote neovascularization, i.e., the growth of blood vessels from surrounding tissue into the tumor mass (Folkman, J. and Klagsburn, M., 1987, Science 235:442; Liotta, L. A. et al., 1991, Cell 64:327). Among these angiogenic factors are the fibroblast growth factor (FGF) and endothelial cell growth factor (ECGF). Neovascularization can, in fact, be an essential precursor to metastasis. First, the process is required for a large increase in tumor cell number, which in turn, allows the appearance of rare metastatic variants. Further, neovascularization provides a direct portal entry into the circulatory system which can be used by metastasizing cells.
A variety of biochemical factors have been associated with different phases of metastases. Cell surface receptors for collagen, glycoproteins such as laminin, or proteoglycans, facilitate tumor cell attachment, an important step in invasion and metastases. Attachment then triggers the release of degradative enzymes which facilitate the penetration of tumor cells through tissue barriers. Once the tumor cell has entered the target tissue, specific growth factors are required for further proliferation.
It is apparent that the complex process of tumor progression must involve multiple gene products. It is therefore important to define the role of specific genes involved in tumor progression, to identify those gene products involved in the tumor progression process and to further identify those gene products which can serve as therapeutic targets for the diagnosis, prevention and treatment of metastases of various forms of cancers.
Some attempts have been made to study genes which are thought to elicit or augment tumor progression phenotypes. Mutations may drive a wave of cellular multiplication associated with gradual increases in tumor size, disorganization and malignancy. For example, a mutation in the tumor suppressor gene which is a negative regulator of cellular proliferation, results in a loss of crucial control over tumor growth and progression. Differential expression of the following suppressor genes has been demonstrated in human cancers: the retinoblastoma gene, RB; the Wilms' tumor gene, WT1 (11p); the gene deleted in colon carcinoma, BCC (18q); the neurofibromatosis type 1 gene, NF1 (17q); and the gene involved in familial adenomatous polyposis
coli
, APC (5q) (Vogelstein, B. and Kinzler, K. W., 1993, Trends Genet. 9:138-141).
Insight into the complex events that lead from normal cellular growth to neoplasia, invasion and metastasis is crucial for the development of effective diagnostic and therapeutic strategies. The foregoing studies are aimed at defining the role of particular gene products presumed to be involved in tumor progression. However, such approaches cannot identify the full panoply of gene products that are involved in the cascad
Canella Karen A.
Fish & Richardson P.C.
Millennium Pharmaceuticals Inc.
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