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Over-expression is also known to occur in ovarian, [19] stomach, adenocarcinoma of the lung [20] and aggressive forms of uterine cancer, such as uterine serous endometrial carcinoma, [21] [22] e.g. HER2 is over-expressed in approximately 7-34% of patients with gastric cancer [23] [24] and in 30% of salivary duct carcinomas.
The epidermal growth factor receptor is a member of the ErbB family of receptors, a subfamily of four closely related receptor tyrosine kinases: EGFR (ErbB-1), HER2/neu (ErbB-2), Her 3 (ErbB-3) and Her 4 (ErbB-4). In many cancer types, mutations affecting EGFR expression or activity could result in cancer. [6]
Panitumumab efficacy has been tested in a variety of advanced cancer patients, including renal carcinomas and metastatic colorectal cancer in clinical trials. [28] ErbB2 overexpression can occur in breast, ovarian, bladder, non-small-cell lung carcinoma, as well as several other tumor types. [28]
As some technologies such as RNA-seq can provide the entire transcriptome of individual, the mRNA-based disease diagnosis can be developed in the landscape of personalized medicine. In HER-2 breast cancer, detection of ERBB2 mRNA expression levels is helpful in predicting response to anti-HER2-based treatments. [22]
Lung cancer is the second most common type of cancer and leading cause of death in men and women in the United States, it is estimated that there is about 216,000 new cases and 160,000 deaths due to lung cancer. [116] Initiation and progression of lung carcinoma is the result of the interaction between genetic, epigenetic and environmental factors.
The human ERBB3 gene is located on the long arm of chromosome 12 (12q13). It is encoded by 23,651 base pairs and translates into 1342 amino acids. [5]During human development, ERBB3 is expressed in skin, bone, muscle, nervous system, heart, lungs, and intestinal epithelium. [6]
Another remaining question surrounding CDK inhibitors as a therapy is if certain cancers will evade or be resistant to treatment. One study showed that 20% of the patients being treated for metastatic ER+ HER2-breast cancer did not respond at all to treatment with a CDK4/6 inhibitor due to preexisting mutations allowing the cancer cells to continue proliferating despite treatment with the drug ...
Another line of therapeutics used for treating breast cancer is targeting of kinases like human epidermal growth factor receptor 2 (HER2) from the EGFR family. Mutations often occur in the HER2 gene upon treatment with an inhibitor, with about 50% of patients with lung cancer found to have an EGFR-T790M gatekeeper mutation. [12]
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