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- W2000745767 abstract "Protein tyrosine phosphatases that act in different cellular pathways are described most commonly as tumor suppressors, but also as oncogenes. Their role has previously been described in colorectal cancer, as well as in gastric, breast, thyroid, prostate, ovarian, pancreatic, glioma, liver, leukemia and many other cancers. In a previous study, we have described protein tyrosine phosphatase receptor type T, M, Z1 and Q genes (PTPRT, PTPRM, PTPRZ1 and PTPRQ) hypermethylated in sporadic colorectal cancer. Thus, in this study, we examined the relation of unbalanced chromosomal alterations within regions covering these four protein tyrosine phosphatase genes with this cancer. One hundred and two cancer tissues were molecularly characterized, including analysis of the BRAF and K-ras mutations and methylator phenotype. The analysis of chromosomal aberrations was performed using Comparative Genomic Hybridization. We observed amplification of three regions containing genes coding for PTPs, such as PTPRZ1 (7q31.3, amplified in 23.5% of cases), PTPRQ (12q21.2, amplified in 5.9% of cases), PTPRT (20q12, amplified in 29.4% of cases), along with deletions in the region of PTPRM (18p11.2, deleted in 21.6% of cases). These data may suggest that in sporadic colorectal cancer PTPRZ1, PTPRT, PTPRQ probably act as oncogenes, while PTPRM acts as a tumor suppressor gene. Our study also revealed that gains on chromosome 20q12 and losses on chromosome 18p11.2 are connected with the absence of the BRAF mutation and the conventional adenocarcinoma pathway." @default.
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- W2000745767 date "2014-12-01" @default.
- W2000745767 modified "2023-10-01" @default.
- W2000745767 title "Copy number alterations of chromosomal regions enclosing protein tyrosine phosphatase receptor-like genes in colorectal cancer" @default.
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- W2000745767 doi "https://doi.org/10.1016/j.prp.2014.07.010" @default.
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