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1999:
Toyama T; Iwase H; Watson P; Muzik H; Saettler E; Magliocco A; DiFrancesco L; Forsyth P; Garkavtsev I; Kobayashi S; Riabowol K
Suppression of ING1 expression in sporadic breast cancer.
Oncogene 1999;
18(
37):.
Down regulation of the ING1 candidate tumour suppressor promotes growth in soft agar and focus formation in vitro and tumour formation in vivo. ING1 encodes a nuclear, cell cycle-regulated protein, overexpression of which efficiently blocks cell growth and is capable of inducing apoptosis in different experimental systems. Here we present the first report of ING1 mutation and expression analysis in a total of 452 cancer samples. One germline missense alteration and three germline silent alterations were detected in 377 primary breast cancers while marked (2 - 10-fold) decreases in ING1 mRNA expression were seen in 44% of primary breast cancers and in ten of ten breast cancer cell lines examined. Furthermore, the majority of breast cancers (58%) showing decreased ING1 expression had metastasized to regional lymph nodes whereas only 9% of cancers with elevated ING1 expression, compared to adjacent normal tissues, were metastatic. Thus, ING1 mutation is very rare in breast or ovarian cancers, however, repression of ING1 expression frequently accompanies tumour development of breast cancer.
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