Proliferation and Cdk4 expression in microsatellite unstable colon cancers with TGFBR2 mutations.

Approximately 15% of human colon cancers have microsatellite instability (MSI) and carry frameshift mutations in a polyadenine tract (BAT-RII) in the type II transforming growth factor beta (TGF-beta) receptor (TGFBR2), a required component of the TGF-beta receptor. The BAT-RII mutations in MSI colon cancers make the tumors resistant to the effects of TGF-beta. In cultured epithelial cells, TGF-beta can inhibit cell proliferation and induce apoptosis, and in vitro it can regulate the expression of a variety of cyclins, cyclin-dependent kinases (cdks) and cdk inhibitors.

Assent observed: children's involvement in leukemia treatment and research discussions.

Objective: Assent is a critical issue in pediatric ethics that has not been well-studied. We examined the role of older children in discussing a recent diagnosis of acute leukemia and treatment options, including participation in a randomized, clinical trial (RCT).

Design: Our sample was drawn from data collected as part of a larger, National Cancer Institute-funded study in which we observed, tape-recorded, and transcribed the informed consent conference (ICC) for children with leukemia at 6 institutions.

HLTF gene silencing in human colon cancer.

Chromatin remodeling enzymes are increasingly implicated in a variety of important cellular functions. Various components of chromatin remodeling complexes, including several members of the SWI/SNF family, have been shown to be disrupted in cancer. In this study we identified as a target for gene inactivation in colon cancer the gene for helicase-like transcription factor (HLTF), a SWI/SNF family protein.