Pseudoangiomatous Stromal Hyperplasia on Core Needle Biopsy Does Not Require Surgical Excision.

Pseudoangiomatous stromal hyperplasia (PASH) is an uncommon, benign localized fibrotic lesion. Historically, PASH has been difficult to differentiate from angiosarcoma. This difficulty has led to recommendations of surgical excision.

MEK1-RSK2 contributes to Hedgehog signaling by stabilizing GLI2 transcription factor and inhibiting ubiquitination.

The transcription factor GLI2 has an important role in the transduction of Hedgehog signaling and thereby regulates tumorigenesis in a wide variety of human tumors. However, the mechanisms controlling GLI2 protein expression and stabilization are incompletely understood. In this study, we show that the mitogen-activated protein kinase MEK1 modulates GLI2 both at the mRNA and protein level.

Basic helix-loop-helix transcription factor Twist1 inhibits transactivator function of master chondrogenic regulator Sox9.

Canonical Wnt signaling strongly inhibits chondrogenesis. Previously, we identified Twist1 as a critical downstream mediator of Wnt in repression of chondrocyte differentiation. However, the mechanistic basis for the antichondrogenic activity of Twist1 has not heretofore been established.

N-cadherin adherens junctions mediate osteogenesis through PI3K signaling.

During endochondral ossification, the cartilage is surrounded by a layer of cells that constitute the perichondrium. Communication between osteoblasts in the perichondrium via N-cadherin adherens junctions is essential for endochondral bone growth. We observed that adherens junction molecule N-cadherin and its interacting partners p120, β-catenin and PTEN are expressed by cells present in the perichondrium.

A prospective randomised study of a rotary powered device (OnControl) for bone marrow aspiration and biopsy.

Introduction: Bone marrow aspiration and biopsy is an invasive procedure associated with morbidity and mortality risk. We compared a powered bone marrow aspiration and biopsy device to the traditional method by relatively assessing pain scores, procedure times, biopsy capture rates, quality of material retrieved, and safety and operator satisfaction.

Methods: Two large academic medical centres participated in this trial.