SOLITARY PLASMACYTOMA OF BONE AND EXTRAMEDULLARY PLASMACYTOMA

Among plasma cell disorders, solitary plasmacytoma (solitany-plasmacytoma of bone, SPB and extramedullary plasmacytoma, EMP) is rare as compared with mulitiple myeloma (MM). Furthermore.the relationship between solitary plasmacytoma and MM remains unclear.Between 1960 and 1994, 24 patients with SPB and 20 with EMP were treated. The criteria for diagonosis were: (1) No evidence of other lesions based on clinical and radiologic examinations;(2) Biopsy evidence of a plasma cell neoplasm; (3) Bone marrow biopsy specimen with negative findings (less than 10% plasma cell); (4) No anemia, hypercalcemia or renal involvement. The average follow-up period was 112 months (from 6 to 360 months). Fifty-four percent of patients with SPB and 40% of patients with EMP developed MM, however, there was no significant statistical difference between SPB and EMP (P <0.05).We suggested that solitary plasmacytomas be classified as two types, latent and aggressive. The former was histologically well-differentiated plasmacytomas. The latter was poorly differentiated tumors which easily progress to MM. The treatment of choice is wide excision or thorough curettage, by cryogenic necrosis with liquid nitrogen or cautery of the bony wall with phenol and the cavity filled with bone grafts or cement. All patients with apparently isolated plasmacytoma should he given if the tumor turns out to be poorly differentiated, in order to delay their progression to MM.

Primary malignant bone tumors incidence,mortality,and trends in China from 2000 to 2015

Background:Primary malignant bone tumors are uncommon,and their epidemiological features are rarely reported.We aimed to study the incidence and death characteristics of bone tumors from 2000 to 2015.Methods:Population-based cancer registries submitted registry data to National Central Cancer Registry of China(NCCRC).The data collected from 501 local cancer registries in China were assessed using NCCRC screening methods and criteria.Incidence and mortality rates of primary bone tumor were stratified by age group,gender,and area.Age-standardized incidence and mortality rates were adjusted using the Chinese standard population in 2000 and Segi’s world population.The annual percentage change(APC)in rate was calculated using the Joinpoint Regression Program.Results:Data from 368 registries met quality control criteria,of which 134 and 234 were from urban and rural areas,respectively.The data covered 309,553,499 persons.The crude incidence,age-standardized incidence,and crude mortality rates were 1.77,1.35,and 1.31 per 100,000,respectively.Incidence and mortality rates were higher in males than those in females;they showed downward trends,with declines of 2.2%and 4.8%per year,respectively,and the rates in urban areas were lower than those in rural areas.Significant declining trends were observed in urban areas.Stable trends were seen in rural areas during 2000 to 2007,followed by downward trends.Age-specific incidence and mortality rates showed stable trends in the age group of 0 to 19 years,and downward trends in the age group elder than 19 years.Conclusions:The incidence and mortality rates of primary malignant bone tumors in rural areas were higher compared to those in urban areas.Targeted prevention measures are required to monitor and control bone tumor incidence and improve the quality of life of affected patients.This research can provide a scientific basis for the prevention and control of bone tumors,as well as basic information for follow-up research.

Traumatic giant cell tumor of rib: A case report

BACKGROUND Giant cell tumor(GCT)of the anterior rib origin is extremely rare.We report the first case of trauma-induced GCT of the rib.CASE SUMMARY A 22-year-old female developed a mass over the right anterior chest wall with pain 3 mo after a falling injury with blunt trauma of the right chest wall.Chest computed tomography(CT)showed a tumor originating from the right 6th rib with bony destruction,and a CT-guided needle biopsy revealed a GCT.We completely resected the tumor with chest wall and performed reconstruction.The pathological diagnosis was GCT of the bone.Twelve months after surgery,no signs of recurrence were observed.CONCLUSION GCT of the rib after trauma has not been reported.Meticulous history-taking and image evaluation are essential for the differential diagnosis of unusual chest wall tumors.

Yanghe decoction(阳和汤)attenuated pain hypersensitivity induced by michigan cancer foundation-7 injection in rats with bone metastases from breast cancer by inhibiting transient receptor potential ankyrin 1

OBJECTIVE:To study the effect and underlying mechanisms of Chinese medicine Yanghe decoction(阳和汤)on pain relief in a rat model of bone metastasis of breast cancer induced by michigan cancer foundation-7(MCF-7).METHODS:Bone pain was induced in the tibia of rats injected with MCF-7 cells.The Chinese herbal remedy was used to decoct Yanghe decoction for the treatment of bone pain rats.The behavior study was carried out to evaluate the paw mechanical withdraw threshold and thermal withdraw latency.Liquid chromatography-mass spectrometry,Western blotting,quantitative real-time polymerase chain reaction,enzyme-linked immunosorbent assay(ELISA),immunohistochemical(IHC)staining were performed for analysis.RESULTS:Yanghe decoction could improve the defensive behavior similar to the transient receptor potential ankyrin 1(TRPA1)inhibitor.In morphology study,Yanghe decoction could attenuate the cellular growth as well as inflammatory infiltration in the metastasis group.Furthermore,Yanghe decoction downregulated the TRPA1 expression on the dorsal root ganglion from the metastatic rats at both transcriptional and protein level.Yanghe decoction alleviated the inflammation in metastatic tissues by hematoxylin-eosin and IHC analysis,and Yanghe decoction also reduced the inflammatory cytokines production in the serum including tumor necrosis factor-αand interleukin-6,interleukin-1 beta by ELISA.As the cytochromec oxidase subunit II/prostaglandin E2(PGE2)is required for cancer development,Yanghe decoction reduced the expression of PGE2 in the tissue and serum.CONCLUSION:Taken together,Yanghe decoction protected the rats from breast cancer bone metastasis through TRPA1 signaling mediated neuropathic pain and additional immune modulation in tumor microenvironment.

Tumor blood vessels formation in osteosarcoma:vasculogenesis mimicry

BACKGROUND: Osteosarcoma is characterized by high neovascularization and a high propensity for metastasis through bloodstream. This study was to examine whether there is evidence for vasculogenic mimicry in osteosarcoma and to illustrate mechanism of tumor blood vessels formation in osteosarcoma. METHODS: Osteosarcoma cell lines (U-2OS) were tested for their ability to form tubular networks in three-dimensional culture containing type I collagen. The structures of the tubular networks were observed with phase contrast microscope and transmission electron microscope (TEM). Morphometric studies using hematoxylin and eosin (HE) stain and CD31 immunohistochemical stain to show tumor-lined channels in human osteosarcoma were also performed. RESULTS: Observation with light microscope and TEM showed that highly aggressive osteosarcoma cell lines (U-2OS) formed networks containing channels when grown in three-dimensional culture containing type I collagen, in the absence of endothelial cells or fibroblasts. Morphometric observation using HE stain and CD31 immunohistochemical stain showed that tumor cell-lined channels were also detected in vivo in osteosarcoma; by comparison, all vascular areas in the pedicle of osteochondroma or outside osteochondroma were endothelial-lined. CONCLUSION: These observations strongly suggest that aggressive osteosarcoma cells may generate vascular channels that facilitate tumor perfusion independent of tumor angiogenesis and have the ability of vasculogenic mimicry.