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S Kuroda

Publications and source records attributed to S Kuroda.

507 records · Page 29Linked to original sources
PubMedDate not supplied

Squamous cell carcinoma of the external auditory canal: two cases treated with high dose rate 192Ir remote afterloading system (RALS).

We report two cases of early-stage external auditory canal cancer treated by intracavitary irradiation with a high dose rate (HDR) 192Ir remote afterloading system (RALS) for preoperative treatment. A 6-Fr catheter for the HDR 192Ir remote afterloader, fixed by a plastic earplug, was inserted into the external auditory canal in two cases (case 1, T2N0M0; case 2, T1N0M0). The total intracavitary radiation dosages were 50 Gy (10 Gy/2 Fr/wk for 5 wks) for case 1, and 42 Gy (15 Gy/5 Fr/wk for 3 wks) for case 2. No external irradiation was given in either case. Surgical resection was performed in both cases, three to four weeks after irradiation. Histopathological examination confirmed the post-irradiation changes of necrosis, hyalinosis, and calcification, although vivid cancer cells remained. In preoperative irradiation of external auditory cancer, this method, although limited to treating early-stage cancers, may be a modality of choice for its efficacy and less severe side effects.

Brachytherapy↗
PubMedDate not supplied

Expression of CSF-1 receptor on TRAP-positive multinuclear cells around the erupting molars in rats.

Bone resorption overlying a developing tooth is a necessary event in the creation of an eruption pathway. The formation and function of osteoclasts, which play a major role in bone resorption, are controlled by several factors. Although CSF-1 and its mRNA are expressed in dental follicle cells required for eruption, little is known about the contribution of CSF-1 to osteoclast formation on the bony crypt around the tooth germ. The receptor protein of the CSF-1 encoded proto-oncogene c-fms was identified on multinucleated cells adjacent to the dental follicle, in conjunction with TRAP staining as a marker enzyme for osteoclasts in rat. c-Fms was highly expressed in TRAP-positive multinuclear cells at 3 days postnatal and the number of c-Fms-expressing cells was reduced thereafter. Administration of IL-1alpha, which enhances formation and function of osteoclasts, caused an increase in the number of c-Fms and TRAP-positive cells in rat. On the contrary, injection of calcitonin, which depresses osteoclast formation, caused a decrease in the number. It is obvious that the receptor of CSF-1 is expressed on the surface of osteoclasts around the tooth germ, on the dental follicle. These findings suggested that CSF-1 directly enhances the influx of osteoclasts adjacent to the erupting tooth, resulting in the formation of an eruption pathway.

Acid Phosphatase↗