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Biomedical subjects

T Umeda

Publications and source records attributed to T Umeda.

At least 253 records · Page 14Linked to original sources
PubMed1987

[Fast neutron radiotherapy in the treatment of limb-salvage surgery in patients with osteosarcoma].

Preoperative radiotherapy and systemic chemotherapy are effective for reducing the size of a tumor and rendering it resectable. The results achieved with systemic chemotherapy are ultimately reflected in improved survival. Moreover, limb-saving procedure in the treatment of osteosarcoma has become possible with rationality in carefully selected patients. Since 1975, 38 patients with osteosarcoma within an age range of 5 to 56 years, (average 17.9 years) have been treated by fast neutron radiotherapy, systemic chemotherapy and limb-salvage surgery. Twenty-two of these 38 patients underwent en bloc resection of the femur, eight resection of the proximal tibia and five resection of the proximal humerus. Only one of the 38 patients had evidence of local tumor recurrence and overall, 31 patients are currently alive without distant metastasis after 9 to 120 months follow-up. Preoperative fast neutron radiotherapy was employed and it was suggested that fast neutrons had a higher relative biological effectiveness and a greater therapeutic gain factor in comparison with X-rays. Fast neutron radiotherapy thus seems capable of playing a significant role in the treatment of osteosarcoma and is specifically useful for preservation of the affected limb.

Adolescent↗
PubMed1986

Phase II study of alpha interferon on renal cell carcinoma. Summary of three collaborative trials.

A cooperative study was carried out in 44 institutions in Japan to evaluate the clinical efficacy of two kinds of recombinant human leukocyte interferon (Ro 22-8181 and Sch 30500) and a human lymphoblastoid interferon (MOR-22) on metastatic lesions of renal cell carcinoma. Of 226 evaluable cases, efficacy was observed in 40 cases; complete response (CR) in 4 cases, and partial response (PR) in 36 cases, indicating an overall response rate of 17.7%. Although there were no statistically significant differences in age range, sex distribution, and performance status between responders and nonresponders, the incidence of poor response was significantly higher among patients in whom primary renal cell carcinoma had remained or in those who had prior chemotherapy and/or radiation therapy. When response was assessed with regard to individual metastatic sites of renal cell carcinoma, pulmonary metastasis was significantly susceptible to interferon treatment, compared to other metastatic sites. The median period to achieve CR or PR was 45 days (range, 22-211 days) and the median length to maintain CR or PR was 79 days (range, 29-278 days). The median of pulmonary metastatic area that was measured by the sum of the products of the largest perpendicular diameters was 7.2 cm2 (0.5-107.8 cm2), which was reduced to 1.1 cm2 (0-48.8 cm2) by alpha interferons. Cumulative survival of all responder patients was significantly longer than that of other patients with poor response.

Adenocarcinoma↗
PubMed1986

Studies of hypothyroidism in patients with high iodine intake.

Twenty-two patients with spontaneously occurring primary hypothyroidism were studied to evaluate the spontaneous reversibility of the hypothyroid state. Twelve (54.5%) became euthyroid after restriction of iodine intake for 3 weeks (reversible type). In the remaining 10 patients, thyroid function did not improve with restriction of iodine alone, and thus, replacement therapy was required, (irreversible type). In the reversible type, 1) radioactive iodine uptake after 1 week of restricted iodine intake was higher than in the irreversible type [50.0 +/- 12.2% (+/- SD) vs. 4.3 +/- 3.2%; P less than 0.01], 2) the perchlorate discharge test was positive in 2 of 10 patients, and 3) the iodine-perchlorate discharge test, carried out in 7 of 8 patients with negative perchlorate discharge test, was positive in 6. Seven patients with the reversible type were given 25 mg iodine daily for 2-4 weeks; all became hypothyroid again. Two patients had a history of habitual ingestion of seaweed (25.4 and 43.1 mg iodine, respectively), but the remaining 10 patients ingested ordinary amounts of iodine (1-5 mg) daily. The patients with reversible hypothyroidism had focal lymphocytic thyroiditis changes in the thyroid biopsy specimen, whereas those with irreversible hypothyroidism had more severe destruction of the thyroid gland. These results indicate the existence of a reversible type of hypothyroidism sensitive to iodine restriction and characterized by relatively minor changes in lymphocytic thyroiditis histologically. Attention should be directed to this type of hypothyroidism, because thyroid function may revert to normal with iodine restriction alone.

Adult↗
PubMed1986

Pheochromocytoma associated with adrenocortical adenoma: case report and literature review.

The case of a 60-year-old woman with pheochromocytoma and concomitant adrenocortical adenoma in the same gland is presented. She complained of episodic headache, palpitation, nausea, vomiting and sweating. Physical examination revealed that the patient has generalized obesity, wet skin and paroxysmal hypertension, but no signs of Cushing's syndrome. Elevated levels of urinary noradrenaline, adrenaline and total metanephrine were sequentially observed. In addition, urinary 17-OHCS was also slightly elevated, but plasma cortisol was normal and suppressed after oral administration of 0.5 mg of dexamethasone. Abdominal echography and CT scanning demonstrated a left adrenal tumor, which took up both 131I-meta-iodobenzylguanidine and 75Se-scintadoren in the same region. A left adrenalectomy was performed and the tumor was found to consist of two parts, pheochromocytoma (2.5 X 2.5 X 2.5 cm) and cortical adenoma (2.5 X 3 X 5 cm). A total of 23 reported cases showing evidence of hyperfunction of the adrenal cortex and the medulla were noted. So far as we know, this patient was the second case of pheochromocytoma with adrenocortical adenoma in Japan.

Adenoma↗
PubMed1986

Elevation of anti-DNA antibody titer during thyrotoxic phase of silent thyroiditis.

The elevation of anti-DNA antibody titers was observed in two cases of silent thyroiditis; the levels reverted to normal as thyrotoxicosis improved. Biopsy specimens of the thyroid gland revealed chronic lymphocytic thyroiditis. The elevation of anti-DNA antibody titers during the thyrotoxic phase of silent thyroiditis, to our knowledge, has not been reported. In one case, antinuclear antibody testing was also positive during the thyrotoxic phase and became negative in the euthyroid state. These observations provide further support for autoimmunity in silent thyroiditis.

Antibodies, Antinuclear↗