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Biomedical subjects

J Healey

Publications and source records attributed to J Healey.

6 recordsLinked to original sources
PubMed1992

The relationship between thallium uptake, blood flow, and blood pool activity in bone and soft tissue tumors.

Twenty patients with known primary untreated and recurrent bone and soft tissue tumors underwent thallium imaging and three-phase bone imaging in the same session. The ratio of thallium uptake in the tumor tissue to the contralateral normal tissue areas was compared with the same ratio for phase 1 (blood flow or arterial phase), phase 2 (blood pool), and phase 3 (delayed medroxy-diphosphonate, MDP, uptake). There was poor correlation between Tl uptake and phases 1 and 3 of the bone scan ratios; r = 0.37 and 0.46; P = 0.097 and 0.047, respectively. The thallium uptake ratios correlated well with blood pool ratios (phase 2) (r = 0.84 and P less than 0.01). In contrast to uptake into normal muscle, Tl-201 uptake into tumor is not highly dependent on blood flow alone and other factors predominate in determining its magnitude.

Bone Neoplasms↗
PubMed1992

Chemotherapy for nonmetastatic osteogenic sarcoma: the Memorial Sloan-Kettering experience.

PURPOSE: Adjuvant chemotherapy improves disease-free survival (DFS) for patients with osteogenic sarcoma (OS). We reviewed our experience with OS to determine prognostic factors, the role of preoperative chemotherapy and subsequent histologic response, and the role of salvage chemotherapy after poor initial response. METHODS: From 1975 to 1984, we saw 279 patients with previously untreated OS without metastasis. All patients received intensive chemotherapy and underwent surgical resection of primary tumor. Chemotherapy included high-dose methotrexate; Adriamycin (doxorubicin; Adria Laboratories, Columbus, OH); and bleomycin, cyclophosphamide, and dactinomycin (BCD). Selected patients also received cisplatin. RESULTS: DFS was not affected by use of preoperative chemotherapy versus immediate surgery, by use of limb-sparing surgery versus amputation, age, sex, or dose intensity of chemotherapy. DFS did correlate with serum lactate dehydrogenase (LDH), alkaline phosphatase, primary tumor site, race, and histologic response to preoperative chemotherapy. There was no difference in DFS for patients with a poor histologic response who did or did not receive cisplatin, although patients who did receive cisplatin had a longer time to relapse. The 5-year DFS was 76% for patients aged less than or equal to 21 years who had extremity primary tumor and were treated with the T10 protocol. CONCLUSIONS: Intensive chemotherapy can achieve DFS for a high proportion of patients with OS. Although it is a powerful predictor of DFS, histologic response to preoperative chemotherapy cannot be assessed at diagnosis. We have not shown an ability to salvage patients with an unfavorable response. We need to increase the proportion of patients with a favorable response, identify the patients who will have an unfavorable response, and develop novel treatments to salvage poor responders.

Adolescent↗
PubMed1978

Binding of Triton X-114 to mammalian serum albumins at critical micelle concentration.

When the nonionic detergent Triton X-114 binds to different mammalian serum albumins, remarkably little variation occurs in the number bound at the critical micelle concentration of the detergent. Average molar ratios range from 4.0 to 6.3; mean body weights range from 0.25 to 600 kg. Measured values of the extinction coefficients reported here also show remarkably little variation. These results support the view that the folding of these serum albumins is similar.

Animals↗