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Biomedical subjects

D Osoba

Publications and source records attributed to D Osoba.

At least 109 records · Page 6Linked to original sources
PubMed1980

Prognostic value of skin testing with dinitrochlorobenzene in patients with head and neck cancer.

Of 107 patients with cancer of the head and neck region in whom sensitization with dinitrochlorobenzene (DNCB) was attempted at the time the patient first presented, 57 became positive while 50 remained negative. These two groups were similar with respect to age, sex, involved sites and extent of tumour at presentation, but the mortality in the DNCB-negative group (38%) was twice as high as that in the DNCB-positive group (17.5%). Since both groups were treated in a similar fashion and have been followed-up for equal periods of time, the difference in mortality suggests that DNCB skin testing is of prognostic value in patients with cancer in the head and neck region.

Adult↗
PubMed1976

The use of oral BCG in the treatment or metastatic malignant melanoma.

This study assess the effects of oral BCG, as a single agent, on tumor progression and on cell-mediated immune function in patients with metastatic malignant melanoma. Thirty patients were studied including 22 with measurable metastatic lesions and 8 with no detectable disease, following treatment of metastases by surgery, radiotherapy, or 5-(3, 3-dimethyl-1 -triazeno)-imidazole-4-carboxamide (DTIC; DIC). Oral BCG was given in doses of 120--240 mg, 1--3 times per week for periods ranging from 9 to 80 weeks and to total doses of from 1.2 to 20.1 gm. Patients were assessed by direct measurements of tumor mass, PPD skin test and in vitro blastogenic responses to PPD PHA. Of the 22 patient with measureable disease, 19 showed tumor progression and none showed regression of any lesion. Of the 8 without apparent disease, 5 remained stable and 3 had tumor recurrence. Of the total group of 30 patients, 8 showed some increased sensitivity to skin testing with PPD. Of 19 tested, 3 showed an increased PPD response in vitro, while 3 showed a decreased response. Six of 20 tested showed an increased PHA response in vitro. Oral BCG alone was not effective as an antitumor agent in patients with metastatic malignant melanoma.

Adult↗
PubMed1975

A simple freezing and storage method to preserve the stimulating function of leukocytes in the mixed leukocyte reaction.

Human peripheral blood leukocytes retain their capacity to function as stimulating cells in the one way MLR after freezing and storage at - 70 degrees C by a simple and inexpensive method. This storage method facilitates the use of a standard stimulating pool of cells from three donors which may provide a quantitative assay for testing the ability of cells to respond to allogeneic cells in culture.

Freezing↗
PubMed1973

Differentiation of thymus-derived cells from precursors in mouse bone marrow.

An experimental model system was developed to study the differentiation of thymus-derived (T) cells from progenitors in bone marrow. In this system transplantation of bone marrow cells depleted of T cells gave rise to T cells in the spleens of irradiated recipients within 15 days of transplantation. Thus, normal bone marrow contains a class of cells that are progeniotrs of T cells (PT cells). PT cells are different from T cells since PT cells are incapable of responding to alloantigen, are theta resistant, and band in a lighter density region than do T cells. The density profile of PT cells is different from that of hematopoietic stem cells (CFU-S); PT cells band in a denser region of the gradient than do CFU-S.

Animals↗