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Biomedical subjects

A Shibata

Publications and source records attributed to A Shibata.

At least 649 records · Page 36Linked to original sources
PubMed1982

[Substance P].

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Animals↗
PubMed1982

[Therapeutic results of DCMP therapy (2M-80) in acute non-lymphocytic leukemia--the relationship between the residual leukemic cells and duration of remission].

In this study the duration of complete remission by daunomycin, cytosine arabinoside (Ara-C), 6MP and prednisolone (DCMP) therapy using a large dose of Ara-C (200 mg) (protocol 2M-80) was compared with that of DCMP therapy with a low dose of Ara-C (80-160 mg) in acute non-lymphocytic leukemia (ANLL). In protocol 2M-80, the chemotherapy was continued until leukemic blasts in marrow were attained below 3%. Complete remission was induced in about 80% of ANLL patients in both chemotherapies. However, the duration of remission in protocol 2M-80 appeared to be much longer than that of DCMP therapy with a low, dose of Ara-C. This difference was dependent not on the consolidation and maintenance therapy, but on the total dose of Ara-C used and leukemic blasts left in marrow at the end of chemotherapy. This suggests that it is important to reduce leukemic blasts in marrow as low as possible by induction chemotherapy to obtain a long-term remission in ANLL.

Acute Disease↗
PubMed1982

A new method for colony formation in vitro by leukemic cells in acute nonlymphocytic leukemia with PHA-stimulated lymphocyte conditioned medium as stimulating factor.

A new agar culture system to clone specifically acute nonlymphocytic leukemia (ANLL) is described, which consists of two phases: an initial liquid phase in the presence of PHA-stimulated lymphocyte conditioned medium (PHA-LCM) and a semi-solid phase. By preincubation of leukemic cells with PHA-LCM in a liquid phase, leukemic cells were found to be more sensitive to forming colonies and clusters in agar medium. In addition, this PHA-two step assay could eliminate colony formation by T cell progenitors. The leukemic origin of the colonies was proven by electron-microscopic analysis, which demonstrated the presence of nuclear blebs and abnormal perinuclear fibril formation. Morphological studies also indicated myeloid differentiation of the cells in the leukemic colonies, although considerable variation was observed among patients. The wide range of linearity between the number of cells plated and the number of colonies grown permits quantitative assay of colony-forming leukemic cells (L-CFU). This assay should be valuable for studies of chemotherapy, growth regulation, and differentiation of L-CFU.

Acute Disease↗
PubMed1982

[Infections during induction chemotherapy of acute leukemia and their control V. Clinical evaluation of a large dose of amikacin injected intravenously].

In this study, we treated severe infections (21 cases) accompanied with induction chemotherapy in 20 patients with acute leukemia by the combination of a large dose (600 approximately 1,200 mg/day) of amikacin with other antibiotics. Infections during induction chemotherapy of acute leukemia consisted of sepsis (8 cases), pneumonia (7) and others (6), and most of causative organisms were Gram-negative bacteria, such as Ps. aeruginosa (7 strains), Flavobacterium (5), Serratia (3), Ps. cepacia (2), E. coli (2) and others. The combination chemotherapy of a large dose of amikacin with other antibiotics was found to be effective (71.4%) for such infections. Side effects were negligible except for drug eruption. Therefore, a large dose of amikacin should be given for the treatment of severe infections accompanied with induction chemotherapy of acute leukemia.

Adolescent↗
PubMed1982

[An in vitro chemotherapy sensitivity test on leukemic colony-forming cells (L-CFU) and its clinical evaluation].

The sensitivity of leukemic progenitor cells (L-CFU) to cytosine arabinoside (Ara-C) and daunomycin (DM) in vitro was studied using PHA -LCM two step assay for L-CFU. Continuous exposure of leukemic and normal bone marrow cells to DM as well as Ara-C in vitro appeared to be more effective than pulse exposure because colony formation was suppressed by a dose dependent fashion. The relationship between in vitro sensitivity to DM and Ara-C and that of in vivo to chemotherapy was investigated in 17 untreated and 5 relapsed patients with acute nonlymphocytic leukemia. The sensitivity of L-CFU to the two chemotherapeutic agents varied from patient to patient. These studies indicated a clear-cut relationship between in vitro drug sensitivity and in vivo response to patients whose L-CFU were sensitive to both agents and entered complete remission, whereas patients whose L-CFU were insensitive to one or both drugs in vitro failed to enter remission. This assay system appears to be useful in predicting response of patients to chemotherapy and in selecting the most effective drugs for an individual patient use.

Acute Disease↗