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Biomedical subjects

J A Double

Publications and source records attributed to J A Double.

At least 91 records · Page 5Linked to original sources
PubMed1977

Hydrolytic enzymes in colorectal cancer.

Activities of sulphatases A/B, sulphatase C, beta glucuronidase, acid and alkaline phosphatase were measured in 38 cases of colorectal cancer. A wide variation in the levels of individual enzymes was observed, suggesting that certain patients might benefit from therapy with tailor made enzyme activated anti-tumour agent. The activity of sulphatase C was correlated with the other lour, but the enzyme profile could not predict the evofution of the disease.

Acid Phosphatase↗
PubMed1975

Transplantable colon tumors as chemotherapy screening models.

A series of transplantable murine colon tumors have been developed from primary tumors induced by dimethylhydrazine. They are moderately- to well-differentiated adenocarcinomas which retain their histologic appearance and growth characteristics through successive transplant generations. The sensitivity of two tumor lines to 11 standard drugs is reported and some correlation shown with the sensitivity of human colorectal tumors to the same drugs. Therapeutic indices are low and each tumor has an individual pattern of sensitivity. The models have potential as secondary drug screening systems and for investigation of factors affecting drug sensitivity.

Adenocarcinoma, Mucinous↗
PubMed1975

Transplantation of adenocarcinomas of the colon in mice.

1, 2-Dimethylhydrazine treatment induced multiple colon tumors in 100% of NMRI mice. Many of these tumors were transplanted and yielded five serially transplantable tumor lines. These subcutaneously transplanted neoplasms were all adenocarcinomas varying in degree of differentiation and mucin production. No evidence of dedifferentiation or change in growth rate has been seen in up to six transplant generations. These tumor lines appeared to provide relatively stable, well-differentiated models for colorectal cancer.

Adenocarcinoma↗
PubMed1975

Human tumour xenografts.

The historical development, and more recent advances in the use of xenografts of human tumours as potential models for the study of human cancer are described and discussed. The practicality of the various systems available are critically reviewed, as well as their potential application in the field of experimental chemotherapy. Emphasis is given to the fact that over two decades of research effort has hardly produced any results of clinical relevance, often because workers have been too carried away with their technical achievements to appreciate the rules of experimental chemotherapy. The role of human tumour xenografts in the study of human cancer is appreciated, but the development of newer syngeneic, differentiated animal models may lessen their importance in the field of experimental chemotherapy.

Animals↗
PubMed1971

The sensitivity to chemotherapeutic agents of a rat tumour grown in immunosuppressed mice.

The rat Walker 256 tumour was grown in mice that had previously been thymectomized and treated with anti-lymphocyte serum. These rat tumour-bearing mice were used to determine the therapeutic indices of 4 anti-tumour drugs.The agent with the highest index of the four examined was 5-aziridino 2,4-dinitrobenzamide (CB1954), followed by melphalan, aniline mustard and methotrexate, in that order. This rank order is the same as that found when therapeutic indices are determined on the Walker tumour growing in the rat. In this system, therefore, drugs have been ranked correctly in effectiveness against a rat tumour by measuring their effects on the tumour when growing in an immunosuppressed xenogeneic species. The implications for testing the drug sensitivity of individual human tumours before treating the patient are discussed.

Animals↗