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Biomedical subjects

T L Phillips

Publications and source records attributed to T L Phillips.

At least 217 records · Page 12Linked to original sources

Combined treatment methods for carcinoma of the esophagus.

From 1950 to 1973, 129 patients received irradiation for esophageal squamous-cell carcinoma at the University of California, San Francisco. From this group, 26 received surgical and irradiation treatment. Twelve did not receive irradiation until recurrence became evident and among them were no 5-year survivors. Among the other 14 were six 5-year survivors (43%). The authors believe that planned sequential irradiation and surgery offer the best chance for cure in squamous-cell carcinoma of the esophagus. Selection factors, treatment details, and therapeutic regimens are presented and a management plan proposed for this group of operable patients.

Aged↗

The hypoxic cell sensitizer programme in the United States.

The initial results of a Phase I evaluation of misonidazole in the U.S.A. are described, as well as the U.S. National Cancer Institute programme for radiosensitizer development. A total of 12 patients have been given 1--6 doses of 1--2 g/m2. Serum levels ranged from 25--87 microgram/ml at 4--6 h. One patient has developed mild peripheral neuropathy. Urinary excretion was chiefly of a demethylated metabolite as measured by HPLC assay.

Aged↗

Chemical modification of radiation effects.

A number of powerful chemical compounds that modify radiation effects have been discovered and tested both in the laboratory and clinically over the past 25 years. There are four major classes of compounds: aminothiol radio-protectors which act on well vascularized euoxic cells and concentrate in tissues such as skin, gut and marrow; nitromidazole radiosensitizers which act on hypoxic tumor cells; pyrimidine analogues which are incorporated into the DNA of cycling cells and cause radiosensitization; and cancer themotherapy agents which, in addition to their ability to kill tumor cells directly, also may sensitize tumor and normal cells to radiation. The mechanism of action, experimental activity, and clinical results or the potential for each of these agents are reviewed.

Animals↗

Malignant tumors of the testis: analysis of treatment results and sites and causes of failure.

A total of 150 patients with germinal testicular neoplasms treated at the University of California, San Francisco, were reviewed. The 5-year actuarial survival rate was 95% for 57 patients with seminoma and 56% for 75 patients with carcinoma. Treatment modalities were compared with respect to sites and causes of failure and complications. The most common sites of failure in the carcinoma patients were lung, and supraclavicular or mediastinal lymph nodes. Scrotal orchiectomy, elevated gonadotropins, elements of choriocarcinoma, and bulky abdominal disease were all correlated with high treatment failure rate.

Carcinoma↗

Acute and late effects of multimodal therapy on normal tissues.

The increasing use of combined radiation, chemotherapy, and surgery had led to an increased incidence of acute and late complications. The complications are, in general, similar to those seen with each modality alone, but occur with increased incidence. Enhanced effects of combined radiation and surgery are modest in number and consist primarily of problems with wound healing and fibrosis, as well as late gastrointestinal damage. Combinations of radiotherapy and chemotherapy have shown a greater degree of enhanced acute and late reactions. Drugs, such as actinomycin-D and Adriamycin, are particularly dangerous if the marked enhancement of radiation effects caused by the drugs in almost all organs is not appreciated and the radiation dose not adjusted accordingly. Proper selection of drugs can lead to enhanced local control by radiotherapy and/or surgery, as well as eradication of microscopic distant metastases, without increased normal tissue injury. Late induction of malignancy can occur with either radiation or chemotherapy alone and, in some cases, this appears to be enhanced when they are combined.

Antineoplastic Agents↗

Immunologic competence in adults following thymic irradiation in infancy.

Removal of, or irradiation to, the thymus during the neonatal period in man has resulted in no reported adverse effects on cellular immunity, although thymectomy in neonatal experimental animals is known to produce profound immunological disturbances. Adverse effects in humans may not be recognized until several decades have passed. The immunological capabilities of 7 adults with histories of thymic irradiation as infants were evaluated; normal tests results indicated intact immune systems in all cases. The 3 women tested, however, had abnormal clinical histories, including 2 with multiple tumors and 1 with chronic mucocutaneous candidiasis.

Adult↗

Desmoid tumors--treatment and prognosis.

Desmoid tumors are locally invasive benign tumors arising from musculoaponeurotic structures which are classified as fibromatoses and which have generally high post-surgical recurrence rates. Sixteen patients with desmoid tumors were treated with irradiation and evaluated for 2 to 6 years post-treatment. Of the 16, 13 cases have been controlled without recurrence. Virtually complete resolution of the tumor mass has been accomplished without the disfigurement and dysfunction characteristic of the radical surgical approach to treatment.

Adolescent↗

Results of integrated management of supraglottic carcinoma.

Between January 1957 and June 1974, 173 patients with carcinoma of the supraglottic larynx were treated by an integrated approach at the University of California in San Francisco. The policy was to use radiotherapy or surgery alone for Stage I and II disease, radiotherapy combined with either supraglottic laryngectomy or total laryngectomy for resectable Stage III and IV disease, and radiotherapy alone for advanced unresectable disease. Control of the disease in the primary site was achieved in 92% of T1a, 88% of T1b, 80% of T2, 79% of T3 and 56% of T4 lesions. Of the 36 patients with late Stage I and resectable Stages III and IV disease treated by combined preoperative radiotherapy and supraglottic or total laryngectomy, the primary lesion was controlled in 33 (92%). Recurrent disease in the primary site after radiotherapy alone, when detected early, was usually controlled by subsequent surgery, whereas recurrent disease after surgery was not controlled by radiotherapy. Preservation of a functioning vocal apparatus was achieved in 44% of the patients whose primary lesion was controlled. Control of cervical lymph node metastasis was achieved in 71% of N1, 38% of N2, and 25% of N3 disease. No disease recurred in the radically dissected neck which received preoperative radiotherapy. Radiotherapy also reduced the incidence of subsequent neck disease in patients without cervical lymph node metastasis initially from 23% to 14%.

Adult↗

Isolation of rabbit muscle glucosephosphate isomerase by a single-step substrate elution.

A simple method has been developed for the rapid isolation of crystalline glucosephosphate isomerase (EC 5.3.1.9) from rabbit muscle. The enzyme is first bound to cellulose phosphate by adding the ion exchanger to a solution of the crude tissue extract. After filtering and washing the cellulose with buffer, the isomerase is specifically eluted in a batch process by its substrate, glucose 6-phosphate. The entire procedure is very rapid and results in a good recovery (at least 50%) of the enzyme with specific activity of approximately 900 units per mg. The enzyme is homogeneous by polyacrylamide gel electrophoresis in the presence of absence of sodium dodecyl sulfate and by analytical ultracentrifugation.

Animals↗

Quantification of combined radiation therapy and chemotherapy effects on critical normal tissues.

In order to determine the modification of radiation effects on critical normal tissues which occurs with combinations of radiation and cancer chemotherapy, a review of laboratory and clinical data has been carried out. Information on 10 different normal tissues is available. It is clear that the antibiotic cancer chemotherapeutic agents are the most likely to enhance radiation injury, with increased levels reported in all tissues except the central nervous system. The second most common type of injury with combination therapy appears to occur with drugs causing injury to the normal tissue on their own, such as adriamycin in the heart and methotrexate in the central nervous system. Quantification of the dose-effect factor is only available on a limited number of tissues, and, primarily, in experimental animals. From these limited data, it is clear that dose-effect factors between 1.1 and 1.8 are seen, indicating that radiation doses must be reduced by 10-80% for the same level of injury when combined with chemotherapy. The augmentation of radiation damage by cancer chemotherapeutic agents is a serious problem in a wide range of tissues, but a problem which can be dealt with by accurate knowledge as to the dose-effect factor and appropriate modification of the radiation treatment.

Antineoplastic Agents↗

Time, dose and volume factors in interstitial Radium implants of carcinoma of the oral tongue.

In a retrospective computer dosimetry analysis of 58 patients with carcinoma of the oral tongue treated with interstitial radium implants alone or in combination with external irradiation, dose and volume appear to be the most important factors in both local control and the incidence of necrosis; in the dose rate range commonly used in clinical interstitial radiotherapy, dose rate has no significant effect. The optimal minimum tumor doses for local control vary with the size of the primary lesion: 6,000 rads for T1 lesions and 6,500 rads for T2 lesions treated with interstitial radium implants alone and 7,500 rads for lesions treated with interstitial radium implants in combination with external irradiation. For lesions treated with implants plus external irradiation, greater local control was achieved when most of the dose was delivered through the interstitial implants. For a given volume, the incidence of necrosis was directly proportional to the degree of overdosage; for a given dose, the incidence of necrosis was directly proportional to the volume receiving the dose.

Carcinoma, Squamous Cell↗

The role of radiation therapy in the treatment of osteosarcoma.

Seventy patients received primary surgical or radiotherapeutic treatment for osteosarcoma at the University of California-San Francisco between 1950 and 1974. Twenty-two received surgery alone and 27 received preoperative irradiation followed at varying intervals by surgery. Twenty-one patients received irradiation alone because of tumor location, refusal of recommended surgery, or development of metastatic disease. The results are analyzed and the role of radiation therapy in the primary management of osteosarcoma is discussed. The authors believe that irradiation without chemotherapy offers little in terms of palliation or enhanced survival in patients who are able to undergo radical surgery.

Adolescent↗

The relative biological effectiveness (RBE) and oxygen enhancement ratio (OER) of neon ions for the EMT6 tumor system.

EMT6 tumors were exposed to neon ions in vivo and in vitro in the plateau and spread-out Bragg peak regions of the beam. The RBE in vivo was 1.7-2.1 in the plateau region and 2.6-2.9 in the Bragg peak; the OER was 2.0 and 1.4, respectively. Neon ions have great potential in the radiotherapy of tumors because of their decreased OER and excellent depth-dose distribution in tissue.

Animals↗