No abstract

No abstract

In situ phosphorous MRS was employed to study the metabolites of normal and cancerous breasts, and the alterations of tumor response to therapy. In a group of 7 normal volunteers and 12 patients, the total mobile phosphate content of breast carcinomas was found to be at least two to three times higher than that of the normal breast measured off menstruation. The metabolite profiles of normal and tumorous breasts are coarsely similar. In both cases the intracellular pH (pHi) was either neutral or slightly alkaline (pH greater than 7.0). Prior to treatments, the metabolite levels of phosphoryl monoester-to-ATP ratio of breast neoplasms were higher than those of the controls and decreased after the patients received a few treatments while the pHi fluctuated at a value greater than 7.0. The phosphoryl diester-to-ATP ratio also demonstrated to a lesser extent a decreasing trend in response to therapy.

A retrospective study was performed on 89 patients who underwent total colectomy and ileorectal anastomosis for extensive mucosal ulcerative colitis between the years 1957 and 1977 in order to determine the risk of developing cancer of the rectum. The 30-day operative mortality rate was 0%. Of the 84 patients available for follow-up study, four patients, (4.8%) developed a carcinoma of the rectum. The risk of cancer per patient-year was zero in the first decade, 1/206 in the second decade, and 1/116 in the third decade. The cumulative risk of developing cancer was 0% at 10 years, 2.1% +/- 2.1% at 15 years, 5.0% +/- 3.5% at 20 years, and 12.9% +/- 8.3% after 25 years of disease. Patients with cancer or precancer in the colon at the time of colectomy appear to be at high risk for the later development of rectal cancer.

Thirty-five human neoplasms from various sites and of various histologic types and stages were examined with phosphorus-31 magnetic resonance spectroscopy in situ. The tumors included 13 squamous cell carcinomas of the head and neck (lymph nodes), eight Hodgkin lymphomas, six non-Hodgkin lymphomas, four carcinomas of the breast, one melanoma, one sarcoma, one neuroblastoma, and one mucoepidermoid sarcoma of the salivary glands. Thirty-four of the neoplasms had normal to slightly alkaline pH before irradiation. During fractionated radiation therapy, the pH stayed in a range of from near neutral to alkaline and rose to 7.6-8.0 at several time points of radiation therapy for some tumors. These results suggest that most tumor cells in human neoplasms are well oxygenated and that only a negligible fraction are chronic hypoxic cells. The fluctuating alkaline pH during radiation therapy occurred regardless of the responsiveness of the treated tumors.