= 3 GeV. The Stanford Linear Accelerator Laboratory results of e+e -l+l +missing energy can be explained as e', e' production followed by decays to ev, , JU, v&, or their antiparticles. The v, ' would be absolutely stable and escape detection. The decay of the v"' requires a mixing of either v&' or p. ' with lighter leptons.The charmed quark c will decay preferably to the p quark through the enhanced J'J'" interaction. Leptonic decays of the cn can then account for the dileptonic events seen at FNAL. The heavy pseudoscalars A. 'n, c'c, etc. , will decay via the enhanced O'J to other heavy mesons. The P'n, , n,'n, etc. , decay via the weaker interactions such as O'J', J Js or O'K', J'I . The model also in general predicts CP nonconservation by virture of the fact that J', J' are CP even while J is CP odd, so that terms linear in J' do not conserve CP. This point will be discussed in a longer paper under preparation.
A prototype device called an extracranial stereotactic radiosurgery frame was used to deliver stereotactic radiosurgery, with a modified linear accelerator, to metastatic neoplasms in the cervical, thoracic, and lumbar regions in five patients. In all patients, the neoplasms had failed to respond to spinal cord tolerance doses delivered by standard external fractionated radiation therapy to a median dose of 45 Gy (range, 33-65 Gy/11-30 fractions). The tumors were treated with single-fraction stereotactic radiosurgery with the spinal stereotactic frame for immobilization, localization, and treatment. The median number of isocenters was one (range, one to five) with a median single fraction dose of 10 Gy (range, 8-10 Gy) with median normalization to 80% isodose contour (range, 80-160%). There has been a single complication of esophagitis to date from radiosurgery of a tumor involving the C6-T1 segments; the esophagitis resolved with medical therapy. Median follow-up in this group of patients has been 6 months (range, 1-12 mo). To date, there has been no radiographic or clinical progression of the treated tumor in any patient. Two patients have died from systemic metastatic disease. In the three surviving patients, there has been computed tomographic- or magnetic resonance-documented regression of the treated tumor with a decrease of thecal sac compression with a median follow-up of 6 months (range, 3-14 mo). These five patients represent the first clinical application of stereotactic radiosurgery in the spine. The results suggest that extracranial radiosurgery may be suitable for the treatment of paraspinal neoplasms after external fractionated radiation therapy, even in the face of spinal cord compression.
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