When I was asked by the Cancer Teaching Committee of the University of Chicago to set up a Symposium on Brain Tumors, I welcomed the opportunity to do so. But I felt that "Brain Tumors" was far too broad a subject to cover in a day and a half meeting. Furthermore, during the past decade, there have been a great many papers and symposiums on technical advancements in the treatment of benign brain tumors. On the other hand, while gliomas make up somewhere around 50% of all brain tumors, there have certainly been far fewer communications about them. For this reason I thought that it would be highly valuable to invite some of the leading investigators to share with us their experience with gliomas. The hope was to learn the current concepts about these tumors biologically and therapeutically, specifically to find out what we are doing and where we are going in these respects. Naturally all aspects could not be covered. Nevertheless, it was a widely expressed opinion by the speakers that they too learned while they came to teach. It is therefore hoped that the publication of their works and ideas through this mono­ graph will also be useful for the reader. Most of the manu­ scripts were handed in at the time of the Symposium, and a few were sent later. Except for minor editorial changes the words are entirely those of the speakers and authors.

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Opening of the Symposium.- Introductory Remarks.- Session I.- The Significance of Experimental Gliomas for Human Disease.- Refinement of the Avian Oncornavirus-Induced Primary Rat Brain Tumor Model for Therapeutic Screening.- Studies on the Differentiation of Human and Experimental Gliomas in Organ Culture Systems.- Scanning Electron Microscopy of Cerebral Tumors and Glial Cells.- Discussion.- Session II.- Neuroradiologic Aspects of Gliomas.- Computerized Tomography in Relation to the Diagnosis of Gliomas.- Heavy Ion (Proton) Radiography in Medical Diagnosis.- Treatment of Supratentorial Gliomas.- Treatment of Infratentorial Gliomas in Childhood.- Discussion.- Session III.- Thoughts on the Biology and Therapy of Malignant Gliomas.- Chemotherapy: Current Results and Future Prospects.- Conventional Radiation Therapy of Gliomas.- Some New Radiotherapeutic Approaches and Combined Protocol Trials in the Management of Malignant Gliomas.- Discussion.- Closing Remarks.- Epilogue: Treatment of Glioma - How Far Have We Come, What Are We Doing, and Where Are We Going?.