REPORTS ON SEMINARS
(1) Seminar on "Advances and New Techniques in Radiation oncology Research"
A joint seminar was held in Seattle, Washington, from May 2-4, 1984, to discuss radiation research. Attention was focused on the basic and applied aspects of new radiation techniques.
A considerable discussion dealt with neutron therapy trials in the United States and Japan. Structural organization and planning of such efforts were discussed by Drs. Wooton, Ito, and Hall. Specific protocols and preliminary clinical experiences were described by Drs. Ishikawa, Tsunemoto, Griffin, Laramore, Morita, and Peters.
Issues of hyperthermia and chemical sensitizers plus radiotherapy likewise received considerable attention. Most of the former topic considered the physical devices and technology for heating and monitoring patients. Drs. Stewart, Onoyama, and Abe described these clinical experiences. A variety of putative radiation sensitizers including nitro-imidazoles, glutathione depletors, and others were also discussed. Both laboratory and clinical models were proposed for study in appropriate situations.
Unique, nonconventional radiation schedules (such as hyperfractionation) were discussed by Drs. Withers, Peters, and Sakamoto. Issues of normal tissue versus tumor injury were of crucial concern.
Finally, regional radiation therapy was discussed, both small field intra-operative and large field total body irradiation. Gastrointestinal cancers were the subject of the former and leukemia-lymphoma (in transplant preparation) the latter.
(2) Seminar on "Biochemical Modulation of Chemotherapy and Immunotherapy"
On November 19 and 20, 1984, at the Hotel New Otani in Tokyo, Japan, a seminar was held to discuss biochemical modulation of chemotherapy and immunotherapy. The first day concentrated on chemotherapy modulation and the second on immunotherapy and resistance-reversing mechanisms.
The majority of the first day highlighted issues related to biochemical modulation of pyrimidines, especially 5-fluorouracil (5-FU)-methotrexate (MTX) interactions, and reduced folate cofactors and 5-FU interactions. Dr. Friedman began the meeting with a broad outline of general principles which should be considered in the conduct of clinical modulatory trials. The identification of an appropriate laboratory biochemical parameter is a critical necessity for the most efficient conduct of this complicated sort of clinical investigations. He also presented the response-surface design statistical methodology as a mechanism for trial analysis.
Drs. Fujii, Cadman, Ota, and Akazawa discussed a variety of in vivo and in vitro studies which seek to define the site of biochemical modulation of antifols and fluoropyrimidines. Dr. Fujii described the F!!! alanine hepatic conversion of Ftorofur:

This degradation is catalyzed by dihydrouracil dehydrogenase and is blocked by uracil. In an attempt to favorably influence catabolism, he empirically used a combination of FT plus uracil. A ratio of 1:4 led to FT serum levels of 0.025 µg/ml and tumor level of 0.1 µg/gm. However, only preliminary Phase II studies have been conducted.
Dr. Ota reviewed two Japanese biochemical modulation trials. The first utilized MTX 20 to 1500 mg/m2 plus 5-FU 600 to 1500 mg/m2 (with a 1 to 3 hour interval) every week. Relatively few patients have been studied so far. The second study is a multicenter trial being planned with MTX doses of 30, 100, 300, and 1000 mg/m2 and 5-FU 600 mg/m2, with intervals of 3 or 7 hours. CF will be used for the higher MTX doses. It is anticipated that 50 colon and 100 gastric cancer patients will be evaluated.
Unfortunately, there is no definitive information available at this moment to suggest in which clinical circumstances a particular combination of 5-FU and MTX would be superior to the drugs used alone or simultaneously.
Larger amounts of data are being amassed in the United States, but the definitive Phase III trials have not yet been completed. The Japanese data are more preliminary, but interesting leads have been identified and there are at least two Phase III trials considered in gastric and colon cancer at this time.
Dr. Kovach then described a comprehensive series of experiments he has been performing with tiazofurin, attempting to perturb the intracellular guanine nucleotide pools. These studies could lead to some interesting clinical studies.
Dr. Kimura discussed his clinical studies with uracil plus FT (UFT) combinations and UFT plus MTX. He has initial data that 6 of 17 gastric cancer patients had a PR, but it is not certain whether the addition of MTX results in superior results (10 of 15 PR). Moreover, although the data of the uracil plus FT seems very interesting, it has not been studied in a formal, rigorously controlled way.
Dr. Mihich then described the work of his Roswell Park Memorial Institute collaborators exploring favorable folinic acid plus 5-FU interactions. Based on provocative preliminary data, clinical studies are ongoing at RPMI and other U.S. centers. Dr. Capizzi then described his ara-C studies with the attendant pharmacokinetic and biochemical analyses.
Drs. Sakurai and Mihich described in greater detail the intracellular target of ara-C action and the modulations of these actions by antimetabolites. MTX decreases purine nucleotide pools, while 5-FU decreases dTTP but not dCTP. MTX can also increase deoxycytidine kinase and ara-CTP, while reducing ATP, GTTP, dTTP, and dCTP.
The last portion of the first day was spent on the rationale for combinations of hormonal and chemotherapy for patients with breast cancer. Dr. Osborne provided a thorough and scholarly review of the difficulties in doing such trials and possible research opportunities that exist. Dr. Nomura described the Japanese experience to a combination chemoendocrine trial, which was equivalent to the U.S. experience. The last presentation of the first day was by Dr. Ohsawa who described a new combination of estradiochlorambucil which he calls "Bestrabucil", which seems to have homing properties specific to breast cancer tissue. However, and not explained at all in any of the subsequent discussions, this conjugate seems to seek tumor tissue of all sorts, wherever it is (in the rodent body). A series of the preclinical experiments are being conducted, trying to explain this observation. Dr. Ohsawa suggested that the butyrate moiety on this molecule makes it specifically "attractive" to tumors. This hypothesis generated some skepticism but a good deal of interest as well.
The second day was devoted to issues of immunomodulations and immunotherapy, specifically with interferons or the interferon inducers. Dr. Kataoka described his in vivo and in vitro experimentation with chemotherapy and!!
!and!!
!interferon. Dr. Ishida described the antitumor effects of the OK-432, a substance which is used widely in Japan and which is believed, in part, to be a!!
!interferon inducer.
Dr. Kovach described the laboratory and preliminary clinical findings of combinations of chemotherapy plus interferon. Combinations of DFMO plus IFN, or adriamycin or CDDP or alkylator plus IFN seem to be synergistic. A clinical study of BCNU plus IFN has been initiated at the Mayo Clinic. Dr. Katoaka described a series of vincristine plus interferon studies ongoing in Japan. He postulates that IFN could modify the cell membrane (changing fluidity or microfilaments) or derange metabolism (modifying DNA synthesis, cyclic AMP, prostaglandin E, and 2'-5' adenine). He believes that the major effect is on the microfilaments.
Dr. Makota Ogawa provided a comprehensive overview of the clinical experience with the interferon products in Japan. This was a most useful resume, since an enormous amount of information has been gained. These products have been tested in this way in Japan:
|
Phase
|
Alpha
|
Beta
|
Gamma
|
|
I
|
MOR-22
|
GKT-B
|
GI3 (Genentech)
|
|
II
|
HLBI
|
IF (Kyowa)
|
|
|
III
|
HLBI
|
||
|
IFN-A
|
S (Biogene)
|
|
Disease
|
N
|
CR
|
PR
|
|
Myeloma
|
73
|
1
|
3
|
|
NHL
|
32
|
1
|
2
|
|
ATL
|
10
|
1
|
2
|
| AML |
19
|
0
|
1
|
| Renal |
56
|
4
|
7
|
| Hepatoma |
7
|
0
|
0
|
| Breast |
19
|
0
|
0
|
| I. Fast Neutron Beam Radiotherapy U. S. Co-Chairman: Dr. Stewart |
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| Physical Aspects of the University of Washington Clinical Neutron Beam Therapy Facility | Peter Wootton, B.Sc. | |
| Treatment Planning System for Fast Neutron Therapy in Use in Japan | Akira Ito, Ph.D. | |
| The Radiobiological Aspects of the New Generation of Hospital Based p+ ----> Be Generators | Eric J. Hall, D.Sc. | |
| Evaluation of Fast Neutron Therapy for Carcinoma of the Esophagus | Tatsuo Ishikawa, M.D. | |
| Present Status of Fast Neutron Therapy in Japan | Hiroshi Tsunemoto, M.D. | |
| Clinical Aspects of Fast Neutron Radiotherapy: Current Results and Future Directions | Thomas Griffin, M.D. | |
| Clinical Aspects of Fast Neutron Radiotherapy: Current Results and Future Directions | George Laramore, M.D., Ph.D. | |
| Clinical Experience with Fast Neutron Beam on Carcinoma of the Uterine Cervix | Sinroku Morita, M.S. | |
| Selection of Patients for Neutron Clinical Trials | Lester Peters, M.D. | |
| II. Hyperthermia and Radiotherapy U. S. Co-Chairman: Dr. Withers |
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| Combined Hyperthermia and Radiation: Prognostic Factors for Complete Response | James R. Oleson, M.D., Ph.D. | |
| Development of an RF Capacitive Heating Device, Thermotron RF-8 | Hirokazu Kato, Ph.D. | |
| Overview of the University of Utah Research Program in Hyperthermia | J. Robert Stewart, M.D. | |
| Thermal Distribution After Heating with a Thermotron RF-8 | Hirokazu Kato, Ph.D. | |
| The Bioengineering and Clinical Research Program in Hyperthermia | Kenneth H. Luk, M.D. | |
| Clinical Experiences of Hyperthermia in Cancer Radiotherapy with some Considerations of Thermal Dosimetry | Yasuto Onoyama, M.D. | |
| Clinical Results of Hyperthermia Combined with Radiation for Radioresistant Cancers | Mitsuynki Abe, M.D. | |
| III. Radiation Sensitizers U.S. Co-Chairman: Dr. Peters |
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| The Effects of New Radiosensitizers Developed in Japan on In Vitro and In Vivo Experimental System | Kiyohiko Sakamoto, M.D. | |
| Radiation Sensitizers: Future Prospects | J. Martin Brown, Ph.D. | |
| Thymine Hydroxylation as a Chemical Measure of Radiosensitization and Protection | Tsutomu Kagiya, Ph.D. | |
| Radiosensitization Effects of BSO (DL-buthionine sulfoximine) as an Inhibitor of Glutathione Synthesis in Combination with Hypoxic Cell Sensitizers | Chikara Komuro, Ph.D. | |
| Radiation and Sensitizers in Mutant Human Cells | Eric J. Hall, D.Sc. | |
| Screening of PLD Repair Inhibitors In Vitro and In Vivo for Clinical Use | Tsutomu Sugahara, M.D. | |
| IV. Dose Fractionation Effects in Normal Tissues and Tumors U.S. Co-Chairman: Dr. Laramore |
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| Dose Fractionation Effects in Normal Tissues and Tumors | H. Rodney Withers, M.D., D.Sc. | |
| Dose Fractionation Effects in Normal Tissues and Tumors | Lester J. Peters, M.D. | |
| The Significance of Uneven Fractionation Regime on Cancer Chemotherapy | Kiyohiko Sakamoto, M.D. | |
| V. Role of Computers in Treatment Planning U. S. Co-Chairman: Dr. Griffin |
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| Clinical Aspects | J. Robert Stewart, M.D. | |
| Application of the CT to Treatment Planning and Computer Controlled Conformation Therapy | Tadayoshi Matsuda, M.D. | |
| Computers in Radiotherapy--The Fifth Generation | Ira J. Kalet, Ph.D. | |
| VI. Intraoperative Radiotherapy U. S. Co-Chairman: Dr. Luk |
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| Intraoperative Radiation Therapy for Locally Advanced Rectal Carcinoma | Joel E. Tepper, M.D. | |
| Intraoperative Radiotherapy for Gastrointestinal Malignancy | Mitsuyuki Abe, M.D. | |
| Experimental and Clinical Studies with Intraoperative Radiotherapy: The NCI Experience | Timothy Kinsella, M.D. | |
| VII. Total Body Irradiation and Bone Marrow Transplantation in the Treatment of Leukemia and Malignant Lymphomas | ||
| Irradiation Techniques | E. D. Thomas, M.D. | |
| Total Body Irradiation for Bone Marrow Transplantation in Leukemia: A Cooperative Study from the TBI Subcommittee in Japan | Toshihiko Inoue, M.D. | |
| Clinical Aspects | E. D. Thomas, M.D. | |
| Monday, November 19 | ||
| 9:00-9:10 | Welcome and Opening Remarks | Dr. Yoshio Sakurai |
| Chairman: Dr. R. Capizzi | ||
| 9:10-9:35 | General principles of biochemical modulation trials | Dr. Michael Friedman |
| 9:35-10:00 | Biochemical modulation of effect of Ftorofur | Dr. Setsuro Fujii |
| 10:00-10:25 | The enhancement of 5-fluorouracil antitumor activity by methotrexate pretreatment | Dr. Edwin Cadman |
| 10:25-10:45 | Coffee Break | |
| Chairman: Dr. M. Friedman | ||
| 10:45-11:10 | Sequential methotrexate and 5-fluorouracil in Japan | Dr. Kazuo Ota |
| 11:10-11:35 | Sequential methotrexate and 5-fluorouracil in gastric cancer | Dr. Shugo Akazawa |
| 11:35-12:00 | Tiazofurin, a compound of potential value in manipulating guanine nucleotide pools | Dr. John Kovach |
| 12:00-13:30 | Noon Recess | |
| Chairman: Dr. E. Cadman | ||
| 13:30-13:55 | Clinical basis and effects of UFT and UFTM therapy for gastric cancer | Dr. Kiyoji Kimura |
| 13:55-14:20 | Metabolic modulation as a basis for improved protocol design: The example of 5-FU and folinic acid | Dr. Enrico Mihich |
| 14:20-14:45 | Self potentiation of high dose ara-C: Augmentation of its pharmacokinetics and biochemical pharmacology by its metabolites ara-U | Dr. Robert Capizzi |
| 14:45-15:05 | Coffee Break | |
| Chairman: Dr. K. Ota | ||
| 15:05-15:30 | Intracellular metabolism of anti-metabolites and nucleic acids in sequential chemotherapy | Dr. Minoru Sakurai |
| 15:30-15:55 | Target cell determinants of drug action and the design of clinical protocols: The example of ara-C | Dr. Enrico Mihich |
| Chairman: Dr. Y. Nomura | ||
| 15:55-16:20 | Combined chemoendocrine therapy of breast cancer: Rationale and pitfalls | Dr. Kent Osborne |
| 16:20-16:30 | Break | |
| Chairman: Dr. K. Osborne | ||
| 16:30-16:55 | Chemoendocrine therapy of breast cancer | Dr. Yasuo Nomura |
| 16:55-17:20 | Treatment of breast cancer with Bestra-bucil (estradiochlorambucil conjugate) | Dr. Nakaaki Ohsawa |
Tuesday, November 20 Chairman: Dr. E. Mihich |
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| 9:30-9:55 | Chemotherapeutic and immunotherapeutic potency of interferon-!! |
Dr. Tateshi Kataoka |
| 9:55-10:20 | Antitumor effect of an IFN-!! |
Dr. Nakao Ishida |
| 10:20-10:45 | Enhancement of cancer drug cytotoxicity by interferon | Dr. John Kovach |
| 10:45-11:05 | Coffee Break | |
| Chairman: Dr. J. Kovach | ||
| 11:05-11:30 | Combined effect of interferon and vincristine on experimental tumor and the mode of action | Dr. Tateshi Kataoka |
| 11:30-11:55 | Overview of clinical experiences with interferons in Japan | Dr. Makoto Ogawa |
| 11:55-13:30 | Noon Recess | |
| 13:30-13:55 | Summary of the role of calcium antagonists in reversal of multi-resistance of tumor | Dr. Shigeru Tsukagoshi |
| 13:55-14:20 | Effect of calcium antagonists in chemotherapy | Dr. Kazuni Sampi |
| 14:20-14:45 | Effect of calcium antagonists in clinical chemotherapy | Dr. Noboru Horikoshi |
| 14:45-15:05 | Coffee Break | |
| 15:05-15:30 | Reversal of acquired resistance of tumor to vincristine and adriamycin by addition of anthracycline derivatives which have no antitumor effect | Dr. Makoto Inaba |
| 15:30-16:00 | Characteristic function of tumor blood vessel and induced hypertension chemotherapy with angiotensin II | Dr. Haruo Sato |
| 16:00-16:15 | Discussion | |
| 16:15-16:45 | Summary and Closing Remarks | Dr. Michael Friedman |
| 16:45 | Adjourn | |
| Monday, February 25 GENUINE DRUG DEVELOPMENT TOPICS |
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| 9:00-9:05 | Welcome and Opening Remarks | Dr. M. Friedman |
| Chairman: Dr. Y. Sakurai | ||
| 9:05-9:40 | New Directions for Preclinical Screening of Antitumor Agents at the NCI | Dr. M. Boyd |
| 9:40-10:10 | Role of Hunan Tumor Cell Models in Anticancer Drug Development | Dr. B. Sikic |
| 10:10-10:40 | Potential Roles for Preclinical Pharmacology in Phase I Clinical Trials | Dr. J. Collins |
| 10:40-11:00 | Coffee Break | |
| Chairman: Dr. M. Boyd | ||
| 11:00-11:30 | Phase I Trials in Pediatric Cancer Patients: A Rationale | Dr. R. Ungerleider |
| 11:30-12:15 | Methods and Criteria of Evaluation of Clinical Trials of Anticancer Drugs | General Discussion |
| 12:15-1:15 | Lunch | |
| Chairman: Dr. K. Yamada | ||
| 1:15-1:45 | Present Status of Bone Marrow Transplantation in Japan | Dr. T. Masaoka |
| 1:45-2:15 | Design and Execution of Phase I Trials in Autologous Bone Marrow Transplantation | Dr. R. Bast |
| 2:15-2:45 | Clinical Application of Monoclonal Antibodies in Japan | Dr. R. Ueda |
| 2:45-3:00 | Coffee Break | |
| 3:00-3:30 | Current Status and Plans for Clinical Trials with BRMs in USA | Dr. R. Herberman |
| 3:30-4:00 | Interferon Studies in Japan | Dr. M. Ogawa |
| 4:00-4:20 | New Antitumor Agents under Investigation with Experimental Tumors: RA-700,!! |
Dr. Y. Sakurai |
| 4:20-4:40 | New Antitumor Antibiotics under Development in Japan | Dr. N. Tanaka |
| 4:40-5:00 | Phase I Study of 590-S, a New Fluoropyrimidine | Dr. H. Majima |
| 5:00-5:20 | Phase I-II Studies of an ara-C Analogue, PL-AC in Hematologic Malignancies | Dr. K. Yamada |
Tuesday, February 26 SPECIFIC DRUG DEVELOPMENT TOPICS Chairman: Dr. T. Masaoka |
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| 9:00-9:30 | Studies with a New Platinum Compound -- 254S in Japan | Dr. M. Ogawa |
| 9:30-10:00 | Status of Platinum Analogues Studies in USA and Europe | Dr. M. Friedman |
| 10:00-10:30 | Phase I-II Study of THP - Adriamycin in Japan | Dr. H. Majima |
| 10:30-11:00 | Coffee Break | |
| Chairman: Dr. R. Bast | ||
| 11:00-11:30 | Oral VP-16 in NH Lymphoma and Small Cell Lung Cancer | Dr. M. Ogawa |
| 11:30-12:00 | Phase I-II Studies of SM-108, an IMP-dehydrogenase Inhibitor in Hematologic Malignancies | Dr. K. Yamada |
| 12:00-12:30 | 4 Epi-Adriamycin Study in Japan | Dr. M. Ogawa and Dr. T. Masaoka |
| 12:30-1:30 | Lunch | |
| Chairman: Dr. E. Mihich | ||
| 1:30-1:45 | Phase II Study of Mitoxantrone in Acute Leukemia | Dr. T. Masaoka |
| 1:45-2:00 | Phase II-III Mitoxantrone Studies in Hematologic Malignancies | Dr. K. Yamada |
| 2:00-2:20 | Mitoxantrone Studies in Breast Cancer in Japan | Dr. M. Ogawa |
| 2:20-2:30 | Mitoxantrone Studies in the U.S. | Dr. M. Friedman |
| 2:30-3:00 | Coffee Break | |
| Chairman: Dr. M. Friedman | ||
| 3:00-3:30 | Phase I-II Drugs of Interest in U.S. | Dr. M. Friedman |
| 3:30-4:00 | New Directions for Drug Development | Dr. E. Mihich |
| 4:00-4:30 | General Discussion | |
| 4:30-4:45 | Summary and Closing | Dr. Y. Sakarai |