RESUMEN
OBJECTIVES: To obtain insight into patients' reasons for medication (non)adherence in chronic myeloid leukaemia (CML) and needs and wishes regarding information and communication. METHODS: A mixed-method study on the basis of a questionnaire and semi-structured interviews. The CML patient advocacy group asked patients to participate. RESULTS: Sixty-one patients (54 ± 12 years, 43% male) using imatinib, dasatinib or nilotinib participated. Fifteen patients (25%) reported to miss an intake at least once a month. Most were not worried about missing an intake and did not discuss missed intakes with their healthcare provider (HCP). Social activities disturbing daily routines and the wish to avoid side effects resulted in nonadherence. Patients wanted extensive and understandable information provided timely on all aspects of CML treatment, in particular on side effects, and a more supportive HCP attitude. CONCLUSIONS: Nonadherence to CML medication does not cause concern in all patients and is not discussed pro-actively. HCP have a clear role in supporting medication adherence in CML and must be aware that social activities disturbing daily routines contribute to nonadherence. HCP should discuss (non)adherence in a direct manner, motivate patients to play an active role in managing their medication and timely provide extensive and understandable information on all aspects of CML.
RESUMEN
Positron emission tomography (PET) with 89Zr-labeled monoclonal antibodies (mAbs) or other targeted vehicles (e.g., peptides, nanoparticles and cells), collectively called "89Zr-immuno-PET", can be used for better understanding of disease targets and the in vivo behavior of targeted drugs. This will become increasingly important in the development of next generation mAbs, which are characterized by high potency and/or multiple binding domains. This review provides practical information for researchers who want to implement 89Zr-immuno-PET for answering their own biological and pathological questions or for steering their own drug development program. An overview is given of the reagents, labeling protocols, quality tests and critical steps to come to high quality 89Zr-conjugates, while possibilities for further improvement are discussed. Since PET has the advantage of allowing quantitative imaging, information is provided about standardization of 89Zr quantification. Issues are summarized for consideration when starting preclinical or clinical 89Zr-immuno-PET studies, to enable at the end unequivocal interpretation of results. Finally, many appealing examples are provided of what can be learned from 89Zr-immuno-PET studies, while future directions are outlined. Most of the current examples are still on the characterization of mAbs in oncology, but the review will show that 89Zr-immuno-PET harbors potential for many kinds of targeted drugs and diseases, as well as for elucidating biological processes.
Asunto(s)
Neoplasias/diagnóstico por imagen , Radioisótopos/inmunología , Circonio/inmunología , Anticuerpos Monoclonales/inmunología , Sistemas de Liberación de Medicamentos/métodos , Humanos , Marcaje Isotópico/métodos , Neoplasias/inmunología , Tomografía de Emisión de Positrones/métodos , Radiofármacos/inmunologíaRESUMEN
BACKGROUND: Clinical positron emission tomography (PET) requires safe and effective PET radiopharmaceuticals. Tracers used for measuring oxygen consumption and blood volume are [(15)O]O(2) and [(15)O]CO, respectively. In general, these oxygen-15 labelled tracers are produced using a cyclotron that accelerates deuterons onto a target filled with (14)N(2) containing a trace of oxygen. In recent years, cyclotrons have been developed that only are capable of accelerating protons. The purpose of this study was to validate and assess such a cyclotron for production and administration of oxygen-15 labelled gasses in an hospital setting. METHODS: An RDS111 cyclotron (Siemens-CTI, Knoxville, USA) was validated for bolus production of [(15)O]O(2) and [(15)O]CO gasses. In addition, equipment was developed to administer these tracers to patients. RESULTS: Both [(15)O]O(2) and [(15)O]CO gasses could be produced in sufficient amounts, whilst meeting European Pharmacopeia requirements. Although produced oxygen-15 gasses contained a minor level of (11)C contamination, in clinical studies it was possible to correct for this contamination by delayed blood counting. CONCLUSION: An 11 MeV proton cyclotron combined with an in-house developed gas delivery system allows for the production and administration of sufficient amounts of [(15)O]-gasses for routine clinical PET studies in an hospital setting.