There is substantial evidence that oncogenes (v-onc) of acute transforming retroviruses have been acquired by transduction of cellular genes (c-onc) with retroviruses. Feline leukaemia virus (FeLV)-associated feline fibrosarcomas have proven to be extremely useful for the isolation of acute transforming retroviruses of a mammalian species. Three different v-onc genes have been identified in five acute transforming feline retroviruses. The Susan McDonough feline sarcoma virus (SMFeSV) contains the oncogene fms (ref. 4). The Snyder-Theilen (ST) and Gardner-Arnstein (GA) FeSVs contain the oncogene fes (ref. 4), which is homologous to the oncogene fps of the avian sarcoma viruses FSV, RRCII, PRCIV and 16L (refs 7, 8). The v-onc sequences of the Parodi-Irgens (PI) FeSV have recently been found to be homologous with the v-sis sequences of the simian sarcoma virus. We report here the isolation of another acute transforming feline retrovirus from a naturally occurring feline fibrosarcoma, designated the Hardy-Zuckerman 2 feline sarcoma virus (HZ2-FeSV) and demonstrate that the HZ2-FeSV and Abelson murine leukaemia virus (A-MuLV) have homologous oncogenes.
This article discusses the potential for shared mental models to improve teamwork during discharge planning and follow-up care. A 58-year-old inpatient on the hematology care unit of an academic medical center was discharged to his community after initial treatment of acute myeloid leukemia, without a clear plan for either discharge or follow-up. This case highlights the challenges faced by the primary oncology care team, the patient's community health-care team, the patient, and his caregiver, because a formal plan for follow-up care after discharge was not in place. The lack of communication within the oncology care team and between the medical center and community care teams that leads to the gap in continuity of care between inpatient and outpatient oncology settings could be addressed at least in part by establishing a shared mental model. This model would require all individuals involved in patient care to recognize they are part of a team. Furthermore, all members of the interdisciplinary discharge team need to understand their own roles and responsibilities as well as those of the other team members, including the need for communication and how their roles and activities affect those of other team members. Tools such as huddles, checklists, and patient education could be used to help the team recognize and achieve its goals. Ideally, this shared mental model could be extended to include the community health-care team, leading to a more fluid transition between inpatient and outpatient care, improving patient satisfaction, and likely improving patient outcomes.
Appropriately selected phylogenetic models are capable of providing insight into genetic mechanisms which may have become obscured during the passage of evolutionary time. In higher vertebrates a complex multigenic family encodes immunoglobulin-variable regions. The mechanisms involved in the expansion of the gene family and the stable maintenance of large numbers of individual genes presently are not understood. By defining the nature of antibody diversity in lower vertebrate species, it may be possible to approach such issues at a more fundamental level. Analyses of the immunoglobulins in Heterodontus francisci (horned shark), a representative phylogenetically primitive elasmobranch, indicate that this species may represent a useful developmental model.
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