GHTD-amide: a naturally occurring beta cell-derived peptide with hypoglycemic activity.

In the early 1970s, a peptide fraction with insulin potentiating activity was purified from human urine but the identity and origins of the active constituent remained unknown. Here we identify the active component and characterize its origins. The active peptide was identified as an alpha amidated tetrapeptide with the sequence GHTD-amide. The peptide was synthesized and tested for stimulation of glycogen synthesis and insulin potentiation by insulin tolerance testing in insulin-deficient rats, which confirmed GHTD-amide as the active peptide. Tissue localization using a peptide-specific anti-serum and epifluorescent and confocal microscopy showed decoration of pancreatic islets but not other tissues. Confocal microscopy revealed co-localization with insulin and immunogold and electron microscopy showed localization to dense core secretory granules. Consistent with these observations GHTD-amide was found in media conditioned by MIN6 islet beta cells. Sequence database searching found no annotated protein in the human proteome encoding a potential precursor for GHTD-amide. We conclude that the insulin potentiating activity originally described in human urine is attributable to the tetrapeptide GHTD-amide. GHTD-amide is a novel peptide produced by pancreatic beta cells and no precursor protein is present in the annotated human proteome. Stimulation of glycogen synthesis and co-localization with insulin in beta cells suggest that GHTD-amide may play a role in glucose homeostasis by enhancing insulin action and glucose storage in tissues.

Young women's experiences with breast cancer: an imperative for tailored information and support.

This work was undertaken to provide a basis for determining the type of assistance young women living with breast cancer would find useful. In-depth interviews were conducted with 28 women diagnosed with breast cancer before the age of 45 years about their experiences with breast cancer. They ranged in age from 28 to 42 years at the time of diagnosis. Three overarching themes emerged from the analysis--"everything depends on acting now," "everything is out of sync," and "cancer invaded my whole life." These women shared perspectives similar to those of older women, but also held perspectives unique to being young, with young families and busy career lives. Many found services did not match their requirements and they urged the creation of services tailored to their unique needs.

Perspectives on living with ovarian cancer: older women's views.

PURPOSE/OBJECTIVES: To describe the perspectives of older women regarding their experiences living with ovarian cancer. DESIGN: Retrospective survey. SETTING: Canada. SAMPLE: 146 women, 61 years of age or older, diagnosed with ovarian cancer. METHODS: Questionnaire distributed by oncologists and nurses in 26 cancer clinics across Canada to eligible patients during a six-week period. MAIN RESEARCH VARIABLES: Patient problems experienced, help received for problems, impact of illness, quality of life, importance of and satisfaction with information received, and helpfulness of others. FINDINGS: Women experienced, on average, 5.2 problems since diagnosis. The most frequently identified problems were side effects (54%), fear of recurrence (45%), bowel difficulties (43%), and difficulty sleeping (36%). Of the women who experienced problems, the proportion who felt they received adequate help ranged from 36%-74%. Approximately half (57%) of these women reported a lifestyle change. A significant difference was observed in quality of life before and after the diagnosis of ovarian cancer (p = 0.0002). When asked about the desire to talk about their difficulties with cancer, only 54% indicated that they wanted to talk. Approximately one-quarter of the women were satisfied with the information they received regarding complementary (25%) and alternative (23%) therapies, and how to speak with other women living with ovarian cancer (28%). Thirty-five percent were satisfied with the information they received about self-help groups. CONCLUSION: Ovarian cancer has a significant impact on older women, and many perceive they are not receiving adequate assistance for problems they experience. IMPLICATIONS FOR NURSING PRACTICE: Oncology nurses should conduct comprehensive assessments of the needs of older women with ovarian cancer, refer those who require specialized counseling, and provide information desired by patients with ovarian cancer about available resources.

Mu opioid receptor efficacy and potency of morphine-6-glucuronide in neonatal guinea pig brainstem membranes: comparison with transfected CHO cells.

The major side effect of morphine and its active metabolite, morphine-6-glucuronide (M6G), is respiratory depression, which is mediated by mu opioid receptors in the medulla and pons. Although the effect of morphine on coupling between mu opioid receptors and G proteins has been studied, the effect of M6G on this coupling has not. Therefore, stimulation of guanylyl-5'-O-([gamma(35)S]-thio)-triphosphate ([(35)S]-GTPgammaS) binding by these two narcotic analgesic drugs was compared to the mu-specific synthetic opioid peptide [D-Ala(2), N-MePhe(4), Gly-ol(5)]enkephalin in Chinese hamster ovarian cells stably transfected with the murine mu opioid receptor and in brainstem membranes prepared from 3-, 7-, and 14-day-old guinea pigs. All three agonists stimulated [(35)S]-GTPgammaS binding in transfected cells and neural tissue, and the stimulation was antagonized by naloxone. In brainstem membranes, but not transfected cells, M6G was less efficacious but more potent than morphine, which may be due to differences between murine and guinea pig mu opioid receptors or in the G proteins in these two tissues. Efficacy of the agonists did not change during development, but overall potency decreased between 3 and 14 days after birth. In vivo potency differences for respiratory depression between morphine and M6G are qualitatively similar to in vitro potency differences of these drugs to stimulate [(35)S]-GTPgammaS binding in neonatal guinea pig brainstem membranes. Tolerance to opioid effects on [(35)S]-GTPgammaS binding developed in transfected cells incubated with morphine with the maximum decrease in potency occurring 18 h later than the maximum decline in efficacy.

Self-help groups: oncology nurses' perspectives.

During the past decade in North America, the number of self-help groups for cancer patients has grown dramatically. Nurses' knowledge and attitudes about self-help groups could influence their practice behaviours and the information they provide to cancer patients. However, little is known about oncology nurses' views regarding self-help groups. This study used a cross-sectional survey to gather information about knowledge, attitudes, and practice behaviours of Canadian oncology nurses regarding self-help groups. A total of 676 nurses completed the survey (response rate of 61.3%). The respondents had spent, on average, 21.6 years in nursing and 11.6 years in oncology nursing. Results indicated that a large majority of nurses knew about available self-help groups. Approximately one-fifth of the nurses are speaking frequently about self-help groups with patients (20.7%) and are initiating the conversation on a frequent basis (22.0%). Overall, oncology nurses rated self-help groups as helpful with regards to sharing common experiences (79.5%), sharing information (75.6%), bonding (74.0%), and feeling understood (72.0%). The most frequently identified concern regarding the groups was about misinformation being shared (37.9%), negative effects of associating with the very ill (22.1%), and promoting unconventional therapies (21.2%). Implications from the study suggest that oncology nurses would benefit from learning more about the nature of self-help groups and being able to talk with patients about the self-help experience.

Women's perspectives regarding the impact of ovarian cancer: implications for nursing.

Ovarian cancer is the fourth leading cause of cancer-related death in women. Ovarian cancer and its treatment have a considerable effect on the quality of life of women diagnosed with the disease. Currently, little is known about the perspectives of women regarding their experiences of living with ovarian cancer or the impact of recurrent disease. This article presents data from a national study of Canadian women living with ovarian cancer and describes the impact of the disease and its treatment. In this study, 93 women had recurrent disease, and 170 had not experienced recurrent disease. Women in both groups were similar, ranging in age from 21 to 61 years. Two-thirds of the women were married, and all were white. A greater proportion of the women with recurrent disease reported bowel problems; fears of dying, pain, getting around; and feelings of self-blame. On the average, women with recurrent disease reported experiencing more problems since diagnosis than those without recurrent disease (p = 0.01). The proportion of women who perceived that they received adequate help for their problems ranged from 20% to 85%. Implications for oncology nurses regarding assessment, referral for assistance, and patient education are apparent from the study findings.

To tell or not to tell: patterns of disclosure among men with prostate cancer.

This paper draws on the results of a longitudinal, qualitative study of men with prostate cancer (treated with prostatectomy) and their spouses. Interviews were conducted separately and simultaneously with men and their spouses, at three points in time (pre-surgery, 8-10 weeks post-surgery and 11-13 months post-surgery). The primary focus in the paper is on men's responses to questions about their decisions to share information (or not) with others about their diagnosis and ongoing medical situation. Most men with prostate cancer avoided disclosure about their illness where possible, and placed great importance on sustaining a normal life. Factors related to limiting disclosure included men's low perceived need for support, fear of stigmatization, the need to minimize the threat of illness to aid coping, practical necessities in the workplace, and the desire to avoid burdening others. This study contributes to an understanding of disclosure issues related to prostate cancer, and raises issues about how best to be helpful to men, given their tendency to minimize the impact of illness, and the need for support.

Changing physicians' attitudes toward self-help groups: an educational intervention.

BACKGROUND: Members of self-help groups (SHGs) for support of cancer patients are concerned that physicians are skeptical about these groups and see them as potentially harmful. The purpose of this study was to assess family physicians' attitudes towards self-help groups and see whether these could be changed through an educational intervention. METHODS: A questionnaire assessing attitudes toward SHGs was mailed to 1,422 eligible Ontario family physicians, to which 911 responded (64% response rate). Responders were sent an educational package consisting of an article about self-help groups, a list of local cancer self-help groups, and a follow-up questionnaire. RESULTS: The study was completed by 584/911 family physicians (64%). After being exposed to educational material, the physicians were more positive about the helpfulness of SHGs (p = 0.021), and less concerned about SHGs' being harmful (p = 0.003). They were more positive about the potential for SHGs to provide participants with opportunities for: sharing information (p = 0.004), bonding with other patients (p < 0.001), feeling understood (p = 0.004), sharing common experiences (p = 0.004), providing hope (p < 0.001), sharing laughter (p = 0.001), becoming more assertive (p < 0.001), communicating with health professionals (p = 0.04), dealing with issues related to death and dying (p = 0.005), advocacy (p = 0.01), and overcoming isolation (p = 0.002). They were less concerned with the potential for SHGs to provide misinformation (p = 0.003), the negative effects of associating with the very ill (p = 0.002), dwelling on illness (p = 0.002), or cultivating false hope (p = 0.001). CONCLUSION: Having family physicians complete a questionnaire, followed by educational material specific to their concerns, changed their attitudes toward self-help groups. Further study is needed to see whether behavioral changes resulted.

A qualitative study of patient perspectives on colorectal cancer.

OBJECTIVES: The purpose of this study was to use qualitative methods to contribute to a complete patient perspective on the psychosocial impact of colorectal cancer. MATERIALS AND METHODS: A qualitative descriptive study was conducted in 20 patients attending a gastrointestinal follow-up clinic at the Toronto-Sunnybrook Regional Cancer Centre. The data documented included patient satisfaction and perceptions regarding to quality of care, information received, involvement in decision making, and long-term management of the illness. RESULTS: Overall, patients were satisfied with their treatment, including the quality and timeliness of the information they received, the quality of their healthcare, and the level of involvement in decision making. However, some patients were dissatisfied with information concerning long-term management of their illness. Patient care, including information and social support, was provided by cancer specialists, family physicians, family, and friends. Patients looked to cancer specialists as their primary source of information, but relied on family physicians to fill in gaps in understanding, to provide support, to manage overall care, and to act as a sounding board for ideas and treatment options. Social support was also provided by family and friends. All patients had a relatively positive outlook on their illness experience, although those with colostomies had some added difficulty. Despite the focus on positive change, many patients acknowledged difficulty coping with the side effects of treatment. CONCLUSIONS: These data indicate that patient information needs to be provided in the most common terms and the most straightforward language. Information also may need to be repeated and should include attention to long-term management of the illness. Health professionals should assume that patients may have difficulty in illness management and should encourage a discussion of patients' concerns.

Utilization of professional supportive care services by women with breast cancer.

This paper reports on the results of a survey of utilization of professional supportive care services by women with breast cancer, and on patterns of differential service utilization by sub-groups of patients. Study participants were women with invasive breast cancer diagnosed 23-36 months prior to contact about the study, and randomly selected from the Ontario Cancer Registry. From among 1,119 eligible women sent survey questionnaires, 731 returned completed questionnaires (65%). A total of 31% of respondents reported accessing one or more of the following professionals: social worker, psychologist, psychiatrist, dietitian, physiotherapist. Among those who responded to a question about whether they would have liked specific services, 34% reported that there was at least one professional supportive care service they would have liked to use, but were unable to access. Factors shown to be related to greater utilization of services included: younger age, higher household income, employed or student status, private health insurance coverage, and having received chemotherapy. Overall, there was a surprisingly low utilization of professional specialized supportive care services among women with breast cancer. Policy implications include finding strategies to better inform cancer patients about existing services, and ensuring that a core set of services are available to all patients.

Perspectives on living with ovarian cancer: young women's views.

Ovarian cancer is the fourth leading cause of cancer-related deaths in women. Ovarian cancer, and its treatment, has a considerable effect on the quality of life of women diagnosed with the disease. Young women diagnosed with ovarian cancer must confront life-threatening illness at a time when many are in the midst of raising children, maintaining a household, and actively engaging in work and career activities. Very little has been reported about the perspectives of young women regarding their experiences with ovarian cancer. This article reports data from 39 women 45 years of age or less concerning the impact of ovarian cancer and its treatment as well as the availability of support. At the time of the study, the women were, on average, 38 years of age and approximately two-thirds were married and had children. About half of the women were working. The most frequently identified problems included side effects (n = 25), fear of recurrence (n = 25), and difficulty sleeping (n = 25). On average, women reported experiencing 10.4 problems since diagnosis. Of those who experienced problems, less than 50% perceived they had received adequate help. Approximately two-thirds of these women experienced a lifestyle change. Quality of life was rated significantly lower following their experience with ovarian cancer. Implications for oncology nurses emerge in areas of assessment, referral, and patient teaching.

Early postsurgery experience of prostate cancer patients and spouses.

PURPOSE: The authors describe the experience of men with prostate cancer and their spouses in the early recovery period after surgery. DESCRIPTION OF STUDY: As part of a longitudinal qualitative study, semistructured interviews were held with 34 patients who had prostate cancer and their spouses 8 to 10 weeks after surgery. RESULTS: Five components of experience emerged from the interviews: 1) hearing news about the extent of their cancer after surgery influenced how patients viewed their cancer experience and, in many cases, their recovery; 2) men placed great emphasis on recovering their physical capacity quickly; 3) couples connected with each other through working out care routines and managing periods of irritability; 4) couples described a range of responses to surgery side effects and complications; and 5) the meaning of cancer varied for couples, with most seeing the experience as a temporary disruption. CLINICAL IMPLICATIONS: Physicians, nurses, social workers, and other health professionals working with patients before and after prostatectomies may assist couples to prepare better for the early recovery period by being both sensitive to the men's need to recover physical capacity quickly while helping them to understand that recovery takes time. Accurate information about expected periods of irritability, side effects, and possible complications would diminish the likelihood of distress during this period.

Managing the Impact of Illness: The Experiences of Men with Prostate Cancer and their Spouses.

This qualitative study explored issues of support and coping for couples where the man had been diagnosed with prostate cancer. Thirty-four men with prostate cancer and their spouses were interviewed separately at three points in time: prior to surgery; 8 to 10 weeks post-surgery; and 11 to 13 months post-surgery. The core category for the couples' experience with diagnosis and treatment for prostate cancer was Managing the Impact of Illness. Five major domains emerged, including: dealing with the practicalities; stopping illness from interfering with everyday life; keeping relationships working; managing feelings; and making sense of it all. While it was clearly important for couples to manage illness and to reduce its potential intrusion into everyday life, this strategy had psychological costs as well as benefits. Men struggled to stay in control of their emotions and their lives, typically vacillating between the pulls of fierce self-reliance and fearful neediness. Women were constrained from employing their usual strategies of coping and were distressed by the complicated requirements of being supportive while also honoring their partners' need for self-reliance.

Canadian women's perspectives on ovarian cancer.

OBJECTIVE: To describe the perspectives of Canadian women living with ovarian cancer regarding their experiences with the disease. DESIGN: A cross-sectional survey of a convenience sample of Canadian women with ovarian cancer. SETTING: Survey questionnaires were sent to physicians in 26 cancer programs that treat women with ovarian cancer and to ovarian cancer self-help groups for subsequent distribution to women. PARTICIPANTS: Women diagnosed with ovarian cancer and able to read English or French. MAIN OUTCOME MEASURES: A variety of individual items in the survey related to information received, communication, physical and psychosocial symptoms, impact of illness and quality of life. RESULTS: A total of 315 women returned the survey. The average age of the respondents is 59 years. Each province and territory is represented in the sample. Over one-half of the women received a diagnosis of ovarian cancer within a month of seeking help for a concern and 85% had multiple treatment modalities. The majority of the women felt adequately informed (80%) and were satisfied with communication with their physicians (mean of 4.1 to 4.5 on a 5-point scale). A majority (62%) said that their lifestyle had changed as a result of their disease. Problems were experienced most frequently regarding side effects (58%), fear of recurrence (54%), sleeping difficulties (46%), bowel difficulties (44%), fear of dying (36%) and difficulty concentrating (32%). Many who experienced problems reported receiving inadequate help for them (16% to 49%). Quality of life was reported as significantly lower following the diagnosis and treatment of ovarian cancer (p = 0.0001). CONCLUSION: This study provides an important foundation for further investigation. There is a pressing need for research regarding the early identification of ovarian cancer and issues of support and coping. Care for women with ovarian cancer requires the expertise of a range of disciplines and community-based agencies working collaboratively as a team.

Family physicians' perspectives on ovarian cancer.

OBJECTIVE: To describe the knowledge, practices and perspectives of Canadian family physicians regarding ovarian cancer. DESIGN: A mailed survey questionnaire was followed by a reminder card, a second mailing of the questionnaire and a final reminder card. SETTING: A national sample of family physicians was drawn randomly from the membership database of the College of Family Physicians of Canada. MAIN OUTCOME MEASURES: Knowledge related to ovarian cancer. Practices related to the screening and detection of ovarian cancer. Attitudes towards screening for ovarian cancer. Perceived role in the care of women at risk of, or diagnosed with, ovarian cancer. Perceived educational needs of physicians. RESULTS: A total of 1079 completed questionnaires were returned, providing a response rate of 56.6%. Although most family physicians were aware of the basic facts about ovarian cancer, there were knowledge limitations related to risk factors, familial ovarian cancer syndromes and symptoms. Practices related to asymptomatic women were found to be mostly in accord with current guidelines and recognized the prevailing lack of evidence for the effectiveness of tests. Areas that were troublesome included the role of screening in high-risk women and knowledge about available tests. Most family physicians indicated that they have an important role to play in the care of women after they have been diagnosed with ovarian cancer. They also expressed a high level of interest in obtaining additional information related to ovarian cancer. CONCLUSIONS: This study clearly shows that there is a need for additional research to assist with the development of evidence-based guidelines for women at increased risk of ovarian cancer and for women at no known risk. Pending more definitive evidence, interim guidelines could provide assistance to physicians currently having to make decisions in a context of massive uncertainty. Canadian family physicians would be interested in and would benefit from continuing medical education (CME) initiatives concerning ovarian cancer.

Gynecologists' perspectives regarding ovarian cancer.

OBJECTIVE: To document the perspectives, practices and knowledge of Canadian gynecologists regarding ovarian cancer. DESIGN: A mailed survey questionnaire was followed by a reminder card and a second mailing of the questionnaire. SETTING: A sample of all gynecologists practising in Canada. MAIN OUTCOME MEASURES: Knowledge related to ovarian cancer. Practices related to the screening and detection of ovarian cancer. Attitudes towards ovarian cancer. Perceived role in the care of women at risk of, or diagnosed with, ovarian cancer. Perceived educational needs of gynecologists regarding ovarian cancer. RESULTS: A total of 504 completed questionnaires were returned, providing a response rate of 46%. Most gynecologists indicated that they knew the basic facts about ovarian cancer and risk factors. Practices related to asymptomatic, low-risk women were found to be mostly in accord with current guidelines and the lack of evidence for the effectiveness of tests. Practices regarding women with suspected early or late-stage ovarian cancer varied, particularly with regard to referral to gynecologic oncologists. Many respondents indicated that they have an important role to play in the care of women after they have been diagnosed with ovarian cancer or referred to another specialist. Respondents also expressed interest in obtaining additional information about ovarian cancer. CONCLUSIONS: This study shows that there is a need for the development and dissemination of evidence-based guidelines regarding ovarian cancer. It also pinpoints areas where educational efforts could be directed.

Complementary health practitioners' attitudes, practices and knowledge related to women's cancers.

OBJECTIVE: To document the attitudes, practices and knowledge of 3 groups of complementary practitioners (naturopathic doctors, chiropractors and massage therapists) regarding women's cancers in general and ovarian cancer specifically. DESIGN: A mailed survey questionnaire was followed by a reminder card and a second mailing of the questionnaire. SETTINGS: National samples were obtained for naturopathic doctors and chiropractors. The massage therapist sample was drawn from Ontario only because of the absence of a national listing of massage therapists. MAIN OUTCOME MEASURES: Practitioners reported response to patients' suspicious symptoms. Practitioners' perceptions of patients' motivations for seeking treatment. Practitioners' satisfaction with interactions with conventional practitioners. Practitioners' perceptions of their role in the care of women at risk of, or diagnosed with, cancer. Practitioners' perceptions of their knowledge regarding women's cancers. Practitioners' knowledge specific to ovarian cancer. RESULTS: A total of 894 completed questionnaires were returned, providing a response rate of 56%. The vast majority of practitioners who saw women with symptoms possibly related to cancer referred them to a family physician or a cancer specialist. Motivations that practitioners most frequently heard expressed by women seeking complementary treatments were "maximizing quality of life," "seeking natural approaches to healing" and "looking to stay well when disease is in remission." Most respondents were dissatisfied with patient-related communication with both family physicians and cancer specialists. The majority of complementary practitioners indicated that they have an important role to play in the postdiagnostic care of women with cancer. Considerable interest was expressed in further education concerning ovarian cancer. CONCLUSIONS: Whereas the professions reached through this survey differ in important ways from each other, they share an interest in being involved in the care of women with cancer, as well as an enthusiasm for the development of continuing professional education programs to help them better serve their clients.

Presurgery experiences of prostate cancer patients and their spouses.

PURPOSE: In this article, the authors describe the experiences of men with prostate cancer and their spouses between diagnosis and surgery. DESCRIPTION: As part of a longitudinal qualitative study, semistructured interviews were held with 34 prostate cancer patients who were waiting for surgery. Separate interviews were held with their spouses. RESULTS: Six main components of experience were evident from the analysis of transcripts related to the presurgery period: 1) the news of a diagnosis of prostate cancer came initially as a shock for both partners, the impact of which lessened over time; 2) the new reality of illness necessitated readdressing the marital relationship, most often resulting in a sense of renewed connection and commitment; 3) the illness crisis precipitated a search for information to guide decisions about treatment; 4) there was a need for couples to decide who to inform about the cancer diagnosis and how much to say about it; 5) couples attempted to seek a semblance of normality in their lives, especially after treatment decisions had been made; and 6) despite attempts to minimize the potential impact of upcoming surgery, anxiety was typically experienced at least intermittently by one or both partners. CLINICAL IMPLICATIONS: Physicians, nurses, social workers, and other health professionals need to facilitate attempts by the patient to gather and synthesize information. Cancer specialists can play a positive role in reducing distress in couples, and, thus, the attention of the specialists to communication issues is critical. The strain of waiting for surgery must be considered when treatment recommendations are made; watchful waiting protocols require further study from a psychological perspective. Clinicians need to be alert to the balance between being positive and carrying on as normal, and acknowledging and dealing with the distress that arises.

Nurses' perspectives on unconventional therapies.

Unconventional therapies have become increasingly popular with health care consumers in recent years. As patients seek information and attempt to make decisions about unconventional therapies, they often turn to nurses, asking the nurse's opinion about certain therapies. The nurse's attitudes and beliefs about unconventional therapies quite likely will influence the response to the patient's inquiries. This article represents the findings of interviews with 20 nurses regarding their perspectives on unconventional therapies. Without exception, all nurses who were interviewed emphasized that information regarding unconventional therapies needs to be available readily for both patients and health care professionals. Other themes identified in the interviews included the following: Various people use unconventional therapies; people seek unconventional therapies for a variety of reasons; communication about unconventional therapies needs to be open, and a place should be found for unconventional therapies. The interviewees saw a clearly defined role for nurses regarding unconventional therapies.