Ovarian cancer stage, variation in transvaginal ultrasound examination rates and the impact of an urgent referral pathway: A national ecological cohort study.

INTRODUCTION: The aim of this study was to determine whether variation in transvaginal ultrasound examination rates in Danish general practice populations is associated with ovarian cancer outcomes, and to explore the impact of the introduction of a cancer patient pathway for ovarian cancer. MATERIAL AND METHODS: We performed a national register-based cohort study of gynecological cancer-free women aged 40 years or above, living in Denmark and listed with a specific general practitioner in 2004-2014. Practice populations were divided into quartiles according to the general practitioners' transvaginal ultrasound propensity in the preceding year. Associations between transvaginal ultrasound rates and ovarian cancer outcomes were analyzed using Poisson and logistic regression. RESULTS: We included 2769 general practices with 1 739 422 listed women, of whom 5325 were diagnosed with ovarian cancer during the study period. Practices varied twofold in transvaginal ultrasound rates before and after the implementation of the cancer patient pathway. Before the cancer patient pathway was introduced, women listed with practices with the highest transvaginal ultrasound rates were diagnosed with earlier stages of ovarian cancer (odds ratio 1.38, 95% confidence interval 1.06 to 1.81) and had a higher proportion of borderline tumors (incidence rate ratio 1.38, 95% confidence interval 1.10 to 1.75) compared with women least exposed to transvaginal ultrasound. After the cancer patient pathway, no significant differences were identified between the groups. CONCLUSIONS: Before the cancer patient pathway, women exposed most to transvaginal ultrasound were significantly more likely to be diagnosed with early stage ovarian cancer compared with those least exposed to transvaginal ultrasound. After the cancer patient pathway was implemented, the difference disappeared. This suggests that increased awareness and access to transvaginal ultrasound is useful for diagnosing early-stage ovarian cancer.

Propensity for paying home visits among general practitioners and the associations with cancer patients' place of care and death: a register-based cohort study.

BACKGROUND: Previous studies of associations between home visits by general practitioners and end-of-life care for cancer patients have been subject to confounding. AIM: To analyse associations between general practitioners' propensity to pay home visits and the likelihood of hospitalisation and dying out of hospital among their cancer patients. DESIGN: A national register cohort study with an ecological exposure. Standardised incidence rates of general practitioner home visits were calculated as a measure for propensity. Practices were grouped into propensity quartiles. Associations between propensity groups and end-of-life outcomes for cancer patients aged 40 or above were calculated. SETTING/PARTICIPANTS: Danish general practitioners and citizens aged 40 or above were included from 2003 to 2012. RESULTS: We included 2670 practices with 2,518,091 listed patients (18,364,679 person-years); of whom 116,677 died from cancer. General practitioners were grouped into quartiles based on the general practitioners' propensity to pay home visits, which varied 6.6-fold between quartiles. Cancer patients in Group 4 (highest propensity) were less hospitalised than patients in Group 1 (lowest propensity): odds ratio: 1.13 (95% confidence interval: 1.08; 1.17) for ⩽3 bed-days and odds ratio: 0.95 (0.91-0.99) for ⩾20 bed-days. Group 4 patients were more likely to die out of hospital (odds ratio: 1.20 (1.16; 1.24)) than Group 1 patients. CONCLUSION: We found a dose-response-like association between general practitioners' higher propensity to pay home visit and their patients' likelihood of less end-of-life hospitalisation and more often dying out of hospital.

Increased diagnostic activity in general practice during the year preceding colorectal cancer diagnosis.

Accurate diagnostic activity in general practice before colorectal cancer (CRC) diagnosis is crucial for an early detection of CRC. This study aimed to investigate the rates of daytime consultations, hemoglobin (Hb) measurements and medicine prescriptions for hemorrhoids in general practice in the year preceding CRC diagnosis. Using Danish registries, we conducted a population-based matched cohort study including CRC patients aged 40-80 years (n = 19,209) and matched references (n = 192,090). We calculated odds ratios (ORs) using a conditional logistical regression model and incidence rate ratios (IRRs) using a negative binomial regression model. The CRC patients had significantly more consultations from 9 months before diagnosis and significantly increased rates of Hb measurements from up to 17 months before diagnosis compared with references. Furthermore, up to 18 months before diagnosis, CRC patients had significantly higher rates of prescriptions for hemorrhoids; and 2 months before diagnosis, the IRR was 12.24 (95% confidence interval (CI): 10.29-14.55) for men. The positive predictive value (PPV) of CRC for having a first-time prescription for hemorrhoids was highest among men aged 70-80 years [PPV = 3.2% (95% CI: 2.8-3.7)]. High prescription rates were predominantly seen among rectal cancer patients, whereas colon cancer patients had higher rates of consultations and Hb measurements. This study revealed a significant increase in healthcare seeking and diagnostic activity in general practice in the year prior to CRC diagnosis, which indicates the presence of a "diagnostic time window" and a potential for earlier diagnosis of CRC based on clinical signs and symptoms.

Variation in general practice prostate-specific antigen testing and prostate cancer outcomes: an ecological study.

Knowledge is sparse about the consequences of variation in prostate-specific antigen (PSA) testing rates in general practice. This study investigated associations between PSA testing and prostate cancer- related outcomes in Danish general practice, where screening for prostate cancer is not recommended. National registers were used to divide general practices into four groups based on their adjusted PSA test rate 2004-2009. We analysed associations between PSA test rate and prostate cancer-related outcomes using Poisson regression adjusted for potential confounders. We included 368 general practices, 303,098 men and 4,199 incident prostate cancers. Men in the highest testing quartile of practices compared to men in the lowest quartile had increased risk of trans-rectal ultrasound (incidence rate ratio (IRR): 1.20, 95% CI, 0.95-1.51), biopsy (IRR: 1.76, 95% CI, 1.54-2.02), and getting a prostate cancer diagnosis (IRR: 1.37, 95% CI, 1.23-1.52). More were diagnosed with local stage disease (IRR: 1.61, 95% CI, 1.37-1.89) with no differences regarding regional or distant stage. The IRR for prostatectomy was 2.25 (95% CI, 1.72-2.94) and 1.28 (95% CI, 1.02-1.62) for radiotherapy. No differences in prostate cancer or overall mortality were found between the groups. These results show that the highest PSA testing general practices may not reduce prostate cancer mortality but increase the downstream use of diagnostic and surgical procedures with potentially harmful side effects.

Healthcare use and clinical investigations before a diagnosis of ovarian cancer: a register-based study in Denmark.

BACKGROUND: Ovarian cancer (OC) is associated with a poor prognosis, which calls for earlier diagnosis. This study aimed to analyse the health care use in primary care and at hospitals among women with OC compared to non-cancerous women to identify a window of opportunity for earlier diagnosis. METHODS: This nationwide register-based observational cohort study included all Danish women aged ≥ 40 years who were diagnosed with a first-time OC or borderline ovarian tumour in 2012-2018 and with no previous cancer diagnosis (n = 4,255). For each case, ten non-cancerous women were identified (n = 42,550). We estimated monthly incidence rate ratios using a negative binomial regression model to assess the use of health care services. We calculated risk ratios of having multiple contacts to general practice before a diagnosis using a binary regression model. RESULTS: Cases had statistically significantly higher contact rates to general practice from five months prior to the diagnosis compared to references. From six to eight months prior to diagnosis, an increased use of transvaginal ultrasound and gynaecologist was seen for cases compared to references. CONCLUSIONS: Increased healthcare use was seen relatively closely to the time of diagnosis for women with OC. This indicates a narrow window of opportunity for a timelier diagnosis. Still, the use of specialised assessment increased at six to eight months before the diagnosis. When women present unspecific symptoms, awareness of potential ovarian malignancies and safety-netting by the general practitioner may be pivotal. TRIAL REGISTRATION: Not relevant.

Abdominal symptoms and cancer in the abdomen: prospective cohort study in European primary care.

BACKGROUND: Different abdominal symptoms may signal cancer, but their role is unclear. AIM: To examine associations between abdominal symptoms and subsequent cancer diagnosed in the abdominal region. DESIGN AND SETTING: Prospective cohort study comprising 493 GPs from surgeries in Norway, Denmark, Sweden, Scotland, Belgium, and the Netherlands. METHOD: Over a 10-day period, the GPs recorded consecutive consultations and noted: patients who presented with abdominal symptoms pre-specified on the registration form; additional data on non-specific symptoms; and features of the consultation. Eight months later, data on all cancer diagnoses among all study patients in the participating general practices were requested from the GPs. RESULTS: Consultations with 61 802 patients were recorded and abdominal symptoms were documented in 6264 (10.1%) patients. Malignancy, both abdominal and non-abdominal, was subsequently diagnosed in 511 patients (0.8%). Among patients with a new cancer in the abdomen (n = 251), 175 (69.7%) were diagnosed within 180 days after consultation. In a multivariate model, the highest sex- and age-adjusted hazard ratio (HR) was for the single symptom of rectal bleeding (HR 19.1, 95% confidence interval = 8.7 to 41.7). Positive predictive values of >3% were found for macroscopic haematuria, rectal bleeding, and involuntary weight loss, with variations according to age and sex. The three symptoms relating to irregular bleeding had particularly high specificity in terms of colorectal, uterine, and bladder cancer. CONCLUSIONS: A patient with undiagnosed cancer may present with symptoms or no symptoms. Irregular bleeding must always be explained. Abdominal pain occurs with all types of abdominal cancer and several symptoms may signal colorectal cancer. The findings are important as they influence how GPs think and act, and how they can contribute to an earlier diagnosis of cancer.

The completeness of chest X-ray procedure codes in the Danish National Patient Registry.

OBJECTIVE: The aim of this validation study was to assess the completeness of the registrations of chest X-rays (CXR) in two different versions of the Danish National Patient Registry (DNPR). MATERIAL AND METHODS: We included electronic record data on CXR performed on patients aged 40 to 99 years from nine radiology departments covering 20 Danish hospitals. From each department, we included data from three randomly selected weeks between 2004 and 2011 (reference standard). In two versions of the DNPR from the State Serum Institute (SSI) and Statistics Denmark, respectively, we investigated the proportion of registered CXR compared to the reference standard. Furthermore, we compared the completeness of the recorded data according to the responsible department (main department). RESULTS: We identified 11,235 patients and 12,513 CXR in the reference standard. The data from the SSI contained 12,265 (98%) CXR, whereas the data from Statistics Denmark comprised 9,151 (73.1%) CXR. The completeness of the SSI data was fairly constant across years, radiology departments, medical specialties, and age groups. The data from Statistics Denmark was almost complete in 2011 (95.8%). However, for the remaining study period, the data with radiology departments registered as the main department were lacking in the version from Statistics Denmark, and so the overall completeness was 73.1%. CONCLUSION: The completeness of CXR registrations varied between 98% and 73% depending on the information source, and this should be considered when investigating radiology services in the basis of DNPR.

Abdominal symptoms in general practice: Frequency, cancer suspicions raised, and actions taken by GPs in six European countries. Cohort study with prospective registration of cancer.

BACKGROUND: Abdominal symptoms are diagnostically challenging to general practitioners (GPs): although common, they may indicate cancer. In a prospective cohort of patients, we examined abdominal symptom frequency, initial diagnostic suspicion, and actions of GPs in response to abdominal symptoms. METHODS: Over a 10-day period, 493 GPs in Norway, Denmark, Sweden, Belgium, the Netherlands, and Scotland, recorded consecutive consultations: sex, date of birth and any specified abdominal symptoms. For patients with abdominal symptoms, additional data on non-specific symptoms, GPs' diagnostic suspicion, and features of the consultation were noted. Data on all cancer diagnoses among all included patients were requested from the GPs eight months later. FINDINGS: Consultations with 61802 patients were recorded. Abdominal symptoms were recorded in 6264 (10.1%) patients. A subsequent malignancy was reported in 511 patients (0.8%): 441 (86.3%) had a new cancer, 70 (13.7%) a recurrent cancer. Abdominal symptoms were noted in 129 (25.2%) of cancer patients (P < 0.001), rising to 34.5% for the 89 patients with cancer located in the abdominal region. PPV for any cancer given any abdominal symptom was 2.1%. In symptomatic patients diagnosed with cancer, GPs noted a suspicion of cancer for 85 (65.9%) versus 1895 (30.9%) when there was no subsequent cancer (P < 0.001). No suspicion was noted in 32 (24.8%) cancer patients. The GP's intuitive cancer suspicion was independently associated with a subsequent new cancer diagnosis (OR 2.11, 95% CI 1.15-3.89). Laboratory tests were ordered for 45.4% of symptomatic patients, imaging for 10.4%, referral or hospitalization for 20.0%: all were more frequent in subsequent cancer patients (P < 0.001). INTERPRETATION: Abdominal symptoms pointed to abdominal cancers rather than to other cancers. However, the finding of abdominal symptoms in only one third of patients with an abdominal cancer, and the lack of cancer suspicion in a quarter of symptomatic cancer patients, provide challenges for GPs' diagnostic thinking and referral practices.

Patients with cancer and change of general practice: a Danish population-based cohort study.

BACKGROUND: General practice plays an important role in the cancer care pathway. Patient dissatisfaction with the diagnostic process may be expressed by changing to another general practice. AIM: To compare the frequency of change of practice (COP) in patients with cancer (n = 150 216) with a matched cancer-free control cohort (n = 1 502 114) and to analyse associations with cancer type and patient characteristics. DESIGN AND SETTING: A population-based matched cohort study using historical and prospectively collected data from Danish nationwide registers. METHOD: COP was defined as a change of practice list, unrelated to change of address or reorganisation of the practice. Data were analysed monthly in the year before and after a cancer diagnosis. RESULTS: More patients with cancer than controls changed general practice (4.1% versus 2.6%) from 7 months before and until 12 months after diagnosis. The COP rate varied by cancer type (rectal cancer served as reference). Before the diagnosis, COP was most often seen among patients with ovarian cancer (risk ratio [RR] 1.51, 95% confidence interval [CI] = 1.10 to 2.08) and multiple myeloma (RR 1.89, 95% CI = 1.34 to 2.67). After the diagnosis, COP was most frequent among patients with brain cancer (RR 1.38, 95% CI = 1.05 to 1.82) and ovarian cancer (RR 1.51, 95% CI = 1.21 to 1.88). CONCLUSION: Patients with cancer changed general practice more frequently than the cancer-free controls. COP variations between cancer types may be attributed to lack of diagnostic timeliness due to clinical complexity of the diagnosis and the role of the GP in the diagnostic process.

Predictive values of GPs' suspicion of serious disease: a population-based follow-up study.

BACKGROUND: Knowledge is sparse on the prevalence of suspicion of cancer and other serious diseases in general practice. Likewise, little is known about the possible implications of this suspicion on future healthcare use and diagnoses. AIM: To study the prevalence of GPs' suspicions of cancer or other serious diseases and analyse how this suspicion predicted the patients' healthcare use and diagnoses of serious disease. DESIGN AND SETTING: Prospective population-based cohort study of 4518 patients consulting 404 GPs in a mix of urban, semi-urban and rural practices in Central Denmark Region during 2008-2009. METHOD: The GPs registered consultations in 1 work day, including information on their suspicion of the presence of cancer or another serious disease. The patients were followed up for use of healthcare services and new diagnoses through the use of national registers. RESULTS: Prevalence of suspicion was 5.7%. Suspicion was associated with an increase in referrals (prevalence ratio [PR] = 2.56, 95% confidence interval [CI] = 2.22 to 2.96), especially for diagnostic imaging (PR = 3.95, 95% CI = 2.80 to 5.57), increased risk of a new diagnosis of cancer or another serious disease within 2 months (hazard ratio [HR] = 2.98, 95% CI = 1.93 to 4.62)--especially for cancer (HR = 7.55, 95% CI = 2.66 to 21.39)--and increased use of general practice (relative risk [RR] = 1.14, 95% CI = 1.06 to 1.24) and hospital visits (RR = 1.90, 95% CI = 1.62 to 2.23). The positive predictive value of a GP suspicion was 9.8% (95% CI = 6.4 to 14.1) for cancer or another serious disease within 2 months. CONCLUSION: A GP suspicion of serious disease warrants further investigation, and the organisation of the healthcare system should ensure direct access from the primary sector to specialised tests.