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Clinical interval and diagnostic characteristics in a cohort of bladder cancer patients in Spain: a multicenter observational study

Abstract

Objective

We performed a cohort study in seven hospitals in Spain to determine the clinical characteristics of incident patients with bladder cancer, the diagnostic process, and the conditions that might affect health care interval times.

Results

314 patients with bladder cancer were included, 70.3 (Standard Deviation [SD] 11.2) years old and 85.0% male. Clinical stage was T1 in 45.9% of patients. The median interval time between first consultation and diagnosis was of 104.0 days (Inter quartile range [IQR]:112.0; range from 0 to 986), being shorter for those patients who attended a hospital for their first consultation. The median interval time between diagnosis and first treatment was of 0.0 days (IQR: 0.0; range from 0 to 366), being longer when the patient had a pathologic tumor stage ≥ T2a.

Introduction

Bladder cancer is the ninth most common diagnosed cancer worldwide, contributing with 429,793 new cases yearly [1]. In Spain it is the fifth most common diagnosed cancer with 13,789 new cases yearly [1, 2]. In 2012, the estimated number of deaths due to bladder cancer was of 165,068 worldwide and 5007 in Spain, making it the twelfth leading cause worldwide and the sixth in Spain [1].

Bladder cancer is one of the malignant tumors where a large proportion of health resources are being allocated due to its increasing survival rates and lifelong routine monitoring which involves associated treatment costs, and high recurrence rates [3,4,5,6].

Some international initiatives have been undertaken to obtain trustworthy information regarding the healthcare process for bladder cancer patients [7, 8]. In Spain, several studies reported information from hospital minimum data sets and hospital-based cancer registries [9, 10]. These sources of information, however, are quite limited in describing the diagnostic processes, therapeutic approaches, and prognostic factors in bladder cancer. One study conducted in Spain, estimated the annual incidence of bladder cancer and described the clinical profile of patients with bladder cancer, but did not assess the diagnostic and therapeutic processes and potential factors influencing time intervals [2]. For these reasons, the objective of the present study was to examine the clinical care process and health outcomes in incident cases of bladder cancer. In a future article, we will report the results related to the clinical follow-up.

Main text

Methods

We performed a multicenter, cohort study of bladder and prostate cancer, in Spain [11]. The research ethics committee from each of the seven tertiary participating hospitals (Additional file 1) approved the protocol. Patient recruitment was done from October 2010 to September 2011. Consecutive patients were selected from the urology and oncology departments and the inclusion criteria were: (1) being diagnosed of bladder cancer during the study period; (2) being diagnosed and treated at one of the participating hospitals; and (3) agree to participate and sign the informed consent form.

Clinical information was gathered by reviewing the medical records and structured interviews to patients (Additional file 2). The outcomes of interest were: socio-demographic data, body mass index (BMI), Charlson index, ECOG WHO score, setting of the first consultation, tests performed to diagnose bladder cancer, pathological results of bladder biopsy, patient tumor clinical stages, and time length of diagnostic and therapeutic intervals (Fig. 1). The time length from first symptoms to first consultation was defined as the period between the date of appearance of the first symptom related to bladder cancer and the date of attendance to the first medical visit (coded as less than 1 month, between 1 and 12 months, after 12 months), which then led to a bladder cancer diagnosis. For asymptomatic patients, the first consultation date was determined by the date when the bladder biopsy was performed. We took the positive biopsy report as the confirmatory diagnosis of the disease, whose date was used to calculate the diagnostic interval. The therapeutic interval was defined as the period between the dates of the pathological diagnosis and the initiation of the first treatment. For categorical variables we calculated relative frequencies; and for continuous variables, the mean and standard deviation (SD) or median and interquartile range (IQR) if skewed variables.

Fig. 1
figure1

Time intervals considered in our study

We assessed the association between time variables and potential predictors by using multilevel logistic regression models (patients at first level and hospitals at second level). As potential predictors we considered the following variables: age, BMI, gender, educational level, ECOG WHO score, setting of the first consultation, primary tumor clinical stage, and time since appearance of first symptoms. Continuous time variables were transformed into dichotomous variables. Based on previous studies we established an interval of 100 days as the optimal diagnostic interval, and 30 days for the optimal treatment interval [12,13,14]. Firstly, an empty model was adjusted considering only the random effect of hospital’s location based on the variability of the two outcomes investigated. Univariate models where then adjusted for each potential predictor. The final model was fitted through a backward selection procedure based on the Wald tests results. Both the empty model and the final multilevel models were estimated by maximum likelihood using the adaptive Gaussian quadrature approximation (with seven quadrature points) [15].

The effect measure was the odds ratio (OR) with 95% confidence interval, and was considered statistically significant if p < 0.05. We calculated the intra-cluster correlation coefficient (ICC) and the median odds ratio (MOR) to estimate the random inter-hospital variability. A lower ICC indicates a lower probability of patients sharing similar hospital experiences. The MOR is the increased risk of moving a patient to a hospital with longer diagnostic and therapeutic intervals [16]. The statistical software used was SPSS, v20.0 (SPSS INC., Chicago, IL, United States of America) and Stata, v12.1 (College Station, TX: StataCorp LP).

Results

Of the 347 patients recruited, 314 patients participated in the study and 33 were excluded for not meeting the inclusion criteria. Mean age was 70.3 years (SD: 11.2), 267 (85.0%) were male, 194 (61.9%) had at least completed primary studies, and 216 (68.8%) were retired (Table 1). The mean BMI was 27.2 (SD: 4.8) and 180 (57.3%) patients were full active according to the ECOG WHO performance status. The Charlson co-morbidity index was between one and three for 284 patients (90.5%). First consultation for bladder-related symptoms was performed in primary care settings for 151 participants (48.1%), and in hospital settings for the remaining 138 patients (43.9%). In 9.8% of the patients, the disease was diagnosed during a routine visit; in these cases, patients did not report symptoms, or only a certain degree of discomfort caused by the bladder cancer. From the total group, 85.0% were symptomatic; being hematuria the most frequent symptom (73.9%). The time from the first symptoms to first consultation was between 1 month and 1 year for 60.5% of the participants. The most common pathologic malignant diagnosis was urothelial cell carcinoma (90.1%). Other pathologic diagnoses were adenocarcinoma (8.6%), and squamous cell carcinoma (0.6%). The most frequent primary tumor clinical stage was T1 (45.9%).

Table 1 Characteristics of bladder cancer patients

A bladder ultrasound was reported in 79.0% of the patients and a cystoscopy in 52.2% (Additional file 3). The median diagnostic time interval was 104.0 days (IQR: 112.0) (Table 1). A statistically significant variability was found among hospitals for this interval (MOR: 1.47, 95% CI: 1.14–3.06) (Table 2). Patients who went to primary care setting presented an OR of 1.64 (95% CI 1.03–2.63, p = 0.038) of having a diagnostic interval longer than 100 days compared to patients who were first attended at the hospital. Furthermore, patients who experienced first symptoms longer than 1 month presented an OR of 2.38 (95% CI 1.25–4.51, p = 0.008) of having a diagnostic interval longer than 100 days compared to patients who experienced their symptoms in less than 1 month. There were no significant differences in terms of gender, age, BMI, educational level, ECOG WHO score, or primary tumor stages (Table 2; Additional file 4). The multivariate analysis did not show statistically significant variability among hospitals for this time interval.

Table 2 Time intervals and potential determinants

The median therapeutic interval was 0.0 days (IQR: 0.0) (Table 1). There was a statistically significant variability among hospitals for this interval (MOR: 2.81, 95% CI 1.56–11.06, p < 0.001). Patients with a BMI ≥ 25 showed a significant lower odd of having a therapeutic interval longer than 30 days (OR = 0.39; 95% CI 0.16–0.94, p = 0.037). Patients in a tumor stage from T2a–T4b presented an OR of 4.39 (95% CI 1.72–11.21, p = 0.002) of having a therapeutic interval longer than 30 days compared to patients with inferior clinical stages. No significant differences were found within the other outcomes. The multivariate analysis showed statistically significant variability among hospitals in the therapeutic interval and the only factor that significantly influenced this interval was the tumor stage (Table 2).

Discussion

Our multicenter study in Spain included 314 patients mostly diagnosed with bladder urothelial cell carcinoma. The population characteristics were similar to those described in previously published studies [2, 17,18,19,20,21]. The majority of bladder cancers started with symptoms, being hematuria the most frequent. The percentage (42.3%) of localized tumors was similar to another study conducted in Spain [2], but considerably higher than other previous studies [17, 21].

Most patients in our study population had an early stage of bladder cancer and the diagnosis interval was relatively long, with a median of 104.0 days. Patients who experienced first symptoms for no longer than 1 month before the first consultation and those who went to a hospital for their first consultation had a significantly narrower diagnostic interval; this was expected as the hospital has the possibility of performing TUR (TransUrethral Resection) and biopsy (diagnosis of certainty and treatment), and in primary care only basic imaging tests. There was not significant variability among hospitals in relation to this time interval. The delay in diagnostic interval is concordant with other studies [22, 23], and consequently some European initiatives have emerged to narrow this interval [24,25,26]. These initiatives suggest that expediting the initial ultrasonography/cystoscopy in all patients could improve the time of diagnosis and treatment for bladder cancer. The European Association of Urology guideline recommends ultrasound as one of the initial staging techniques for patients with hematuria, and cystoscopy only for patients experiencing symptoms suggestive of bladder cancer [27].

Previous Spanish studies assessed the diagnostic and therapeutic time intervals in cancer patients, however they were mainly performed in a single hospital and they all included other types of cancer [28, 30], except for one conducted more than 20 years ago [29]. One Spanish multicenter study reported a mean treatment interval longer than ours (73.2 days) due to a different definition of this variable [13]. They measured the time from the first performed diagnostic tests and not from the date of histological confirmation of bladder cancer until treatment.

In addition, our results reveal that among centers there is a significant variability in terms of treatment intervals. Diverse population characteristics, health care organizations (e.g. health care pathways connecting primary and specialized care) and clinical policies across the different Spanish regions may explain, at least in part, this observed heterogeneity.

Some patients’ and tumor features were also associated with the length of time between diagnosis and treatment; e.g. among patients with a higher primary tumor clinical stage. This finding may be explained because this group of patients is generally treated with cystectomy and chemotherapy and require a more complex process than a TUR approach.

Limitations

This study may be prone to some limitations. Information bias is a potential issue as the study is based exclusively on information obtained from hospital clinical records. As a result, some outpatient factors, such as those related to consultations in primary care settings, may not have been properly forethought.

Abbreviations

BMI:

body mass index

ECOG:

Eastern Cooperative Oncology Group

ICC:

intra-cluster correlation coefficient

IQR:

interquartile range

MOR:

median odds ratio

OR:

odds ratio

SD:

standard deviation

USA:

United States of America

USD:

United States dollar

WHO:

World Health Organization

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Authors’ contributions

Study concepts: XB. Study design: XB, MJM. Data acquisition: XB, MJM, RV, MJS, MMS, JDC, JIE, MF, JIP, JP, SS, EM, VA, JZ. Quality control of data and algorithms: MJM, RV. Data analysis and interpretation: XB, MJM, RV, JZ. Statistical analysis: RV, VA, JZ. Manuscript preparation: XB, MJM, RV, EM. Manuscript editing: XB, MJM, RV, MJS, MMS, JDC, JIE, MF, JIP, JP, SS, EM, VA, JZ. Manuscript review: XB, MJM, RV, MJS, MMS, JDC, JIE, MF, JIP, JP, SS, EM, VA, JZ. All authors read and approved the final manuscript.

Acknowledgements

We would like to thank Andrea Cervera Alepuz and Montserrat León for the English review and editing of the manuscript. Dr. Mª José Martinez Zapata is funded by a Miguel Servet research contract from the Instituto de Salud Carlos III (CP15/00116). The researchers listed are considered as authors of the EMPARO study group.

EMPARO study Group:

Coordinating investigator: Xavier Bonfill Cosp (Iberoamerican Cochrane Centre. Public Health and Clinical Epidemiology Service. Hospital de la Santa Creu i Sant Pau, IIB Sant Pau, Barcelona, Spain).

Project manager: Mª José Martínez Zapata (Iberoamerican Cochrane Centre. IIBSant Pau, Barcelona, Spain).

Clinical research assistants: Alborada Martínez (Universidad de Valencia); Enrique Morales Olivera (Escuela Andaluza de Salud Pública, Granada, Spain); Esther Canovas, Laura Muñoz, Gemma Mas, René Acosta, Ekaterina Popova (Iberoamerican Cochrane Centre. IIBSant Pau, Barcelona, Spain); Irma Ospina (Hospital 12 de Octubre, Madrid, Spain); Mª José Velázquez (Hospital Donostia, Donostia, Spain); Tamara Ruiz Merlo (Hospital Ramón y Cajal, Madrid, Spain); Gael Combarros Herman, Judit Tirado Muñoz (IMIM, Barcelona, Spain).

Statistical analysis: Robin W.M. Vernooij (Iberoamerican Cochrane Centre. IIBSant Pau, Barcelona, Spain); Victor Abraira and Javier Zamora (Unidad de Bioestadística Clínica. Hospital Universitario Ramón y Cajal. IRYCIS, Madrid, Spain).

Co-investigators:

Barcelona, Spain

Albert Frances (Hospital del Mar); Carola Orrego Villagran, Rosa Suñol (Instituto Universitario Avedis Donabedian); Dimelza Osorio, Gemma Sancho Pardo, Ignasi Bolívar, José Pablo Maroto, Mª Jesús Quintana, Martin Lorente Cristina (Hospital de la Santa Creu i Sant Pau); Ferran Algaba, Palou Redorta, Salvador Esquena (Fundació Puigvert); Jordi Bachs (Fundació Privada Hospital de la Santa Creu i Sant Pau); Mª José Martínez Zapata (Iberoamerican Cochrane Centre. IIBSant Pau); Montserrat Ferrer Fores, Stefanie Schmidt, Olatz Garin, Virginia Becerra Bachito, Yolanda Pardo (IMIM - Hospital del Mar Medical Research Institute).

Bilbao, Spain

Amaia Martínez Galarza, José Ignacio Pijoán Zubizarreta, (Hospital Universitario Cruces/BioCruces Health Research Institute).

Tenerife, Spain

David Manuel Castro Diaz, Juan Manuel Ramos Goñi, Julio Lopez Bastida (HTA Unit of the Canary Islands Health Service).

Granada, Spain

Armando Suárez Pacheco, Cesar García López, José Manuel Cozar Olmo (Hospital Universitario Virgen de las Nieves); Carmen Martínez, Daysy Chang Chan, Mª José Sánchez Pérez (Escuela Andaluza de Salud Pública).

Madrid, Spain

Ana Isabel Díaz Moratinos, Angel Montero Luis, Asunción Hervás, Carmen Vallejo Ocaña, Costantino Varona, Javier Burgos, Javier Zamora, Jose Alfredo Polo Rubio, Luis López-Fando Lavalle, Miguel Angel Jimenez Cidre, Muriel García Alfonso, Nieves Plana Farras, Rosa Morera Lopez, Sonsoles Sancho Garcia, Victor Abraira, Victoria Gomez Dos Santos (Hospital Ramón y Cajal); Agustín Gómez de la Cámara, Javier de la Cruz, Juan Passas Martínez, Humberto García Muñoz, Mª Ángeles Cabeza Rodríguez (Hospital 12 de Octubre).

San Sebastián, Spain

Irune Ruiz Díaz, José Ignacio Emparanza, Juan Pablo Sanz Jaka (Hospital Universitario Donostia).

Valencia, Spain

Agustín LLopis González, María Morales (Universidad de Valencia); Carlos Camps, Cristina Caballero Díaz, Emilio Marqués Vidal, Francisco Sánchez Ballester, Joaquín Ulises Juan Escudero, Jorge Pastor Peidro, José López Torrecilla, Mª Macarena Ramos Campos, Miguel Martorell Cebollada (Consorcio Hospital General Universitario de Valencia).

Competing interests

The authors declare that they have no competing interests.

Availability of data and materials

The datasets during and/or analyzed during the current study are available from the corresponding author on reasonable request.

Consent to publish

Not applicable.

Ethics approval and consent to participate

This study was approved by the Ethics Committees of Hospital de la Santa Creu i Sant Pau (Barcelona), Fundación Puigvert (Barcelona), Hospital 12 de Octubre (Madrid), Hospital Ramón y Cajal (Madrid), Hospital Universitario Donostia (San Sebastián), Hospital Nuestra Señora del Mar (Barcelona), Hospital Virgen de las Nieves (Granada), Consorcio Hospital General Universitario de Valencia and Basque Country Ethics Committee.

Previous inclusion in this study, all patients were informed about the study, they accepted to participate and signed the consent form.

Funding

Instituto Carlos III: Grants PS09/01204 and PS09/01619 (Fondo de Investigación Sanitaria. Spain).

Publisher’s Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Author information

Correspondence to María José Martinez-Zapata.

Additional files

13104_2017_3024_MOESM1_ESM.docx

Additional file 1. List of Ethic Committees that approved the study.

13104_2017_3024_MOESM2_ESM.docx

Additional file 2. Patients’ structured interview.

13104_2017_3024_MOESM3_ESM.docx

Additional file 3. Diagnostic tests for bladder cancer patients.

13104_2017_3024_MOESM4_ESM.docx

Additional file 4. Characteristics of bladder cancer patients by hospitals.

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Keywords

  • Urinary bladder neoplasm
  • Neoplasm staging
  • Time factors
  • Diagnostic techniques and procedures
  • Observational study