Epidemiology and Outcomes of Retroperitoneal Sarcoma: An Analysis of the Population-Based Cancer Registry in Japan 2016-2019.

Background: Retroperitoneal sarcoma (RPS) is a rare cancer, so few reports have previously characterized its national profiles. The capture rate of RPS in the Bone and Soft Tissue Tumor Registry was only 20%. The present study aimed to clarify the characteristics and clinical outcomes of RPS using the National Cancer Registry (NCR), which contains nationwide population-based data from Japan.

Real-World Comparison of Gene-Matched vs. Non-Gene-Matched Therapy Outcomes Using Integrated Genomic and Clinical Data.

Previous studies have demonstrated that 10%-25% of patients receive gene-matched therapy (GMT) after comprehensive genomic profiling (CGP). However, its real-world clinical effects remain unclear. This study assessed the feasibility of integrating the Center for Cancer Genomics and Advanced Therapeutics (C-CAT) repository that documented genomic and clinical data and the quality indicator (QI) dataset that included cancer-specific data and administered treatment as a model case of real-world data study of cancer genomic medicine in Japan.

Epidemiologic Features and Age-Related Differences in Management among Patients with Gastrointestinal Stromal Tumors in Japan: A National Cancer Registry Study.

Unlabelled: Data on the epidemiology of gastrointestinal stromal tumor (GIST) and differences in its management according to age group are limited in Japan. We aimed to conduct an epidemiologic evaluation and describe age-related differences in management using data from Japan's National Cancer Registry. We analyzed National Cancer Registry data of 21,426 patients with GIST between 2016 and 2019.

Incidence and age- and site-specific characteristics of osteosarcoma: a population-based study using National Cancer Registry 2016-2019.

Background: No previous reports have characterized national profiles of osteosarcoma. In this study, we examined nationwide statistics for osteosarcoma in Japan using data from the National Cancer Registry (NCR), a population-based cancer registry launched in 2016.

Methods: We identified 1187 patients with osteosarcomas entered in the NCR during 2016-2019 using the cancer topography and morphology codes from the International Classification of Diseases for Oncology, Third Edition.

Proposal for a New Classification of Rare Cancers Adopting Updated Histological Tumor Types.

Several classifications have been proposed to define rare cancers; however, the pathophysiological understanding of tumors evolves rapidly. We propose a New Classification of Rare Cancer (NCRC) using the updated International Classification of Diseases for Oncology 3.2 coding system and World Health Organization Classification of Tumors 5th edition.

Effect of different questionnaire formats on item nonresponse in older patients with cancer.

Background: Self-administered questionnaire surveys are instrumental in revealing patient experiences. However, concerns about the quality of data and validity of results arise from nonresponses, either to the entire survey or to specific items therein. The format of the survey can affect the ease of answering and subsequent responses.

Quality indicators for endometrial cancer care in Japan.

Objective: The incidence and mortality rates of endometrial cancer are increasing globally, including in Japan. Quality of cancer care is promoted through guideline adherence. This study aimed to establish quality indicators (QIs) for endometrial cancer and explore the factors contributing to treatment nonadherence.

Consultations of patients with cancer to enhance shared decision-making in Japan: A retrospective observational study.

Purpose: Treatment decisions are often highly complex when the outcomes are uncertain. In Japan, the consultation fees incurred can be reimbursed when physicians and nurses work together with patients to provide shared decision-making (SDM) on treatment plans. However, the extent to which reimbursed consultations are used by clinicians is unclear.

Incidence and site specific characteristics of angiosarcoma in Japan using a population-based national cancer registry from 2016 to 2019.

Angiosarcoma is so rare, no reports on its epidemiology and prognosis using nationwide population-based data exist. The present study aimed to clarify the characteristics and clinical outcomes of angiosarcoma using the National Cancer Registry (NCR) in Japan. We analyzed data from 23,522 patients with soft-tissue sarcomas (STS), entered in the NCR in 2016-2019 using the International Classification of Diseases-Oncology, Third Edition cancer topography and morphology codes.

Revision of quality indicators for cervical cancer and trend analysis of existing indicators in Japan.

Objective: Cervical cancer rates in Japan (16.0/100,000) exceed the global average rate (11.3/100,000, according to the High/Very-High Human Development Index in 2020).

Prognostic factors and management of elderly sarcoma in Japan: the population-based National Cancer Registry (NCR) in Japan.

Background: In aging societies like Japan, the number of elderly bone sarcoma (BS) and soft-tissue sarcoma (STS) patients is increasing. However, these malignancies' behavior is incompletely understood. We investigated clinical features, treatment modalities, survival, and prognostic factors for elderly BS and STS patients using Japan's National Cancer Registry (NCR).

Differences in experiences of patients with advanced cancer in Japan from 3 to 6 years after diagnosis.

Purpose: Coping with cancer presents significant challenges, especially for those with advanced-stage and long-term survival. However, research on advanced-stage cancer experiences in Japan remains limited. This study analyzed how patient experiences with advanced-stage cancer/long-term survival varied across different diagnosis periods.

Second Opinion Referrals of Cancer Patients in Japan-A Nationwide Study.

Seeking a second opinion (SO) is a patient's right that is essential to appropriate decision-making for their care and treatment. In Japan, however, no previous studies have provided objective data on the nationwide practice of SO among cancer patients. In this study, we investigated SO referrals, including delays in initiating care, using data from nationwide hospital-based cancer registries and 2018-2020 the Diagnosis Procedure Combination (DPC) survey.

Chondrosarcoma in Japan: an analytic study using population-based National Cancer Registry.

Background: Chondrosarcoma (CS) is a rare malignant bone tumor exhibiting diverse histological features and clinical behaviors. This study aimed to investigate the epidemiological characteristics, clinical features, prognostic factors, and subtype-specific differences of CS in Japan using National Cancer Registry data.

Methods: We analyzed data from CS cases diagnosed between 2016 and 2019, calculating age-adjusted incidence, estimating overall survival, and identifying prognostic factors through multivariate analysis.

Validity of patient-reported information: agreement rate between patient reports and registry data.

Background: The accuracy of patient-reported clinical information, including cancer stage, is not well understood. This study aims to evaluate the agreement between patient-reported survey data and clinical information recorded in hospital-based cancer registries (HBCR).

Methods: A total of 730 patients from 166 hospitals in Japan were randomly selected and informed that their survey responses would be validated against HBCR data.

Comprehensive epidemiology of melanoma at all sites: insights from Japan's National Cancer Registry, 2016-2017.

Background: Melanoma is a highly malignant cancer responsible for 55 000 deaths worldwide annually. Despite its severity, its epidemiology in Japan remains understudied owing to its rarity among Asians. This study aimed to determine the incidence of melanoma in Japan using data from the National Cancer Registry.

[Factors associated with cancer risk perception among high school sophomores: An analysis of national survey data based on a cancer education logic model to promote cancer control].

Objective　Using a nationwide survey of cancer education outcomes that contribute to cancer control, this study aimed to determine the short-term outcomes of cancer education associated with students' perceptions of cancer risk.Methods　An online survey was administered to second-year high school students between September and December 2022. The participants were asked about two basic attributes and 33 short-term outcome measures, as shown in the cancer education logic model.

Clinical Features and Prognosis of Malignant Cutaneous Adnexal Tumors: A Retrospective Study Using a Japanese Database.

Malignant cutaneous adnexal tumors (MCATs) are rare. Previous population-based studies to determine the clinical features and prognosis of MCATs mainly included Caucasian patients, and the characteristics of Asian patients with MCATs have not yet been investigated. We aimed to investigate the characteristics of Asian patients with MCAT using a Japanese database.

Incidence, mortality, survival, and treatment statistics of cancers in digestive organs-Japanese cancer statistics 2024.

Access to accurate statistical data is paramount in the pursuit of effective cancer control activities, including research, policy development, and clinical care. This paper presents a comprehensive statistical report on the incidence, mortality, survival, and treatment of major digestive organ cancers, including those of the esophagus, stomach, colon, rectum, liver, extrahepatic biliary tract, and pancreas, in Japan. We compiled data from the National Cancer Center's "Cancer Information Services" and government "e-Stat" websites and offered a succinct overview of basic statistics by using tables and graphical presentations.