Purpose This study aimed to investigate whether MOS methylation can be useful for the prediction of metachronous recurrence after endoscopic resection of gastric neoplasms.
Materials and Methods From 2012 to 2017, 294 patients were prospectively enrolled after endoscopic resection of gastric dysplasia (n=171) or early gastric cancer (n=123). When Helicobacter pylori was positive, eradication therapy was performed. Among them, 124 patients completed the study protocol (follow-up duration > 3 years or development of metachronous recurrence during the follow-up). Methylation levels of MOS were measured at baseline using quantitative MethyLight assay from the antrum.
Results Median follow-up duration was 49.9 months. MOS methylation levels at baseline were not different by age, sex, and current H. pylorii infection, but they showed a weak correlation with operative link on gastritis assessment (OLGA) or operative link on gastric intestinal metaplasia assessment (OLGIM) stages (Spearman’s ρ=0.240 and 0.174, respectively; p < 0.05). During the follow-up, a total of 20 metachronous gastric neoplasms (13 adenomas and 7 adenocarcinomas) were developed. Either OLGA or OLGIM stage was not useful in predicting the risk for metachronous recurrence. In contrast, MOS methylation high group (≥ 34.82%) had a significantly increased risk for metachronous recurrence compared to MOS methylation low group (adjusted hazard ratio, 4.76; 95% confidence interval, 1.54 to 14.79; p=0.007).
Conclusion MOS methylation can be a promising marker for predicting metachronous recurrence after endoscopic resection of gastric neoplasms. To confirm the usefulness of MOS methylation, validation studies are warranted in the future (ClinicalTrials No. NCT04830618).
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Purpose A prior history of breast cancer is a risk factor for the subsequent development of primary peritoneal, epithelial ovarian, and fallopian tubal (POFT) cancers. This study aimed to estimate the incidence of secondary POFT malignancy in breast cancer patients and the clinical outcomes of primary and secondary POFT cancer.
Materials and Methods We searched the Korea Central Cancer Registry to find patients with primary and secondary POFT cancer who had breast cancer in 1999-2017. The incidence rate and standardized incidence ratio were calculated. Additionally, we compared the overall survival of patients with primary and secondary POFT cancer.
Results Based on the age-standardized rate, the incidence of second primary POFT cancer after breast cancer was 0.0763 per 100,000 women, which increased in Korea between 1999 and 2017. Among the 30,366 POFT cancer patients, 25,721 were primary POFT cancer only, and 493 had secondary POFT cancer after a breast cancer diagnosis. Second primary POFT cancer patients were older at the time of diagnosis (55 vs. 53, p < 0.001) and had a larger proportion of serous histology (68.4% vs. 51.2%, p < 0.001) than patients with primary POFT. There were no differences between the two groups in tumor stage at diagnosis. The 5-year overall survival rates were 60.2% and 56.3% for primary and secondary POFT cancer, respectively (p=0.216).
Conclusion The incidence of second primary POFT cancer after breast cancer increased in Korea between 1999 and 2017. Besides, second primary POFT cancer patients were diagnosed at older ages and had more serous histology.
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Purpose
The epidemiology of B-cell non-Hodgkin lymphoma (BNHL) in Asia is not well described, and rates of second primary malignancies (SPM) in these patients are not known. We aimed to describe temporal changes in BNHL epidemiology and SPM incidence in Korea.
Materials and Methods
A retrospective cohort study used claims data from the National Health Insurance Service that provides universal healthcare coverage in Korea. Newly diagnosed patients aged at least 19 years with a confirmed diagnosis of one of six BNHL subtypes (diffuse large cell B-cell lymphoma [DLBCL], small lymphocytic and chronic lymphocytic [CLL/SLL], follicular lymphoma [FL], mantle cell lymphoma [MCL], marginal zone lymphoma [MZL], and lymphoplasmacytic lymphoma/Waldenström’s macroglobulinemia [WM]) during the period 2006-2015 were enrolled and followed up until death, dis-enrolment, or study end, whichever occurred first. Patients with pre-existing primary cancers prior to the diagnosis of BNHL were excluded.
Results
A total of 19,500 patients with newly diagnosed BNHL were identified out of 27,866 with non-Hodgkin lymphoma (NHL). DLBCL was the most frequently diagnosed subtype (41.9%-48.4% of NHL patients annually, 2011-2015). Standardized incidence of the six subtypes studied per 100,000 population increased from 5.74 in 2011 to 6.96 in 2015, with most increases in DLBCL, FL, and MZL. The incidence (95% confidence interval) of SPM per 100 person-years was 2.74 (2.26-3.29) for CLL/SLL, 2.43 (1.57-3.58) for MCL, 2.41 (2.10-2.76) for MZL, 2.23 (2.07-2.40) for DLBCL, 1.97 (1.61-2.38) for FL, and 1.41 (0.69-2.59) for WM.
Conclusion
BNHL has been increasingly diagnosed in Korea. High rates of SPM highlight the need for continued close monitoring to ensure early diagnosis and treatment.
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Cancer Res Treat. 2018;50(4):1175-1185. Published online December 20, 2017
Purpose
Pancreatic cancer associated double primary tumors are rare and their clinicopathologic characteristics are not well elucidated.
Materials and Methods
Clinicopathologic factors of 1,352 primary pancreatic cancers with or without associated double primary tumors were evaluated.
Results
Of resected primary pancreatic cancers, 113 (8.4%) had associated double primary tumors, including 26 stomach, 25 colorectal, 18 lung, and 13 thyroid cancers. The median interval between the diagnoses of pancreatic cancer and associated double primary tumors was 0.5 months. Overall survival (OS) of pancreatic cancer patients with associated double primary tumors was longer than those with pancreatic cancer only (median, 23.1 months vs. 17.0 months, p=0.002). Patients whose pancreatic cancers were resected before the diagnosis of metachronous tumors had a better OS than patients whose pancreatic cancer resected after the diagnosis of metachronous tumors (48.9 months and 13.5 months, p=0.001) or those whose pancreatic cancers were resected synchronously with non-pancreas tumors (19.1 months, p=0.043). The OS of pancreatic cancer patients with stomach (33.9 months, p=0.032) and thyroid (117.8 months, p=0.049) cancers was significantly better than those with pancreas cancer only (17.0 months).
Conclusion
About 8% of resected pancreatic cancers had associated double primary tumors, and those from the colorectum, stomach, lung, and thyroid were common. Patients whose pancreatic cancer was resected before the diagnosis of metachronous tumors had better OS than those resected after the diagnosis of metachronous tumors or those resected synchronously.
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Purpose
Previous western studies have found Caucasians with skin cancer, either melanoma or nonmelanoma skin cancer (NMSC), have an elevated risk of second primary cancer. Our objective was to assess the risk of second primary cancer in Taiwanese with NMSC.
Materials and Methods
By using data from Taiwan’s National Health Insurance Research Database, we conducted a population-based cohort study to assess the risk of incident second primary cancer in Taiwanese affected by NMSC.
Results
We identified 505 subjects with NMSC and 2,020 matched controls. After adjustment for potential confounders including age, sex, urbanization, and Charlson Comorbidity Index, people who had NMSC had a 1.43-fold (95% confidence interval [CI], 1.05 to 1.96) risk for the development of second primary cancer as comparedwith control group. Menwith NMSC had a 2.99-fold (95% CI, 1.00 to 9.10) risk for second primary cancer involving the lip, oral cavity, and pharynx and a 3.51-fold (95% CI, 1.21 to 10.17) risk for second primary cancer involving the genitourinary organs when compared to the control group. By contrast, women with NMSC did not have an increased risk of second primary cancer.
Conclusion
This study revealed Asians with NMSC have an increased risk of second primary cancer. Our findings can be a useful reference for health care for people diagnosed with NMSC.
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Cancer Res Treat. 2018;50(1):293-301. Published online April 19, 2017
Purpose
Secondary primary cancers (SPCs) commonly arise in patients with renal cell carcinoma (RCC). We designed the present study to estimate the SPC incidence in Korean patients with RCC.
Materials and Methods
The study cohort was population-based and consisted of 40,347 individuals from the Korean Central Cancer Registry who were diagnosed with primary renal cancer between 1993 and 2013. Standardized incidence ratios (SIRs) for SPCs were estimated for different ages at diagnosis, latencies, diagnostic periods, and treatments.
Results
For patients with primary RCC, the risk of developing a SPC was higher than the risk of developing cancer in the general population (SIR, 1.13; 95% confidence interval, 1.08 to 1.18). Most cancer types showed higher incidences in patients with RCC than in the general population. However, the relative incidence of gastric cancer as an SPC varied by age. Gastric cancer incidence was elevated in young patients (< 30 years) with RCC, but reduced in older (≥ 30) patients with RCC. Patients with advanced RCC died prematurely, regardless of SPC development. In contrast, those with early-stage RCC survived for longer periods, although SPC development affected their post-RCC survival. After SPC development, women had better survival than men.
Conclusion
In Korean patients with primary RCC, the incidence of SPC was 13% higher than the incidence of cancer in the general population. These findings may play important roles in the conduct of follow-up evaluations and education for patients with RCC.
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Purpose Screening for second primary cancer (SPC) is one of the key components to survivorship care. We aim to evaluate the oncologists’ experience with SPCs and assess the current practice, perceived barriers, and recommendations related to SPC screening. Materials and Methods A nationwide survey was conducted with a representative sample of 496 Korean oncologists. A questionnaire based on the findings from our previous qualitative study was administered. Results More than three-fourths of oncologists (76.3%), who participated in the study, had experience with SPC patients. Over half of them (51.9%) stated that it was an embarrassing experience. While the current management practice for SPC varies, most oncologists (80.2%) agreed on the necessity in proactively providing information on SPC screening. A short consultation time (52.3%), lack of guidelines and evidence on SPC screening (47.7%), and patients’ lack of knowledge about SPCs (45.1%) or SPC screening (41.4%) were most frequently reported as barriers to providing appropriate care for managing SPC. Oncologists recommended the development of specific screening programs or guidelines in accordance to the type of primary cancer (65.9%), the development of an internal system for SPC screening within the hospital (59.7%) or systematic connection with the national cancer screening program (44.3%), and education of oncologists (41.4%) as well as patients (48.9%) regarding SPC screening. Conclusion Many oncologists reported the occurrence of SPC as an embarrassing experience. Given the variations in current practice and the lack of consensus, further studies are warranted to develop the optimal clinical strategy to provide SPC screening for cancer survivors.
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Purpose
The pattern of double primary cancer after treatment for breast cancer is important for patient survival.
Materials and Methods
We analyzed 108 cases of metachronous double primary cancer in breast cancer patients treated from 1999 to 2012.
Results
Metachronous double primary cancers occurred in 108 of 2,657 patients (4.1%) with breast cancer. The median time to the occurrence of second cancer after diagnosis of the first was 58.4±41.2 months (range, 6.9 to 180.2 months). The most common cancer was thyroid cancer, which occurred in 45 patients (41.7%). This was followed by gastric cancer in 16 patients (14.8%), endometrial cancer in 10 patients (9.3%), and cervical cancer in seven patients (6.5%). The relative risk showed a significant increase in endometrial (4.78; 95% confidence interval [CI], 1.66 to 13.79), gastric (2.61; 95% CI, 1.68 to 4.06), and thyroid cancer (1.95; 95% CI, 1.37 to 2.79). At 5 years after diagnosis of breast cancer, secondary cancer occurred in 48 patients (44.4%), with 50.0% of the endometrial, 56.3% of the stomach, and 37.8% of the thyroid cancer cases being diagnosed after 5 years. Median survival after diagnosis of the second cancer was 123.9±11.2 months. The prognosis was mainly influenced by the anatomic site.
Conclusion
The incidence of endometrial, stomach, and thyroid cancer increased significantly after treatment with primary breast cancer, and survival was dependent on early detection and the type of second primary cancer. A prolonged follow-up examination for metachronous double primary cancer is needed to provide early detection and improve survival time in patients with breast cancer.
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PURPOSE The pattern of double primary cancers after treatment for gastric cancer is important for a patient's survival.
MATERIALS AND METHODS We analyzed the clinicopathologic data of 214 gastric cancer patients from October 1996 to November 2007 with regard to metachronous second primary cancers.
RESULTS Out of 5,778 patients with gastric cancer, metachronous second primary cancers occurred in 214 patients. The median age was 61.8 years, the number of male and female patients was 140 (65.4%), 74 (34.6%), respectively. The median time to the occurrence of second cancers after diagnosis of the first was 39.2 months (standard deviation, 31.2 months). The most common cancer was colorectal cancer, which occurred in 44 patients (20.6%), and lung cancer in 33 patients (15.4%), hepatocellular carcinoma in 26 patients (12.1%), ovarian cancer in 15 patients (7.0%), cervical cancer in 12 patients (7.0%), breast cancer in 11 patients (5.1%), and esophageal cancer in 11 patients (5.1%). The observed/expected (O/E) ratio showed a significant increase in colorectal (1.25), male biliary (1.60), ovarian (8.72), and cervical cancer (3.33) with primary gastric cancer. After five years from diagnosis of gastric cancer, secondary cancer occurred in 50 patients (23.4%), and breast cancer, prostate cancer, laryngeal cancer, lung cancer, and hepatocellular carcinoma were the most frequent.
CONCLUSION The O/E ratio showed a significant increase in colorectal, male biliary, ovarian, and cervical cancer with primary gastric cancer, and second primary cancer as the main cause of death for these patients. A follow-up examination for metachronous double primary cancer is needed in order to improve the survival time in patients with gastric cancer.
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