, according to research published in the Journal of Investigative Medicine.
Tumor size remained the largest contributor to overall survival, but marital status was among several other significant factors, such as age, race, gender, treatment style, and pathologic stage, that can provide insight into a patient’s likelihood of overall survival, as it does with several other cancers.
“Married patients had the best prognosis, followed by single patients, and the prognosis of separated patients was the worst,” write Lixiang Zhang and colleagues at the First Affiliated Hospital of Anhui Medical University, Hefei, China. “We speculate that this might be due to the fact that married patients had better financial conditions and emotional encouragement, while separated patients might be more likely to experience financial difficulties [and] emotional loss.”
The results were not necessarily surprising to Richard M. Peek, Jr., MD, director of the division of gastroenterology and a professor of medicine at Vanderbilt University Medical Center, who was not involved in the research.
“Marital status is a reflection of support systems, and a strong support system is a prognosticator for increased compliance with medical appointments and medical therapies,” Dr. Peek told this news organization. “It is something to consider when somebody is being treated for gastric cancer, because if they don’t have a strong support system – and marital status can be a proxy for that – then they may need more intensive follow-up and surveillance, for example, than somebody who does not have that support system.”
Exploring the marital status–cancer survival connection
Gastric cancer is the third leading cause of cancer deaths across the world, causing 780,000 deaths in 2018, the authors note. Yet it’s difficult to accurately predict the prognosis in patients who undergo treatment for early stage gastric cancer. Previous research has found marital status to be associated with survival in prostate, cervical, and rectal cancers.
Mark A. Lewis, MD, director of gastrointestinal oncology at Intermountain Healthcare Cancer Center, Utah, told this news organization that the connection between marital status and cancer outcomes has been described previously, including in an even larger analysis using the U.S. Surveillance, Epidemiology, and End Results (SEER) database from 2013. That study found that “unmarried patients are at significantly higher risk of presentation with metastatic cancer, undertreatment, and death resulting from their cancer.”
In this study, the researchers compared marital status and survival rates among 3,647 patients with early-stage gastric cancer, using data from the SEER database. The study only included patients with tumors in the lamina propria, mucosa, and submucosa and excluded those with distant metastasis or distant lymph node metastases, a second cancer, no data on chemotherapy received, or unknown survival time.
Because they were using a nomogram and building a new predictive nomogram that would include marital status, the researchers divided the patient population into a training set of 2,719 patients and a testing set of 928 patients. Using overall survival as the primary endpoint, the analysis included the variables of “age at diagnosis, race, gender, tumor location, histology, grade, stage_T and stage_N, surgery in the primary site, lymph node dissection, chemotherapy, radiation, tumor size, insurance, and marital status,” the authors report.
Among the study population, 53.7% were married, 17.3% were widowed, 14% were single and never married, 7.5% were divorced, 1.1% were separated, and the status of 6.4% was unknown. Age at diagnosis, race, gender, histology, tumor grade, stage T, stage N, surgery type, tumor size, and insurance status were all significantly different between the marital status subgroups.
Married patients had the best prognosis, with an average overall survival of 72 months, compared with an average 60 months in widowed persons, the group with the poorest overall survival. Overall survival was higher in married women (76 months) than in married men (69 months). The same pattern held for women (62 months) and men (52 months) who had been widowed.
“It is worthy to note that survival was significantly better in divorced female patients than in divorced male patients,” the authors report. “Survival was better in female patients than in male patients” across all marital groups.