BOSTON – Expanding access to health insurance for low- and moderate-income families has apparently improved colorectal cancer care in Massachusetts, and may do the same for other states that participate in Medicaid expansion under the Affordable Care Act.
That assertion comes from investigators at Massachusetts General Hospital in Boston. They found that following the introduction in 2006 of a universal health insurance law in the Bay State – the law that would serve as a model for the Affordable Care Act – the rate of elective colorectal resections increased while the rate of emergent resections decreased.
In contrast, in three states used as controls, the opposite occurred.
“This could be due to a variety of different factors, including earlier diagnosis, presenting with disease more amenable to surgical resection. It could also be due to increased referrals from primary care providers or GI doctors,” said Dr. Andrew P. Loehrer from the Massachusetts General Hospital Department of Surgery, at the annual Society of Surgical Oncology Cancer Symposium.
He acknowledged, however, that the administrative dataset he and his colleagues used in the study lacks information about clinical staging or use of neoadjuvant therapy, making it difficult to determine whether insured patients actually present at an earlier, more readily treatable disease stage.
Nonetheless, “from a cancer standpoint, my study provides early, hopeful evidence. In order to definitively say that this improves care, we need to have some more of the cancer-specific variables, but with this study, combined with some other work that we and other groups have done, we see that patients in Massachusetts are presenting with earlier stage disease, whether it’s acute disease or cancer, and they’re getting more appropriate care in a more timely fashion,” he said in an interview.
Dr. Loehrer noted that disparities in access to health care have been shown in previous studies to be associated with the likelihood of unfavorable outcomes for patients with colorectal cancer. For example, a 2008 study (Lancet Oncol. 2008 Mar;9:222-31) showed that uninsured patients with colorectal cancer had a twofold greater risk for presenting with advanced disease than privately insured patients. Additionally, a 2004 study (Br J Surg. 91:605-9) showed that patients who presented with colorectal cancer requiring emergent resection had significantly lower 5-year overall survival than patients who underwent elective resection.
Massachusetts implemented its pioneering health insurance reform law in 2006. The law increased eligibility for persons with incomes up to 150% of the Federal Poverty Level, created government-subsidized insurance for those with incomes from 150% to 300% of the poverty line, mandated that all Bay State residents have some form of health insurance, and allowed young adults up to the age of 26 to remain on their parents’ plans.
To see whether insurance reform could have a salutary effect on cancer care, the investigators drew on Agency for Health Research and Quality (AHRQ) State Inpatient Databases for Massachusetts and for Florida, New Jersey, and New York as control states. They used ICD-9 diagnosis codes to identify patients with colorectal cancer, including those who underwent resection.
To establish procedure rates, they used U.S. Census Bureau data to establish the population of denominators, which included all adults 18-54 years of age who were insured either through Medicaid, Commonwealth Care (in Massachusetts), or were listed as uninsured or self-pay. Medicare-insured patients were not included, as they were not directly affected by the reform law.
They identified 18,598 patients admitted to Massachusetts hospitals for colorectal cancer from 2001 through 2011, and 147,482 admitted during the same period to hospitals in the control states.
The authors created Poisson difference-in-differences models which compare changes in the selected outcomes in Massachusetts with changes in the control states. The models were adjusted for age, sex, race, hospital type, and secular trends.
They found that admission rates for colorectal cancer increased over time in Massachusetts by 13.3 per 100,000 residents per quarter, compared with 8.3/100,000 in the control states, translating into an adjusted rate ratio (ARR) of 1.13. Resection rates for cancer, the primary study outcome, also grew by a significantly larger margin in Massachusetts, by 5.5/100,000, compared with 0.5/100,000 in control states, with an ARR of 1.37 (P less than .001 for both comparisons).
For the secondary outcome of changes in emergent and elective resections after admission, they found that emergent surgeries in Massachusetts declined by 2.7/100,000, but increased by 4.4/100,000 in the states without insurance reform. Similarly, elective resections after admission increased in the Bay State by 7.4/100,000, but decreased by 1.8/100,000 in control states.