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J Cancer Metastasis Treat 2017;3:100-4.10.20517/2394-4722.2017.19© 2017 OAE Publishing Inc.
Open AccessOriginal Article

Impact of health care insurance on overall survival of patients with multiple myeloma and monoclonal gammopathy of undetermined significance

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1Department of Medicine, Feist-Weiller Cancer Center, Louisiana State University Health Sciences Center, Shreveport, LA 71103, USA.

2Department of Medicine, Louisiana State University, New Orleans, LA 71103, USA.

3Department of Lymphoma/Myeloma, MD Anderson Cancer Center, Houston, TX 77030, USA.

Correspondence Address: Dr. Srinivas S. Devarakonda, Department of Medicine, Feist-Weiller Cancer Center, Louisiana State University Health Sciences Center, 1501 Kings Highway, Shreveport, LA 71103, USA. E-mail: sdeva1@lsuhsc.edu

    ...

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    Abstract

    Aim: Health care insurance improves access to care and thus outcome in patients with solid tumors. Little information on the impact of health care insurance on hematological malignancies including multiple myeloma exists. The authors aimed to analyze the effect of health care insurance on the survival of patients with multiple myeloma (MM) and monoclonal gammopathy of undetermined significance (MGUS) at Louisiana State University Health Sciences Center in Shreveport, LA.

    Methods: Two hundred fifty seven patients were reviewed, of which 208 had MM and 49 had MGUS.

    Results: One hundred and seventy seven patients (69%) were funded and 80 (31%) were non-funded. Funded patients with MM had an overall survival (OS) of 6.2 years compared to 3.8 years for non-funded patients (P < 0.001). Survivals were not significantly affected by race or gender. The analysis demonstrates that funded patients with MM and MGUS patients have statistically significant increased OS compared to patients with no insurance.

    Conclusion: This study showed that patients with multiple myeloma and MGUS with health care insurance have longer overall survival when compared to non-funded patients.

    Introduction

    Multiple myeloma (MM) is the second most common hematological malignancy in the United States and the most common hematological malignancy in African-Americans.[1,2] MM is preceded by an asymptomatic premalignant proliferation of plasma cells termed “monoclonal gammopathy of uncertain significance (MGUS)”.[3-6] MM and MGUS are twice as common in African-Americans as in Caucasians and more common in males than females.[7-10] The prevalence of MGUS is 3% in people older than 50 years and patients with MGUS have an annual 1% risk of progression to MM or related malignant disorder.[11-14] Advances in therapeutic options such as proteasome inhibitors, immune modulatory drugs (IMDs) and stem cell transplantation (SCT) have improved the prognosis and survival of patients with MM.[15,16] Several drugs belonging to the class of proteasome inhibitors such as Bortezomib, Carfilzomib, Ixazomib, immunomodulators such as Lenalidomide, Pomalidomide and monoclonal antibodies such as Daratumumab and Elotuzumab have changed the landscape of treatment of multiple myeloma in the last decade. Patients with MGUS undergo active surveillance for progression to MM and do not receive active treatment.

    The impact of socioeconomic status has been studied in several solid organ malignancies including breast, colorectal, prostate and pancreatic cancer. Health care insurance has been shown to result in positive outcomes in patients diagnosed with these malignancies.[17,18] Health insurance improves access to health care, early diagnosis and access to several advanced therapeutic options. Several studies have explored the influence of socioeconomic status on the survival of patients with leukemia and MM.[19,20] However, these studies have not examined the effect of insurance on the outcome of these hematologic malignancies. We attempted to study the effect of health care insurance; in particular, on the outcomes of patients diagnosed with MM and MGUS at Louisiana State University Health Sciences Center (LSUHSC), Shreveport, LA, where approximately half the patient population is uninsured.

    Methods

    We conducted a retrospective study of all the patients at our institution diagnosed with and treated for MM and MGUS between the years 1997 and 2012. MM and MGUS were defined using the International Classification of Disease for Oncology, 3rd edition (ICD-O-3) codes. All the data were obtained from the electronic medical records of the cancer center at our institution and Social Security death index. Approval for accessing the patient information was obtained from the Institutional Review Board (IRB) at our institution. Date of diagnosis, demographic factors such as age, gender, race, health care insurance status and staging at the time of diagnosis were available for each case. Durie-Salmon staging was used for staging the patients with MM. Patients with MM were classified as having high risk and standard risk disease according to the Mayo clinic risk stratification for myeloma.[21] Medical insurance status at the time of diagnosis was defined as funded if a patient had Medicaid, Medicare or commercial insurance and non-funded if the patient was coded as free-care or self-pay.

    Descriptive statistics were used to describe the data. Product limit methods were used to estimate survival and Log rank test was used to compare survival difference for each factor. Statistical software SAS® 9.3 (SAS institute, Gary, NC) were used in the statistical data analysis. A P-value of < 0.05 was considered the threshold for statistical significance.

    Results

    The medical records were reviewed of 257 patients with MM or MGUS diagnosed and treated at LSUHSC from 1997-2012. Of these patients 208 (80.9%) had MM and 49 (19.1%) had MGUS. The median age at diagnosis was 60 years for MM and 59 years for MGUS patients. Of all the patients diagnosed with MM and MGUS, 92 (37%) were Caucasians and 165 (63%) were African-Americans. There was a slight female predominance with 114 male (44%) and 143 female (56%) patients [Table 1]. Stratification of the patients according to the stage of MM revealed 49 (23.5%) to be stage 1, 23 (11%) to be stage 2, 95 (45.6%) to be stage 3A and 41 (19.7%) to be stage 3B disease. When patients were classified according to their health care insurance status, 177 (69%) were funded and 80 (31%) were non-funded. At presentation, 23.6% of non-funded patients had stage 3B disease compared to 18.5% in the funded group (P = 0.06). High-risk features were seen in 16.7% of the MM patients with insurance as compared to 27.2% of the non-funded patients (P = 0.29). However, the median survival was 6.2 years in the funded group compared to 3.8 years in the non-funded group (P < 0.001) [Figure 1] with a 5-year survival for MM patients of 60% in the funded group compared to 42% in the non-funded group. The 5-year survival for MGUS was 95% for patients with insurance and 62% for patients without insurance (P = 0.03).When the effect of race was examined the overall survival in the Caucasian group with MM was noted to be 6.2 years compared to 5.1 years in the African American group (P = 0.517). Likewise, gender had little impact on survival as there was only a slight but not statistically significant increase in survival in female patients with MM with a mean survival of 5.4 years for females vs. 5.1 years for males (P = 0.748). Follow up of patients with MGUS at 8.3 years revealed that 73% of funded patients were alive as compared to 50% in the non-funded group (P = 0.03).The overall survival of patients when classified according to stage was 12.8 years for stage 1, 4.3 years for stage 2, 5.1 years for stage 3A and 3.3 years for stage 3B (P < 0.0001). Although the stage distribution was similar in the funded and non-funded groups at the time of diagnosis, within each stage the funded patients had improved survival. P-values to compare the survival difference between funded and non-funded groups for stage 1, 2, 3a, and 3b were 0.098, 0.267, 0.039, and 0.123, respectively.

    Table 1

    Patient demographics

    MM MGUS
    Age, years 59.7 (21.2-93.3) 61.0 (41.6-83.3)
    Race
     AA 143 (66.5%) 20 (50%)
     Cauc 72 (33.5%) 20 (50%)
    Gender
     Male 95 (44.2%) 19 (47.5%)
     Female 120 (55.8%) 21 (52.5%)
    Insurance
     Funded 121 (56.28%) 25 (62.5%)
     Non-funded 94 (43.72%) 15 (37.5%)

    Figure 1. Two hundred and fifty-seven patients with multiple myeloma or MGUS diagnosed and treated. (A) Overall survival of patients with multiple myeloma; (B) comparison of overall survival of multiple myeloma based on race; (C) comparison of overall survival of multiple myeloma based on funding; (D) comparison of overall survival of MGUS based on funding. MGUS: monoclonal gammopathy of undetermined significance

    Discussion

    We have conducted the first study to examine the impact of health care insurance on the outcomes of patients with multiple myeloma. Previous studies examined the role of poverty and socioeconomic status on the outcome of patients with MM but until now there was no study looking into the role of health care insurance on the survival of patients with this disease. In our study, we found that the funded patients diagnosed with MM and MGUS, the precursor of MM, have significantly better median, 5-year and overall survivals than patients without insurance. The insurance status was analyzed at the time of diagnosis and did not take into account change of insurance status during the course of the illness. It could be presumed that funded patients had better access to medical care, thereby allowing for earlier diagnosis; less advanced disease, and hence improved survival. However, there was no statistically significant difference in the distribution of disease stage between the funded and non-funded groups. Another feature of MM that could potentially influence the outcomes is the biology of the disease as reflected by the presence of disease risk features. However, the Mayo Clinic risk stratification criteria were similarly distributed between the funded and non-funded patients.

    While insurance did not appear to affect various parameters at the time of diagnosis, it is possible that subsequent treatment might be adversely affected. However, at our institution the same physicians treat patients in the same clinic setting, with the same treatment protocols regardless of payer status. As the possibility of treatment differences between the two groups leading to improved survival of one group over the other seems less likely, our results suggest that having health care insurance, with easier access to health care, is probably an independent predictor of survival in patients with MM and MGUS. We are currently investigating whether comorbid conditions at the time of diagnosis are affecting response to therapy and subsequent outcomes. It could be argued that the death of patients with MGUS is usually more likely to occur from comorbidities than from progression to MM, as the conversion rate of MGUS to MM is 1% per year, and hence since the impact of health care insurance on survival is greater in MM than MGUS, the effects are more likely to be direct (diagnosing earlier disease progression), particularly in view of the recent knowledge that MM is inevitably preceded by MGUS.[3,4]

    The survival differences relative to race and gender were not statistically significant. Prior studies have demonstrated either no difference or improved survival for one group or the other. Most recently, analysis of the SEER data demonstrated superior survivals in African Americans but with improving survival in Caucasians, but not African Americans, with time over the study period of 1973 to 2005.[6,7] The last observation suggested differential access to newer therapies. However, we noted that survival was similar for all stages of disease and in a preliminary review of treatments that there were no differences in use of newer modalities. Our results suggest that the effects of socioeconomic status on outcomes can be overcome by the expertise of an academic center where patients are treated by faculty dedicated to the treatment of MM.

    The strengths of our study are that it showed consistent results in regards to the impact of health care insurance in patients with both MM and MGUS. Our finding is not the consequence of differences in stage distribution or high-risk features, adding impetus to the independent effect of insurance status on the outcomes of MM. As the patients were treated in a health care facility with equal access regardless of payer status, we eliminated the confounding effects of the influence of advanced therapeutic options such as SCT and IMDs. As the patients came from about 60 of Louisiana’s 64 parishes (counties) it is difficult to ascertain the exact causes of death of all the patients, thereby making the calculation of disease specific survival rates difficult. With the advent of health care reform and insurance coverage for nearly all Americans, it is possible that outcome differences will be minimized in the future. However, the effects of insurance status on outcome presumably reflects the effect of various exogenous factors such as the lifestyle factors including diet, exercise, alcohol, tobacco, etc. as well as compliance issues and hence as these factors will not be eliminated by health care insurance it is important to understand how they influence the disease outcome.

    In conclusion, our study showed that patients with multiple myeloma and MGUS with health care insurance have longer overall survival when compared to non-funded patients. There was no difference in survival in our patient population based on race or gender. Further studies are needed to explore the various factors through which health care insurance impacts the disease outcomes.

    Authors’ contributions

    Designed the entire project, reviewed the data and drafted the manuscript: S.S. Devarakonda, F. Turturro, J. Glass

    Contributed to finalizing the manuscript: R. Munker

    Analyzed the data as cancer epidemiologist: R. Shi

    Assisted in the preparation of the manuscript: E. Friday

    Acknowledgments

    We are grateful to all the patients and their families who have contributed to the data of this work.

    Financial support and sponsorship

    None.

    Conflicts of interest

    There are no conflicts of interest.

    Patient consent

    Waiver of consent and authorization was obtained from LSU Health Internal Review Board.

    Ethics approval

    The study has been approved by LSU Health Internal Review Board, IRB approval # E10-005.

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