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Many patients with potentially curable cancer do not complete their prescribed treatment regimens because of the toxicity. There is evidence that the common endpoints of many of these toxicities are amenable to quality of life (QOL)-directed interventions.
This study was conducted to determine the effect of a multidisciplinary QOL-directed intervention on patients’ adherence to planned chemoradiation (CR) regimens.
The results of two randomized controlled trials that utilized the same QOL intervention were pooled to form a cohort of 61 patients with advanced localized gastrointestinal (GI) cancer. Of these 61 subjects, 29 participated in six to eight bi- to triweekly sessions that included exercise, education and relaxation, and 32 received usual medical care. The primary endpoint was completion of their prescribed CR regimens. Secondary outcomes included hospitalization during CR, rates of adverse postoperative events, and complete pathological response in those undergoing neoadjuvant therapy.
Significantly more members of the intervention than the control group completed their planned CR regimens (77.8 vs. 38.2%, P = 0.003). More participants in the control (n=14) than the intervention (n=5) group (P = 0.063) required hospitalization. Among those undergoing neoadjuvant CR, those in the intervention group were significantly more likely to complete CR as planned (81.0% vs. 37.5%, P = 0.005) and less likely to be hospitalized (14.3% vs. 50.0%, P = 0.011).
A structured multidisciplinary QOL-directed intervention delivered to patients undergoing CR may increase the proportion of patients who complete CR as planned and reduce unplanned hospitalizations. Utilization is an important outcome in QOL-directed intervention trials.
Many patients with advanced cancer choose to undergo multi-modal treatment involving chemotherapy, radiation and surgery.1 This decision is potentially curative; however, the agents used may be toxic and poorly tolerated despite our best efforts to provide supportive measures and tailor dosages. The result can be catastrophic as many patients, particularly the elderly, do not complete their planned regimens as scheduled,2–4 and this lack of adherence has been posited to contribute to decreased survival rates.5,6
Whereas some side effects of cancer treatment may be more apparent to the physician (e.g., myelosuppression), others such as diarrhea, nausea, vomiting, and pain confront patients on a daily basis. It is common for such adverse symptoms to co-occur among patients receiving combined chemoradiation (CR), and to undermine important clinical outcomes, e.g., peri-operative morbidity and survival.7–9 In concert, these symptoms may ultimately produce what the patient perceives as intolerable levels of fatigue, functional decline, and dysphoria, which influence clinicians’ decisions to reduce, terminate, or delay treatments.10–14 In effect, potentially life-saving therapy may be abandoned because of its overwhelming degradation of a patient’s quality of life (QOL). Fortunately, research suggests that psychosocial support and exercise during treatment may reduce adverse symptoms and enhance patients’ adherence to planned anticancer treatment.15–18 Additionally, exercise as “prehabilitation” prior to or concurrent with cancer treatment reduces morbidity for some cancer populations.19,20
Thus, physical activity and QOL are not second-order considerations in a patient’s multimodal treatment plan. At times they may factor in their survival. Given this, it is surprising that a literature review reveals little emphasis directed towards enhancing physical activity or preserving QOL during CR, or prior to surgery for patients receiving neoadjuvant treatment. The marked dearth of research that characterizes gastrointestinal (GI) cancers, in particular, is troubling as the CR-associated side effects for patients undergoing treatment for these cancers may be particularly severe and increase the morbidity of subsequent surgeries.9,21
It seems important to gain additional knowledge about the potential impact of exercise- and QOL-directed interventions on patient tolerance and adherence to their CR regimens, as well as on surgical outcomes following neoadjuvant CR. We, therefore, studied this question with a posthoc analysis of the data of the participants with locally advanced GI cancers who participated in two QOL-directed intervention trials that featured exercise as a key component.17,18
Our research team has conducted two Institutional Review Board-approved randomized clinical trials to assess the effectiveness of a multidisciplinary QOL-focused intervention among patients receiving radiation for late-stage cancer.22,23 The two trials utilized the same structured interventions and differed only in that the second trial included six rather than the eight sessions of the first, and involved the inclusion of caregivers. Participants with GI cancers in the two trials were pooled in order to reduce heterogeneity by balancing chemotherapeutic agents, radiation doses, and their potential toxicities between the study groups, and to more accurately estimate the effect of the intervention on: 1) CR completion rates in light of reported associations between QOL and adherence to planned therapy for locally advanced GI cancers,4,14 2) unplanned hospitalizations during CR given evidence linking psychosocial support during CR to reduced health care utilization,18 and 3) surgical outcomes post neoadjuvant CR given the exercise emphasis of the intervention and recent reports of reduced peri-operative morbidity with exercise-based “prehabilitation” for GI cancers. 19,20 Only participants with GI cancers were receiving neoadjuvant CR in the previous trials. Focusing on GI cancer enabled us to examine the utility of the intervention as “prehabilitation” given its emphasis on exercise and fitness. The data analyzed in this study differ from those previously reported for Studies 1 and 2 in that only findings related to patient reported outcomes (PROs) were reported in prior publications. Data regarding completion of CR, hospitalizations during CR, and perioperative morbidity (for participants receiving neoadjuvant treatment) were retrospectively abstracted exclusively for this study after the completion of both Studies 1 and 2. Vital status was also ascertained solely for this study. PROs were not included in the analyses for this study either as dependent variables or covariates.
The inclusion and exclusion criteria of the two trials were identical and have been described previously.22,23 Participants were required to be at least 18 years of age with late-stage cancer diagnosed within the past 12 months and requiring external beam radiation, a six-month or greater life expectancy, and an expected five-year survival of 50% or less.
Participants were randomly assigned to either a multidisciplinary QOL-directed intervention or usual medical care arm. The two studies enrolled a total of 253 patients (115 and 138 subjects, respectively), of whom 61 had cancers originating from the GI tract and gallbladder. The proportion of those having GI cancers did not differ significantly between the studies (25% and 23%) or between their intervention and control group assignments. As noted above, data from the two studies were pooled to create a cohort of 61 participants with GI cancer of which 29 received the QOL-directed intervention, and 32 usual medical care.
Both trials included structured group sessions, conducted two to three times per week, eight in Study 1 and six in Study 2, led by a psychiatrist or psychologist. Session content has been previously described and is summarized in Table 1.22,23 Each session had a theme that incorporated specific QOL domains and was designed to stand alone. Sessions opened with 20 minutes of gentle stretching and resistive exercise led by a physical therapist and closed with 10–20 minutes of guided relaxation.25 Depending on the theme, sessions were co-facilitated by a social worker, advanced practice nurse or certified hospital chaplain. Educational materials were provided for review and independent study of a session’s content.
The outcomes and covariates used in our analyses were obtained from two sources. The first consisted of the demographic and cancer treatment information collected during Studies 1 and 2. The second consisted of information retrospectively abstracted from participants’ Mayo Clinic electronic medical records (EMRs), after completion of Studies 1 and 2, regarding the perioperative courses of participants receiving neoadjuvant treatments, as well as the treatment tolerance of patients receiving both neoadjuvant and adjuvant CR. Retrospective EMR review was performed by two physicians blinded to participants’ group assignment. Disagreements were resolved though a consensus process involving simultaneous EMR review by both physicians. Data abstracted for all participants included:
Descriptive statistics for the total study cohort, treatment arms, and cancer-based subgroups were calculated using proportions for categorical and means for continuous variables. Inter-group differences were assessed with the X2 test for binary and independent t-tests for continuous variables. Logistic regression was utilized to estimate inter-group differences in hospitalization during CR and completion of the planned CR regimen for all participants. Among the subgroup of participants receiving neoadjuvant CR, logistic regression also was used to evaluate intergroup differences in the presence of postoperative complications, 30-day readmissions and the presence of a CPR. Ordinary least square regression was used to compare length of hospital stay between the groups. Cox proportional hazard models were used to compare survival between the study groups. Conventional model diagnostics were performed. All analyses were performed with Linux SAS v 9.3.
Table 2 lists the demographic and cancer characteristics of the study cohort. In summary, the pooled subgroup from the two studies did not differ significantly with respect to treatment arm assignment (P = 0.93). Participants were, on average, 62 years old and roughly half were female. While almost twice as many participants in the control group received cisplatinum and 5- Fluorouracil during CR, this difference did not reach statistical significance, P = 0.09. Forty- five participants underwent neoadjuvant CR and 37 went on to undergo surgical tumor resection, 17 (81.0%) intervention and 20 (83.3%) control group, P = 0.84.
Table 3 presents the results of logistic regression models for the study cohort as a whole. Significantly more members of the intervention than the control group completed CR treatment as planned (77.8 vs. 38.2%, P = 0.003). The significance of this finding was robust to adjustment for chemotherapy regimen. Similarly, while the results only approached statistical significance, a lower proportion of those in the intervention group (5 of 29) than in the control group (14 of 32) (P = 0.063) were hospitalized during CR.
Among the 45 participants undergoing neoadjuvant CR, those in the intervention group were significantly less likely to be hospitalized during CR; 14.3% (n=3) vs. 50.0% (n=12), P = 0.011, and more likely to complete CR as planned; 81.0% (n=17) vs. 37.5% (n=9), P = 0.005. The associations of study group with hospitalization and CR completion as planned were robust to adjustment by chemotherapy regimen as presented in Table 4. Study group assignment was not significantly associated with characteristics of participants’ hospitalizations for tumor resection after neoadjuvant CR including length of stay, presence of complications, or 30-day readmission. The rate of CPR did not differ between the groups.
Survival did not differ significantly between the groups when considering the total study cohort or the subgroup receiving neoadjuvant CR. The hazard ratio (HR) favored the intervention group as a whole, HR = 0.85, particularly the subgroup undergoing neoadjuvant CR, HR = 0.74; however, these findings were not statistically significant. Fig. 2, Panel A presents a Kaplan Meier curve by group for the cohort as a whole, and Panel B, for the subgroup undergoing neoadjuvant CR.
This study is, to the best of our knowledge, the first to suggest that participation in a multidisciplinary QOL-directed intervention may be associated with an improved likelihood of patients with cancer completing their prescribed CR regimen without interruptions or dose reductions. Our findings are particularly notable in two regards. First, the magnitude of the intervention’s effect is clinically meaningful. Over three-quarters of intervention participants relative to only one-third of their control group counterparts completed their CR course as scheduled. Second, it is also clinically significant that among participants receiving neoadjuvant CR, members of the intervention group were significantly less likely to be hospitalized during treatment. The apparent benefit to this subgroup is noteworthy given the high levels of treatment toxicity associated with this approach. Our findings suggest that future investigators should further explore the impact of QOL on adherence to cancer treatment recommendations and health care utilization.
It should be noted that differences were not found in a number of our secondary outcome measures. For example, the benefits of the intervention for the subgroup of participants that received neoadjuvant CR did not extend to their post-CR hospitalizations for tumor resection. Specifically, members of the intervention group did not differ from the control group in terms of rates of post-operative complications, CPR, 30-day readmission, or in hospital lengths of stay.
The few prior studies that have examined health care utilization in trials of QOL-directed interventions, whether in cancer or in other conditions, have seldom noted benefit.26 However, unlike our study, most trials enrolled patients in the far advanced/palliative stages of illness. Two additional distinctions may be important. The first may be the time horizon in that participants in this study were examined over a relatively brief interval, 4–6 weeks. The second is that they were receiving intensive CR for locally advanced GI cancers, a treatment regimen known to be associated with particularly high levels of morbidity, symptom burden and rehospitalization.10–13 The results of this study suggest that there may be a high yield, at least in terms of reducing utilization, in focusing QOL-directed activities at times of high patient vulnerability and treatment intensity.
Whereas the economic importance of reducing the frequency of hospital admissions is indisputable, the clinical relevance of completing CR as planned is less clear. The survival benefits of achieving a CPR have been established,27 and a causal association between treatment intensity and CPR has been proposed but not empirically validated.28 In this study, it is interesting that although not statistically significant, more participants who completed CR as planned achieved a CPR, 77% versus 23%. Completing CR as planned may be a surrogate for treatment tolerance or the extent/severity of patients’ symptom burden, clearly important constructs, but this interpretation remains unestablished.
The mechanism by which a QOL-oriented intervention can reduce the frequency of hospitalization remains speculative. Proposed explanations include: 1) enhanced patient self-efficacy and communication; 2) reduction of stress induced by symptoms such as insomnia, fatigue and lack of appetite; 3) lower levels of stress-induced circulating inflammatory cytokines, and 4) more proactive detection and treatment of problematic signs and symptoms. Unfortunately, we were not able to explore these possibilities in this investigation. Future studies would need to adopt clear theoretical frameworks with discoverable mediating factors if we are to enhance the effectiveness of QoL-directed interventions.
This study, as do all, has its strengths and weaknesses. Its novel findings and focus on QOL, treatment adherence and utilization of patients receiving CR for advanced cancer are among its strengths. Its principal limitation arises from the fact that even with the pooling of two very similar studies, the post hoc and exploratory nature of these analyses can legitimately be perceived as a limitation. Additionally, only GI cancer was examined, constraining the generalizeability of our findings. The decision to include patients with GI cancers was largely determined by our interest in the intervention’s impact on participants undergoing CR. Participants undergoing treatment for head and neck cancer comprised the only other subgroup in which more than half of participants were receiving radiation and parenteral chemotherapy. These participants had all recently undergone surgical resection of oropharyngeal tumors with uni- or bilateral neck dissections, making their morbidity risk profile distinct from that of other participants. Further, hospitalization for dehydration occurs frequently during CR for head and neck cancer.24 We hypothesized that this subgroup’s utilization would be less amenable to reduction through the QOL-directed intervention and consequently did not include them in the study. While we agree that a larger cohort would have been preferable, our sample of 61 was not miniscule and our findings, at least with respect to CR regimen adherence and rehospitalizations, were robust. The imbalance in the number of esophago-gastric malignancies and the type of CR received (Cisplatin-5FU) may be responsible, to some extent, for the differences in therapy completion. Additional studies, with more diverse samples, powered to more clearly define the impact of QOL-directed interventions on survival outcomes appear warranted.
A structured multidisciplinary QOL-directed intervention delivered to patients undergoing CR for advanced GI cancers may increase the proportion of those who complete treatment as planned and reduce unplanned hospital admissions.
This study was funded by the Linse Bock Foundation.
Disclosures : The authors have no financial disclosures or conflicts of interest.
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