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Research ArticleClinical Studies

Chemotherapy or Combined Modality Therapy for Early-stage Hodgkin Lymphoma

JORDAN A. TOROK, YUAN WU, JUNZO CHINO, LEONARD R. PROSNITZ, ANNE W. BEAVEN, GRACE J. KIM and CHRIS R. KELSEY
Anticancer Research May 2018, 38 (5) 2875-2881;
JORDAN A. TOROK
1Department of Radiation Oncology, Duke University, Durham, NC, U.S.A.
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YUAN WU
2Department of Biostatistics and Bioinformatics, Duke University, Durham, NC, U.S.A.
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JUNZO CHINO
1Department of Radiation Oncology, Duke University, Durham, NC, U.S.A.
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LEONARD R. PROSNITZ
1Department of Radiation Oncology, Duke University, Durham, NC, U.S.A.
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ANNE W. BEAVEN
3Department of Medicine, Division of Medical Oncology, University of North Carolina, Chapel Hill, NC, U.S.A.
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GRACE J. KIM
1Department of Radiation Oncology, Duke University, Durham, NC, U.S.A.
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CHRIS R. KELSEY
1Department of Radiation Oncology, Duke University, Durham, NC, U.S.A.
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  • For correspondence: christopher.kelsey@duke.edu
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Abstract

Background/Aim: Optimizing treatment of early-stage Hodgkin lymphoma (HL) requires balancing cure with potential acute and late toxicities from treatment. We reviewed our institutional experience with chemotherapy alone (ChT) versus combined modality therapy (CMT). Materials and Methods: Patients with stage I-II classical HL in a complete response (CR) by functional imaging after chemotherapy were included. Progression-free survival (PFS) and overall survival (OS) were calculated and a multivariate analysis (MVA) was performed. Results: A total of 136 patients with a CR to chemotherapy were identified. Consolidation radiation therapy (RT) was administered to 117 while 19 received no further therapy. PFS (5 years) was 97% with CMT and 84% with chemotherapy alone (p=0.02). Long-term (10 year) survival was no different (96 vs. 94%, p=0.8). On MVA, CMT improved PFS. Secondary malignancies were rare and no cardiac events were observed. Conclusion: Consolidation RT results in superior PFS in early-stage Hodgkin lymphoma with minimal added toxicity.

  • Radiation therapy
  • consolidation
  • positron emission tomography
  • complete response
  • metabolic imaging

Hodgkin lymphoma (HL) most commonly develops in young adults and is effectively treated in the overwhelming majority of patients with current treatment programs. This has driven efforts to maintain high cure rates while minimizing long-term toxicity of therapy. The optimal strategy to accomplish these two, potentially conflicting, objectives is controversial.

The management of early-stage HL is currently based on categorization into favorable and unfavorable subgroups (1), with bulky disease being a special category among those with unfavorable disease. Chemotherapy followed by consolidation radiation therapy (RT), commonly referred to as combined modality therapy (CMT), is considered standard in the setting of bulky disease. For patients without bulky disease, whether favorable or unfavorable, there is significant dispute whether chemotherapy alone or CMT is optimal. While CMT has consistently demonstrated superior disease control in numerous randomized trials compared to chemotherapy alone, the effect on overall survival has been mixed (2-5). Most of these studies were performed without metabolic imaging such as positron emission tomography (PET). A large database analysis found CMT use has declined over the past decade with only 45% of patients receiving such in 2011 (6).

CMT has generally been the preferred approach at our Institution. For the last 20 years, metabolic imaging, initially gallium and more recently position emission tomography-computed tomography (PET-CT), has been utilized to assess chemotherapy response. In complete responders, consolidation RT has been the common practice with radiation dose based on risk group classification and number of chemotherapy cycles received (7, 8). We herein report our institutional experience of early stage HL in complete metabolic response after chemotherapy treated with or without consolidation RT, with a specific focus on long-term disease control and toxicity.

Materials and Methods

This institutional review board-approved retrospective study identified all patients treated at Duke University Medical Center for stage I-II classical HL from 1992-2012. Those with nodular lymphocyte predominant disease were excluded. Histology was confirmed by hematopathologists at our institution based on the World Health Organization criteria (9). For all patients, histologic subtype, stage, number of nodal areas by German Hodgkin Study Group (GHSG) criteria, erythrocyte sedimentation rate (ESR), presence of B symptoms, extranodal disease, and presence of large mediastinal adenopathy (bulky disease) were noted. Baseline imaging studies consisted of computed tomography (CT) supplemented with gallium imaging in the early time period and PET-CT in the later time period. Stage was based on the Ann Arbor classification (10). Patients were categorized into favorable and unfavorable risk groups according to the GHSG criteria, including large mediastinal adenopathy (LMA, ≥one-third maximum transverse thoracic diameter on PA chest radiograph), extranodal involvement, more than two involved lymph node areas, or an unfavorable B symptom/erythrocyte sedimentation rate profile (≥50 mm/h without B symptoms or ≥30 mm/h with B symptoms) (1).

Chemotherapy regimen and number of cycles were at the discretion of the treating medical oncologist but typically consisted of adriamycin, bleomycin, vinblastine and dacarbazine (ABVD). All patients in the analysis underwent chemotherapy response assessment using interim and/or post-treatment functional imaging (gallium or PET-CT). Patients who did not undergo such assessment were excluded. All PET-CT studies were read by an attending nuclear medicine physician. Visual assessment pre-dated regular use of Deauville scoring criteria and were generally scored as negative if FDG-uptake was less than in the mediastinal blood pool. Only patients who achieved a complete response to chemotherapy by gallium or PET-CT were included in this analysis, as chemotherapy alone would not be sufficient in the setting of an incomplete response.

For those who received CMT, RT generally followed involved-field guidelines (11), with the original sites of disease treated with a margin to account for imaging uncertainties and day-to-day setup errors. The total dose and fractionation schedule was at the discretion of the treating radiation oncologist.

Statistics. Two sample t-test, Pearson's Chi-squared test and Wilcoxon rank sum test were used to compare CMT and chemotherapy alone patient characteristics. Kaplan-Meier survival curves were generated to calculate progression-free survival (PFS) and overall survival (OS) from the date of initial diagnosis. PFS events included lymphoma progression or death, with patients censored at the last follow-up at our institution. Overall survival was calculated from the date of diagnosis to date of death. For patients who were lost to follow-up at our institution, an institutional registry was utilized to capture mortality events. Cumulative incidence of second malignancy and crude rates of hypothyroidism were calculated. Hypothyroidism was scored if thyroid hormone replacement therapy was initiated based on clinical and laboratory findings. Cox regression was used for group comparisons. Prognostic factors included in the multivariate Cox modelling were treatment modality, age, favorable vs. unfavorable classification and number of cycles of chemotherapy. Other long-term toxicities were also captured including cardiac events and secondary malignancies.

Results

A total of 337 patients were treated for Hodgkin lymphoma at our institution between 1992 and 2012. After excluding patients without adequate diagnostic information (n=8), nodular lymphocyte-predominant histology (n=19), advanced stage disease (n=127), and treatment with RT alone (n=22), 161 patients with stage I/II disease remained who were treated with CMT or chemotherapy alone.

Following combination chemotherapy, an additional 25 patients were excluded because of an incomplete metabolic response or lack of metabolic imaging. This left 136 patients with a documented complete metabolic response, 48 confirmed by gallium and 88 by PET-CT. Chemotherapy consisted of ABVD (86%) or ABVD-hybrids (6%) in the majority of patients. The median number of cycles was 6 (range=2-8 cycles). Consolidation RT was administered to 117 while 19 received no further therapy. In the CMT group, the median radiation dose was 24 Gy (range=18-36 Gy) administered in 1.5-2 Gy daily fractions. Patient and treatment characteristics can be found in Table I. Notable differences included more frequent staging with PET-CT (versus gallium) and greater proportion of females in the chemotherapy alone cohort.

Clinical outcomes. Median follow-up for survival was 9 years (interquartile range (IQR)=5.3-15) and for toxicity and progression endpoints was 5 years (IQR=2.6-8.3). For all patients, 5 and 10-year progression-free survival was 95% (95%CI=89-98%) and 91% (95%CI=82-96%). For CMT and chemotherapy alone patients, 5-year progression-free survival was 97% (95%CI=91-99%) and 84% (95%CI=57-94%), respectively (HR 0.21, 95%CI=0.05-0.91, p=0.02; Figure 1). Corresponding 10-year values were 93% (95%CI=82-97%) and 84% (95%CI=57-94%), respectively. On multivariate analysis, use of CMT was the only predictor of improved progression-free survival (p=0.04).

For the entire cohort, 5 and 10-year overall survival were both 96% (95%CI=90-98% at 10 years). OS at 10 years for CMT was 96% (95%CI=90-99%) and for chemotherapy alone was 94% (95% CI=65-99%) (HR 0.76, 95%CI=0.09-6.29, p=0.80; Figure 2). On multivariate analysis, CMT was not associated with improved survival. The only statistically significant factor was young age (p=0.04).

Treatment after relapse. For those who relapsed, median time to progression after the completion of chemotherapy alone and CMT was 10 and 16 months, respectively. All three relapses in the chemotherapy alone group were at sites of initial disease involvement with one patient also having distant progression. One patient never achieved a second remission after multiple systemic therapies and is currently alive with disease and on brentuximab. One patient relapsed despite receiving a tandem autologous/non-myeloablative allogeneic stem cell transplant (SCT) and died of disease. One patient is alive and disease-free after salvage chemotherapy and autologous SCT.

In the CMT group, there were five confirmed relapses-two were in the previously irradiated field and three at distant sites. Two patients with isolated recurrences received local therapy, one with surgical excision and the other with additional RT. The remaining patients received salvage chemotherapy followed by autologous SCT. With a median follow up after recurrence of 7 years, there have been no deaths.

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Table I.

Patient and treatment characteristics.

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Table II.

Secondary malignancies.

Figure 1.
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Figure 1.

Kaplan-Meier curve of progression-free survival comparing combined modality therapy and chemotherapy alone.

Toxicity. Secondary malignancy risk in the CMT and chemotherapy alone groups was nearly equivalent at 10 years, with 3% (95%CI=1-8%) and 6% (95%CI=1-35%), respectively (Table II and Figure 3). On multivariate analysis CMT was not associated with an increased risk of secondary malignancy risk (HR 0.50, 95%CI=0.06-4.40, p=0.5). Only one secondary malignancy, a papillary thyroid cancer, developed in the chemotherapy alone group. There were seven secondary neoplasms in the CMT group. These included acute myelogenous leukemia, follicular lymphoma, diffuse large B-cell lymphoma, small cell lung cancer, colon cancer, and two basal cell carcinomas. There were no cases of breast cancer. The small cell lung cancer was the only malignancy clearly arising within the RT field, occurring in an active smoker (13 years) after treatment. Three patients died of their secondary malignancies (acute myelogeneous leukemia, diffuse large B-cell lymphoma and small cell lung cancer).

A total of 28 patients in the CMT group developed hypothyroidism (24% crude incidence). There were no cardiac events during the follow-up period. No other significant late effects were noted.

Discussion

CMT and chemotherapy alone are both considered acceptable treatment approaches for early stage Hodgkin lymphoma, though CMT is considered standard for patients with bulky disease. As compared to chemotherapy alone, CMT has consistently resulted in superior disease control (4, 12). Our experience, in which all patients were in a complete response by functional imaging after combination chemotherapy, also demonstrated improved progression-free survival with CMT in early-stage HL. This aligns with findings from the randomized RAPID study which demonstrated a higher risk of relapse with chemotherapy alone even when a complete response by PET-CT was achieved with ABVD (5).

The absolute improvement in progression-free survival in our series was ~10% which is consistent with other studies. Identifying those patients with residual disease after chemotherapy that would most benefit from consolidation RT has been elusive. A negative post-chemotherapy PET-CT is not informative, evidenced by both the RAPID (5) study and an Italian randomized trial (13). Interim PET-CT, while highly prognostic, has not proven to be discriminatory based on the EORTC H10 study (14). Further studies are underway evaluating interim PET-CT by multiple cooperative groups. Admittedly, the majority of patients are ostensibly cured with chemotherapy alone. Additional efforts beyond PET-CT, incorporating underlying biological behavior, will likely prove necessary to identify the subset of patients who would most benefit from the addition of consolidation RT.

Figure 2.
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Figure 2.

Kaplan-Meier curve of overall survival comparing combined modality therapy and chemotherapy alone.

Despite improved disease control with CMT, concern about the late toxicity of RT and its potential impact on long-term survival has likely led to decreased utilization of CMT (6). Fortunately, there have been significant advances in radiation therapy delivery systems, an appreciation that lower doses are sufficient in all subgroups (7, 8), and utilization of smaller RT fields (7, 8). Smaller fields and lower doses decrease the risk of both secondary malignancies (15-17) and cardiac toxicity (18, 19), thereby improving the therapeutic ratio of RT. Our study showed excellent long-term survival in CMT patients treated with a modern paradigm with no cases of cardiac toxicity and only two secondary malignancies that may have been attributed to RT (small cell lung cancer and AML). Longer follow-up is always desirable when assessing late effects of therapy.

Survival is a challenging endpoint in HL as some patients are salvaged with autologous stem cell transplantation and those who are not can live for many years with active disease. This is also an issue in large randomized trials of early-stage Hodgkin lymphoma where progression-free survival is typically the primary endpoint. A systematic review and meta-analysis of five randomized controlled trials which included 1,245 patients did, however, show improved overall survival in patients treated with CMT compared to chemotherapy alone (12). A recent analysis of a large national database has also shown chemotherapy alone results in inferior survival compared to CMT (6). While high dose chemotherapy followed by autologous stem cell rescue can salvage some patients, it has been reported to be successful in only ~50% of patients who respond to initial second-line therapy and carries a significant risk of both treatment-related morbidity and mortality (20).

At our institution, patients with early-stage favorable disease are managed with 2 cycles of ABVD followed by 20 Gy of RT, based on the results of German Hodgkin Study Group (GHSG) HD10 (8). For patients with bulky mediastinal disease, we most frequently give 6 cycles of ABVD followed by 20 Gy of RT (7). The same approach is commonly utilized in young patients, particularly females, with mediastinal and axillary disease where the risk of long-term adverse effects by 30 Gy of RT is of concern. After 4 cycles of ABVD for early-stage unfavorable disease, we do recommend 30 Gy based on GHSG HD11 (21).

Figure 3.
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Figure 3.

Cumulative incidence of secondary malignancies comparing combined modality therapy and chemotherapy alone.

As with all retrospective studies, there are limitations to our analysis. As our Institution typically prefers a CMT approach, there was only a relatively small number of patients treated with chemotherapy alone, who also had shorter follow-up than the CMT group. While follow-up was adequate to assess progression-free survival, longer follow-up is required to assess survival and the risk of late effects adequately.

Footnotes

  • This article is freely accessible online.

  • Received March 1, 2018.
  • Revision received March 16, 2018.
  • Accepted March 19, 2018.
  • Copyright© 2018, International Institute of Anticancer Research (Dr. George J. Delinasios), All rights reserved

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Anticancer Research: 38 (5)
Anticancer Research
Vol. 38, Issue 5
May 2018
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Chemotherapy or Combined Modality Therapy for Early-stage Hodgkin Lymphoma
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Chemotherapy or Combined Modality Therapy for Early-stage Hodgkin Lymphoma
JORDAN A. TOROK, YUAN WU, JUNZO CHINO, LEONARD R. PROSNITZ, ANNE W. BEAVEN, GRACE J. KIM, CHRIS R. KELSEY
Anticancer Research May 2018, 38 (5) 2875-2881;

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Chemotherapy or Combined Modality Therapy for Early-stage Hodgkin Lymphoma
JORDAN A. TOROK, YUAN WU, JUNZO CHINO, LEONARD R. PROSNITZ, ANNE W. BEAVEN, GRACE J. KIM, CHRIS R. KELSEY
Anticancer Research May 2018, 38 (5) 2875-2881;
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