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. 2017 Mar 16;17:200. doi: 10.1186/s12885-017-3194-8

Aprepitant for refractory cutaneous T-cell lymphoma-associated pruritus: 4 cases and a review of the literature

Johanna S Song 1,3,4, Marianne Tawa 2, Nicole G Chau 3, Thomas S Kupper 1,2,4, Nicole R LeBoeuf 1,2,4,
PMCID: PMC5356405  PMID: 28302100

Abstract

Background

Aprepitant is an FDA-approved medication for chemotherapy-induced nausea and vomiting. It blocks substance P binding to neurokinin-1; substance P has been implicated in itch pathways both as a local and global mediator.

Case presentations

We report a series of four patients, diagnosed with cutaneous T-cell lymphoma, who experienced full body pruritus recalcitrant to standard therapies. All patients experienced rapid symptom improvement (within days) following aprepitant treatment.

Conclusion

Aprepitant has been shown in small studies to be efficacious for treating chronic and malignancy-associated pruritus. Prior studies have shown no change in clinical efficacy of chemotherapeutics with concurrent aprepitant administration. These cases further demonstrate that aprepitant can be considered as a therapeutic option in malignancy-associated pruritus and further support the need for larger clinical trials.

Keywords: Cutaneous T-cell lymphoma, Aprepitant, Emend, Pruritus, Itch, Case report

Background

Aprepitant (Emend; Merck & Co Inc) has been approved for use as an antiemetic in patients receiving chemotherapy. It blocks the binding of substance P to its receptor, neurokinin-1, which plays a role in pathways that induce nausea and vomiting. Recently in the literature, there have been multiple successful case reports of aprepitant use for pruritus. We report four cases of successful use of aprepitant for generalized pruritus in patients diagnosed with cutaneous T-cell lymphoma (CTCL) and review the available clinical literature.

Case presentation

A 51-year-old woman presented with a 1.5-year history of lymphomatoid papulosis and extensive cutaneous anaplastic large cell lymphoma. The patient had experienced severe full-body itch with the diagnosis of her disease, which was moderately responsive to prednisone. She had previously been treated for her lymphoma with methotrexate and NB-UVB with no improvement in disease or itch. PUVA was tried and discontinued because of bullae development. She subsequently completed eight cycles of brentuximab, but had disease progression off treatment. She was then started on a clinical trial with an inhibitor of program death receptor 1 (PD-1), but was taken off the trial due to progressive disease. Itch persisted throughout her disease course. She began treatment with single-agent gemcitabine 6 weeks prior to the initiation of aprepitant and had persistent itch and disease with this.

On exam, she had multiple erythematous and skin-colored papules and plaques on her face, upper extremities, trunk and neck. She had no lymphadenopathy. Laboratory findings including serum chemistries, blood urea nitrogen, complete blood cell count, thyroid and liver function were normal.

Treatment with oral aprepitant, day 1, 125 mg; day 2, 80 mg; day 3, 80 mg was initiated with cycle 3, day 1 of gemcitabine chemotherapy (administered days 1, 8 of a 28 day cycle). Her symptoms improved three hours after aprepitant treatment from 10/10 to 0/10 for five days, but then her pruritus returned at 4/10 and increased thereafter until she took her next aprepitant dose with chemotherapy. On weeks where she did not take aprepitant, days 16–28, she experienced severe pruritus. She completed three cycles of gemcitabine with minimal response in her disease. Three weeks after aprepitant initiation, she underwent electron beam radiation therapy and began romidepsin. Aprepitant dosing was adjusted to every other day, with pruritus reaching 5/10 before the next dose and pruritus relief to 0/10 following every dose. Three months after aprepitant initiation, due to increased disease burden, brentuximab chemotherapy and surface conformal brachytherapy were initiated. Aprepitant dosing was then adjusted to every three days due to attempt to prolong reduced itch periods, as insurance coverage was challenging; she continued with pruritus reduction ranging from 4/10 to 0/10 for 1 year using this regimen.

Three additional patients with cutaneous T-cell lymphoma (CTCL) were treated with aprepitant for pruritus. The clinical findings of these patients are shown in Table 1.

Table 1.

Clinical characteristics of patients with symptoms of itch treated with aprepitant therapy

Source (year) No. of total patients No. of responding patients Complete vs. partial response Itch Scale Response by Scale Age, y/sex Primary cause of itch Dose of aprepitant Length of treatment
Patients with Malignancy Associated Itch
Duval et al. (2009) [20] 3 3 Partial VAS 9 to 2 N/A CTCL, SS 80 mg/d 7d
7 to 2
8 to 3
Vincenzi et al. (2010) [21] 2 2 Complete VAS 8 to 0 44F NSCLC on erlotinib d1: 125 mg; d2, 3: 80 mg; then 125 mg, 80 mg alternating 2m
Partial 9 to 1 74 M
Vincenzi et al. (2010) [22] 2 2 Complete VAS 8 to 0 N/A, M Metastatic soft tissue sarcoma d1: 125 mg; d2, 3: 80 mg 3d
Partial 9 to 1 N/A, F Metastatic breast carcinoma
Booken et al. (2011) [15] 5 4 Partial VAS Mean 9.8 to 4.3 56F CTCL, SS d1: 125 mg; d2, 3: 80 mg; every 2 weeks Median 15w (range 6–24)
65F CTCL, SS
65 M CTCL, SS
51 M CTCL, MF
Mir et al. (2011) [23] 1 1 Partial Subjective Pruritus regressed 54, N/A NSCLC on erlotinib 80 mg/d 14d
Ladizinski et al. (2012) [24] 1 1 Partial VAS 10 to 1 66 M CTCL, MF 80 mg/d; 3×/week 4m
Santini et al. (2012) [14] 24 41 Complete VAS Median, 8 to 0 42-76 M/F Refractory itch, metastatic solid tumor d1: 125 mg; d3, d5: 80 mg 1w
21 Partial Median, 8 to 1 45-70 M/F Naïve to treatment, metastatic solid tumor
Torres et al. (2012) [25] 2 2 Partial VAS 8 to 2 N/A CTCL, SS 80 mg/d 15d, then every other d for 10d
9 to 3
Jimenez Gallo et al. (2013) [26] 1 1 Partial VAS 10 to 2 41F CTCL, MF d1: 125 mg; d2, 3: 80 mg; every 2 weeks N/A
Borja-Consigliere et al. (2014) [27] 1 1 Partial VAS 10 to 3 61F CTCL d1: 125 mg; d2, 3: 80 mg; every 2 weeks 13m
Villafranca et al. (2014) [28] 1 1 Partial VAS 9 to 5 after two weeks, then to 4 after one month 27F Hodgkin’s lymphoma 80 mg/d 1m
Present cases (2017) 4 4 Complete NRS 10 to 0 51F CTCL, lymphomatoid papulosis/cutaneous anaplastic lymphoma d1: 125 mg; d2, d3: 80 mg 3w; then every 3d for 12m
Partial 10 to 6; after 8 months to 2; during non-treatment weeks pruritus increases to 6 68F CTCL, MF every 2w for 10m
10 to 2; during non-treatment weeks pruritus increased back to 10 64 M every 2w for 6m
10 to 4 59 M 1m
Patients with Chronic Itch, Non-malignancy Associated
Ally et al. (2013) [29] 1 1 Partial Subjective Vast improvement 61F Brachioradial pruritus 80 mg/d 2w
Complete 8 to 0 66F Multifactorial (hyperuricemia, iron deficiency)
8 to 0 50F Unknown
Stander et al. (2010) [13] 20 16 Partial VAS 8 to 1 42 M Multifactorial (thyroid dysfunction, neurogenic) 80 mg/d 6.6d (range 3–13)
10 to 3 59F Multifactorial (metabolic syndrome)
10 to 4 73F Multifactorial (renal, diabetes)
10 to 5 55F Multifactorial (cholestatic, dry skin, psychosomatic factors)
10 to 5 52F Unknown
8 to 4 78 M Renal
6 to 3 72 M Unknown
8 to 5 36 M Unknown
7 to 4 72 M Renal
5 to 3 66F Multifactorial (renal, dry skin)
7 to 5 69 M Renal
10 to 8 82F Multifactorial (renal, hyperuricemia)
7 to 6 81F Unknown
10 to 9 85F Unknown

Abbreviations: N/A not available, d days, w weeks, m months, y years, VAS visual analogue scale, NRS numeric rating scale, CTCL cutaneous T-cell lymphoma, SS Sezary syndrome, MF mycosis fungoides, NSCLC non-small cell lung cancer

Discussion

Itch in the oncology patient presents an additional challenge that may dramatically affect quality of life in those already facing a cancer diagnosis and adverse effects from antineoplastic therapies. Pruritus is thought to be a multifactorial symptom that may be induced by local skin immune responses as well as global neurological pathways. Local cutaneous pathways are mediated by itch-selective C nerve fibers, whose signals are augmented by local T cells, mast cells, cytokines and neuropeptides. The C nerve fibers synapse with second-order projections, which continue to transmit signals to the thalamus for processing [1].

Aprepitant, approved for use in chemotherapy-induced nausea and vomiting in 2003, has been used with increasing frequency for this indication both as a stand-alone treatment and as part of combination regimens. This medication is well tolerated. In a systematic review including 8740 patients treated with aprepitant, statistically significant differences in fatigue and hiccups as well as infections were seen; of note the patients contributing to increased infections were from a single study where high doses of dexamethasone were used concomitantly [2, 3]. Aprepitant is a neurokinin-1 (NK1) receptor antagonist that can cross the blood-brain barrier; it prevents substance P from binding to its NK1 receptor. Substance P, a tachykinin neuropeptide, mediates nausea pathways in the brainstem as well as itch pathways from the skin to spinal cord [4]. Injected substance P into the skin of non-atopic patients induces an itch response in normal and inflamed skin [5]. Atopic dermatitis patients have been observed to have increased substance P-positive and NK1 receptor-immunoreactive nerve fibers as compared to healthy controls [6]. Substance P has been shown to bind NK1 receptors on keratinocytes, which activate mast cell degranulation and release of cytokines and chemokines such as histamine, prostaglandin D2 and leukotriene B4, which mediate itch [7]. NK1 receptors are also present in rat dorsal horn neurons, which may play a role in neurologic itch [8]. The importance of these neurotransmitters specifically in oncology patients has not been studied and their roles require further research.

Pruritus is sometimes a non-specific presenting complaint of underlying malignancy. While this is most often described with Hodgkin’s disease, it is also reported with many solid tumors such as those originating in the breast, gastrointestinal system and liver. In small studies of patients with non-specific generalized itching, underlying malignancy was found to be the cause of itch in fewer than 10% of patients [9]. Appropriate assessment of true, diffuse pruritus symptoms includes an age and symptom appropriate malignancy evaluation. The pathophysiology of malignancy and itch has yet to be clearly elucidated; however, many mediators have been suggested to play a role. Recent studies propose that the T-cell dysregulation associated with Hodgkin’s lymphoma contributes to high rates of pruritus associated with this malignancy [10] and the cytokines IL-6, IL-8, and IL-31 may also play roles in lymphoma-associated or chronic itch [9]. In our reported cases, patients suffered from cutaneous lymphoma, which unlike pruritus without a rash, has multiple potential contributors to itch symptoms. These patients were concurrently treated for their primary malignancy with variable response. Although malignancy treatment may also relieve pruritus, in all of our cases, patients had previously failed conventional treatments for itch for many months prior. Our cases also reported pruritus cessation within hours to days after aprepitant treatment, in the setting of progressive or persistent malignancy, suggesting that aprepitant has a direct effect on symptom relief. Prior reports also suggest that patients suffered rebound itch upon cessation of aprepitant with continuation of chemotherapy, suggesting a role for aprepitant’s direct involvement in pruritus relief.

Aprepitant is metabolized through the cytochrome P450 system, specifically CYP3A4. It moderately inhibits CYP3A4, induces CYP2C9 and possibly affects other isoenzymes. As such, medication interactions, specifically with chemotherapeutic drugs metabolized by these enzymes should always be considered [11]. However, studies in patients concurrently treated with aprepitant and docetaxel, vinorelbine or cyclophosphamide have not shown clinically significant decreases in chemotherapeutic serum concentrations [12].

To date, at least 74 patients in the literature have been reported to experience pruritus relief with aprepitant treatment (Table 1). In prospective studies, pruritus relief has been reported in 80–91% of patients, suggesting that aprepitant may be uniquely effective against itch, especially in patients with symptoms refractory to standard treatments [1315]. Because itch pathways have not been fully elucidated and are likely activated through more than one process in the oncology patient with inflammatory skin lesions, deactivating itch likely requires a multi-faceted approach. With persistence of an inflammatory malignancy, the trigger of the itch response persists and it is expected that the itch will recur. In addition, chemotherapeutic regimens may result in modified pathways via effects on the skin and small nerve fibers. When multiple potential causes of itch exist, combination therapy with conventional anti-itch agents may be helpful; emollients, topical steroids, antihistamines, gabapentin, pregabalin, mirtazapine, ultraviolet light and tricyclic antidepressants should be considered depending on patient findings, comorbidities and with consideration of medication interactions. These can be adjusted to bridge non-aprepitant days and in instances of treatment delays due to medication access.

In small studies, aprepitant has been shown to be both safe and effective in treatment of malignancy-associated and refractory chronic pruritus. In 10 patients with an atopic diathesis, aprepitant reduced itch >40% in 9/10 patients [13]. Further research is needed to evaluate the patient population most likely to respond to aprepitant for pruritus, as it may be a tool for malignancy-associated itch, as well as in inflammatory conditions associated with chronic pruritus. However, as demonstrated in our table, there is significant heterogeneity in dosing regimens and duration of treatment. Practitioners have prescribed dosing either as 80 mg daily or in a tri-fold pack of 125 mg/80 mg/80 mg for 3 days to 24 weeks. While further studies are needed to determine the most effective dosing regimen in oncology patients, of the previous reports of six patients treated with aprepitant 80 mg daily, none experienced a complete response in pruritus. In our patients, we use tri-fold dosing of 125 mg/80 mg/80 mg, administered weekly if itch recurs after the first 3 doses. Given that our patients experienced an increase in pruritus symptoms on days without aprepitant treatment, until larger dosing studies are available, we continue treatment while patients are experiencing relief, as cessation may cause itch to return to baseline levels.

These cases demonstrate that the use of aprepitant may be helpful in patients with CTCL who experience pruritus refractory to conventional treatments. An estimated 66–88% of CTCL patients report experiencing pruritus with effects on quality of life [16, 17]. Reports that included Dermatology Life Quality Index (DLQI) score along with the visual analogue scale (VAS) demonstrated a high correlation between the two measures. Patients who experienced large improvements in pruritus symptoms by VAS had similar dramatic decreases in DLQI scores. The VAS is a commonly used tool for quantifying itch. It has been validated in patients with chronic itch or pruritic dermatoses with a high correlation with the numeric rating scale [18, 19]. Future studies exploring how itch impacts patient quality of life and the effectiveness of interventions such as aprepitant should consider patient-reported outcomes. A disease-specific scale may be of significant use in the oncology population.

Conclusion

We observed 4 cases of significant pruritus improvement in CTCL patients treated with aprepitant, supporting that this modality can be useful in treating some patients with malignancy-associated itch refractory to conventional treatments. There continues to be a need for larger comparative effectiveness trials of aprepitant in patients with chronic, malignancy and treatment-associated itch. Review of the literature demonstrated discrepancies in dose and timing of aprepitant regimens as well as outcome measures; prospective studies should evaluate dosing to discern the most effective administration schedule. Future study is imperative as oncology patients may experience negative impact on quality of life from treatment refractory pruritus.

Acknowledgements

The authors have no acknowledgements.

Funding

No funding was acquired for this study.

Availability of data and materials

The datasets generated and/or analyzed during the current study are not publicly available as they are patient information in an electronic medical record but are available from the corresponding author on reasonable request.

Authors’ contributions

NRL conceived the study, takes full responsibility of the manuscript, and oversaw all drafts of the manuscript. JSS, MT, NGC, and TSK reviewed patient charts. JSS drafted the majority of the manuscript. All authors were involved in drafting the manuscript. All authors read and approved the final manuscript.

Competing interests

Dr. Kupper serves on the advisory board for Adaptive Biotechnologies. All other authors including Dr. Song, Ms. Tawa, Dr. Chau, and Dr. LeBoeuf have no conflict of interest to declare.

Consent for publication

Written informed consent was obtained from all patients for publication of this case series and any accompanying images. A copy of the written consent is available for review.

Ethics approval and consent to participate

This study was approved by the Brigham and Women’s and Dana Farber Cancer Institute IRB.

Publisher’s Note

Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.

Abbreviations

CTCL

Cutaneous T-cell lymphoma

DLQI

Dermatology Life Quality Index

NK1

Neurokinin-1

VAS

Visual analogue scale

Contributor Information

Johanna S. Song, Email: JSHEU1@PARTNERS.ORG

Marianne Tawa, Email: tawa@dfci.harvard.edu.

Nicole G. Chau, Email: Chau@dfci.harvard.edu

Thomas S. Kupper, Email: TKUPPER@bwh.harvard.edu

Nicole R. LeBoeuf, Phone: (617) 632-6571, Email: NLEBOEUF@partners.org

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Associated Data

This section collects any data citations, data availability statements, or supplementary materials included in this article.

Data Availability Statement

The datasets generated and/or analyzed during the current study are not publicly available as they are patient information in an electronic medical record but are available from the corresponding author on reasonable request.


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