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Chemotherapy-Induced Nausea and Vomiting: Optimizing Prevention and Management

July 2012, Vol 5, No 4 - Clinical
Abstract

Background: Nausea and vomiting are serious side effects of cancer chemotherapy that can cause significant negative impacts on patients’ quality of life and on their ability to tolerate and comply with therapy. Despite advances in the prevention and management of chemotherapy-induced nausea and vomiting (CINV), these side effects remain among the most distressing for patients.

Objective: To discuss CINV and the current pharmacologic approaches to its management.

Discussion: This article outlines the mechanism of CINV, followed by a review of current approaches to pharmacologic therapy and current practice guidelines from national cancer organizations. This information will help providers and payers understand the optimal management of patients with CINV, including practical considerations and value-based decisionmaking that considers cost issues.

Conclusion: Numerous preventive and treatment options are available to manage CINV. Addressing antiemetic regimens requires ongoing patient evaluation to determine the best approach for each individual patient.

 

Am Health Drug Benefits.
2012;5(4):232-240

Nausea and vomiting are 2 serious and related side effects of cancer chemotherapy. These adverse effects can cause significant negative impacts on patients’ quality of life and on their ability to comply with therapy. Also, nausea and vomiting can result in anorexia, decreased performance status, metabolic imbalance, wound dehiscence, esophageal tears, and nutritional deficiency.1,2 Despite advances in the prevention and management of chemotherapy-induced nausea and vomiting (CINV), these side effects remain among the most distressing for patients. The use of emerging antiemetic medications has reduced the incidence of vomiting substantially, but evaluations show that approximately 30% to 60% of patients still experience either acute or delayed nausea after chemotherapy.3 Serial evaluations throughout the 1980s and into the 2000s show that, although vomiting has fallen further down on the list of side effects that patients perceive as being their most severe, nausea remains either the first or second most severe side effect of chemotherapy.4-8

Risk factors for CINV can be divided into patientspecific and treatment-specific risk factors. Female sex and history of motion or morning sickness are clear risk factors for nausea and vomiting.5,6 Younger age has also been correlated with increased risk, although this may be explained by the more aggressive chemotherapy regimens that tend to be administered to younger patients who have more aggressive diseases.5-7 Finally, alcohol intake tends to be inversely correlated with the risk of developing CINV. Many factors contribute to the treatment- specific risk, including (1) the emetogenicity of the agents being used, (2) the dose and schedule of each agent, and (3) in the case of radiation-induced or postoperative nausea, the site of radiation or surgery.

“Emetogenicity” refers to an agent’s tendency to cause nausea and/or vomiting. Initially described in 1997, the emetogenicity scale, also known as the Hesketh scale, divided chemotherapy agents and doses into 5 levels, based on their likelihood to cause CINV.9 Since then, the American Society of Clinical Oncology (ASCO) and the National Comprehensive Cancer Network (NCCN) have modified this scale to be divided into the following 4 categories10,11:

  • Highly emetogenic: medications or doses that cause CINV in >90% of patients
  • Moderately emetogenic: medications that induce CINV in 30% to 90% of patients
  • Low emetogenic: medications that are associated with CINV rates of 10% to 30%
  • Minimally emetogenic: medications that cause CINV in <10% of patients.

“CINV” is a broad term used to describe the many types of nausea and vomiting that can occur in patients with cancer. The major subtypes of nausea and vomiting associated with chemotherapy are12-16:

  • Acute: onset of nausea and vomiting within minutes to hours after administration of chemotherapy and resolving within 24 hours
  • Delayed: occurs 24 hours or later after administration of chemotherapy
  • Anticipatory: occurs before chemotherapy administration; thought to be an indicator of previous poor control of nausea and vomiting
  • Breakthrough/refractory: nausea and vomiting that occur despite appropriate prophylaxis; requires the use of rescue medications.

Because there are so many independent and variable risk factors that can influence the risk for CINV in any particular patient, it becomes paramount for providers to individualize the approach to the prevention and treatment of CINV in every patient case.

Pathophysiology of Nausea and Vomiting

The vomiting response is controlled centrally by the emetic center, which lies in the reticular formation of the brain stem. The emetic center receives input from 3 sources: the periphery, the cortex, and the chemoreceptor trigger zone. Peripheral pathways are mediated mainly by serotonin (5-hydroxytryptamine3 [5-HT3]) and neurokinin (NK). The cortical pathway, which is responsible for anticipatory emesis, is mediated by dopamine and histamine. The chemoreceptor trigger zone, which is a collection of neurons at the base of the brain and is exposed to the body’s general circulation, mediates signals through all of the above chemokines. Once the emetic center has been triggered, signals are then sent to the salivatory, vasomotor, respiratory, and cranial centers to activate the organs involved with the vomiting reflex, namely the abdominal muscles, diaphragm, stomach, and esophagus.17

Pharmacologic Treatment Options for CINV

Available Agents

Before the 1980s, CINV was primarily managed with dopamine receptor antagonists. Today, we have a multitude of options available, targeting the various pathways of the process, to use in the prevention and management of CINV.

5-HT3 receptor antagonists.Ondansetron was the first US Food and Drug Administration (FDA)-approved 5-HT3 antagonist in 1991. Early trials showed that ondansetron was an effective antiemetic for patients receiving cisplatin-based regimens, and they subsequently showed it to be superior to metoclopramide in patients receiving cisplatin and noncisplatin regimens.18-22 Currently, four 5-HT3 receptor antagonists are available in the United States—ondansetron, granisetron, dolasetron, and palonosetron. Palonosetron, the newest agent, was approved in 2003. These agents are believed to prevent CINV by antagonizing 5-HT3 receptors either peripherally on vagal nerve terminals and/or centrally in the chemoreceptor trigger zone.23-27 Since their introduction, 5-HT3 receptor antagonists have become part of the cornerstone for CINV prevention, thanks to their effectiveness and tolerable side-effect profile. The most common adverse effects reported (in their respective package insert) with these agents are headache and constipation. Transient elevation of liver function enzymes and QTc prolongation have also been noted.

NK1 receptor antagonists. NK1 receptor antagonists inhibit substance P in peripheral and central emetic pathways. Aprepitant was the first drug in this class to be approved by the FDA in 2003. Aprepitant was approved at doses of 125 mg orally on day 1 and 80 mg orally on days 2 and 3 for the prevention of nausea and vomiting in patients receiving highly emetogenic or moderately emetogenic single-day chemotherapy.28 Aprepitant was approved after 2 trials showed that the combination of aprepitant, ondansetron, and dexa - methasone decreased emesis or decreased the use of rescue medications for patients receiving highly emetogenic chemotherapy during the acute and delayed phases.29,30 The most common adverse effects include fatigue, headache, anorexia, diarrhea, hiccups, and increased transaminases.

Aprepitant is primarily metabolized by cytochrome (CY)P-450 3A4 with minor metabolism by CYP-1A2 and CYP-2C9.28,31 Aprepitant has been shown to be an inhibitor of CYP-3A4 and an inducer of CYP-2A9. Coadministration with corticosteroids such as dexa - methasone, a CYP-3A4 substrate, causes an increase in plasma concentrations of dexamethasone. Therefore, when aprepitant is given with dexamethasone for CINV prevention, the dexamethasone dose should be reduced. Because aprepitant is a weak inducer of CYP- 2C9, the metabolism of warfarin can be affected. A decrease of international normalized ratio has been noted with this combination, and patients should be monitored, although no empiric dose adjustments for warfarin are recommended.32

Fosaprepitant, which was approved in 2008, is a water-soluble prodrug of aprepitant that is administered intravenously before chemotherapy.33 Fosaprepitant is used as an intravenous (IV) 150-mg dose on day 1 only. The one-time 150-mg IV dose has been shown to be noninferior to the 3-day oral aprepitant regimen.34

Corticosteroids. Corticosteroids were first shown to be efficacious for CINV in the 1980s, and they are now considered a mainstay of antiemetic regimens for the prevention of acute and delayed emesis.10,11,35 Although not approved by the FDA for CINV, corticosteroids have been found to be beneficial when used alone for the prevention of nausea and vomiting in patients receiving low emetogenic chemotherapy and to improve efficacy when combined with 5-HT3 receptor antagonists in patients receiving moderately or highly emetogenic chemotherapies.36-39 Dexamethasone is the recommended corticosteroid according to current guidelines, although no studies have been performed comparing available corticosteroids.10,11

The mechanism of action of corticosteroids as antiemetic agents has not been elucidated, but it may be related to activity in the peripheral nervous system or in the central nervous system (CNS), and possibly by antagonizing serotonin receptors.40-43 Tolerability to corticosteroids can be a concern, because when used for the prevention of delayed nausea and vomiting, common adverse effects have included insomnia, epigastric discomfort, agitation, weight gain, and hyperglycemia.44

Additional Options

Dopamine receptor antagonists. Before the approval of the 5-HT3 antagonists, dopamine receptor antagonists were the primary antiemetics used for CINV. With the current availability of more effective preventive agents, dopamine receptor antagonists are mostly used in the management of breakthrough or refractory emesis. The dopamine antagonists are divided into phenothiazines (eg, prochlorperazine), butyrophenones (eg, haloperidol, droperidol), and substituted benzamides (eg, metoclopramide). These agents antagonize the dopamine (D2) receptor in the chemoreceptor trigger zone.45,46 Metoclopramide antagonizes dopamine, but at high doses it also has activity against the 5-HT3 receptor.47,48 Common side effects of dopamine receptor antagonists, which include extrapyramidal symptoms, dystonia, and drowsiness, make them more suitable for breakthrough nausea rather than for primary prophylaxis.

Benzodiazepines. These agents are anxiolytics that are used in patients receiving chemotherapy. Benzodiazepines are appropriate adjunct therapies to decrease treatment-related anxiety, and they are the preferred agents to treat and prevent anticipatory nausea and vomiting.49-51 Lorazepam and alprazolam are the primary agents used in this class, with sedation being the most common adverse effect, based on our clinical practice experience.

Olanzapine. This atypical antipsychotic has antagonist activity at adrenergic receptors, muscarinic receptors, and multiple dopamine (D1-4) and serotonin receptors (5-HT2A, 5-HT2C, 5-HT3, 5-HT6).52,53 Several trials have shown that olanzapine safely and effectively prevents acute, delayed, and refractory CINV when combined with other antiemetics in patients receiving moderately and highly emetogenic chemotherapy.54-56 Adverse effects such as sedation, weight gain, orthostatic hypotension, hyperglycemia, and a black box warning for increased mortality in elderly patients with dementia- related psychosis limit its use.57

Cannabinoids. Dronabinol and nabilone are 2 cannabinoids that are currently approved by the FDA for CINV in patients who have not adequately responded to conventional antiemetics. Cannabinoids are thought to prevent nausea and vomiting by antagonizing cannabinoid receptor CB1 in the CNS and possibly CB2 receptors as well.58 Cannabinoids have been shown to be as effective as or slightly more effective than dopamine receptor antagonists.59,60 Only 1 trial has directly compared a cannabinoid with standard treatment.61 Ondansetron with dexamethasone plus dronabinol was found to be equally efficacious to ondansetron, dexamethasone, and placebo.61 This lack of added benefit has limited the use of cannabinoids in the preventive setting. In addition, vertigo, euphoria, and somnolence are adverse effects that limit the use of cannabinoids.

Table 1
Recommended Antiemetic Regimens for CINV Prophylaxis.

Current Practice Guidelines

Practice guidelines from the NCCN and ASCO are available to help providers determine optimal prophylaxis and the treatment of CINV.10,11 The NCCN Antiemesis GuidelineTM, a consensus-based guideline that incorporates evidence and expert opinion to make recommendations, is revised annually.11 ASCO guidelines are purely evidence-based guidelines and are updated periodically; the last update was in 2011.10 Table 1 summarizes specific recommendations for antiemesis from the NCCN and from ASCO. For CINV, both guidelines outline primary prophylaxis based on the emetogenicity of the patient’s chemotherapy: high, moderate, low, and minimal.

For patients receiving highly emetogenic chemotherapy, both guidelines recommend a 3-drug combination that includes a 5-HT3 receptor antagonist, an NK1 receptor antagonist, and dexamethasone to prevent CINV. The NCCN specifies that the preferred 5-HT3 receptor antagonist for highly emetogenic chemotherapy is palonosetron,11 whereas ASCO does not list a preferred 5-HT3 receptor antagonist.

For patients receiving moderately emetogenic chemotherapy, the NCCN and ASCO recommend a 2-drug combination of a 5-HT3 receptor antagonist, preferably palonosetron, with dexamethasone. Dexamethasone is recommended by both organizations for the prevention of CINV in patients with low or minimal emetogenic potential. The NCCN also lists metoclopramide or prochlorperazine as possible alternatives. For patients receiving minimal-risk chemotherapy, no medications are recommended primarily as prophylaxis.

For anticipatory nausea and vomiting (ANV), ASCO and the NCCN recommend that prevention with optimal primary prophylaxis is the best approach.10,11 Both organizations state that behavioral therapy, including desensitization, is recommended for treatment of ANV. The NCCN guidelines recommend the use of benzodiazepines to treat ANV.

For radiation-induced nausea and vomiting, 5-HT3 receptor antagonists are the preferred class of antiemetic. The NCCN divides types of radiation into high risk (eg, total body irradiation), moderate risk (eg, radiation to upper abdomen), and combined radiation with chemotherapy.11 For moderate- and high-risk radiation, granisetron or ondansetron before each radiation treatment, with or without dexamethasone, is recommended. Prophylaxis of nausea and vomiting with combination chemotherapy and radiation is determined by the emetogenic potential of the chemotherapy.

ASCO categorizes emetogenic risk of radiation as high (eg, total body irradiation), moderate (eg, upper abdomen), low (eg, head and neck), minimal (eg, breast), and combination of radiation and chemotherapy.10 For moderate- and high-risk radiation, a 5-HT3 receptor antagonist before each radiation treatment, along with dexamethasone during fractions 1 to 5, are recommended. Granisetron and ondansetron are preferred 5-HT3 receptor antagonists in this setting, but dolasetron can be considered. Palonosetron is listed as an option, although there are no trials to indicate appropriate dosing frequency. Patients receiving radiation with a low risk for nausea and vomiting can be offered a 5-HT3 receptor antagonist or a dopamine receptor antagonist, such as metoclopramide or prochlorperazine, as a rescue treatment. Prophylaxis for nausea and vomiting for patients receiving a combination of chemotherapy and radiation is determined by the chemotherapy regimen, unless the radiation causes a higher risk.

Practical Considerations

Even with the current published guidelines, there are unique challenges for clinicians who manage patients with CINV or patients at risk of developing CINV. In this article, we focus on the following 3 practical challenges.

Table 2
Dosing Ranges for Antiemetics Used for Primary Prophylaxis of CINV.

Table 3
Pharmacokinetic Properties of 5-HT3 Receptor Antagonists.
  1. Are all 5-HT3 receptor antagonists created equal? Currently, there are four 5-HT3 antagonists available in the US market—dolasetron, granisetron, ondansetron, and palonosetron. Studies with these agents show relatively similar rates of success in the prevention of CINV in patients receiving cisplatin-based chemotherapy regimens. In addition, studies have established acceptable oral:IV conversions that result in similar levels of emesis control. Equivalent doses and pharmacokinetic properties of the agents are listed in Table 2 and Table 3. When used in equivalent doses, ondansetron, granisetron, and dolasetron are considered similar for the prevention of nausea and vomiting.62,63 The pharmacokinetics of ondansetron, granisetron, and dolasetron are slightly different, but not enough to result in any clinically significant differences.

    Palonosetron differs from the other 5-HT3 antagonists by having increased binding affinity to the 5-HT3 receptor, higher potency, and a longer half-life.64,65 The half-life of palonosetron is approximately 40 hours compared with the significantly lower half-lives of ondansetron, granisetron, and dolasetron.64 This results in altered dosing recommendations for palonosetron, which is dosed once per cycle rather than on a daily basis.

    As discussed earlier, the NCCN and ASCO guidelines have stated a preference for palonosetron for the prevention of CINV. These recommendations are based on data from 4 trials.66-69 In 3 of these trials, palonosetron was compared with various other 5-HT3 receptor antagonists to determine noninferiority.67-69 Only 1 trial was designed to detect superiority in the comparison.66 All 4 trials demonstrated similar success rates in preventing acute CINV between palonosetron and the comparator. The preferred status for palonosetron was derived from the data showing significant benefits for palonosetron in the delayed setting in 3 of the 4 trials, including the trial sized to measure superiority.

    All of these trials, however, had significant flaws in their design. Most notable, all of the trials compared a single dose of palonosetron to a single dose of the comparator 5-HT3 receptor antagonist. Given palonosetron’s extended half-life of 40 hours, compared with the halflives of between 3 and 8 hours for other 5-HT3 receptor antagonists, comparisons at any time after 24 hours are pharmacokinetically irrelevant. In addition, only 1 of the trials mandated the use of corticosteroids, which are the backbone of any combination antiemetic regimen.69 Given these significant flaws in design, we call into question the “preferred” status of palonosetron and instead endorse the idea that all 5-HT3 receptor antagonists are indeed equal if used at equivalent doses and schedules.

  2. Multiday chemotherapy. Most data on the use of 5-HT3 receptor antagonists, especially NK1 receptor antagonists, are in the setting of single-day chemotherapy. However, numerous malignancies are treated with multiple sequential days of chemotherapy, often with various agents being given on different days. Current guidelines recommend using the appropriate level of prophylaxis, according to the emetogenicity of the regimen, on each day of the regimen, and continuing delayed prophylaxis for 2 to 3 days after the completion of chemotherapy.10,11 In patients receiving moderately emetogenic regimens, this is a relatively straightforward approach. In patients receiving highly emetogenic regimens, however, it becomes more difficult.

    The timing of the NK1 receptor antagonist dose or of the frequency of palonosetron dosing in these regimens is poorly defined. Einhorn and colleagues evaluated the use of every 2-day palonosetron in patients receiving the highly emetogenic chemotherapeutic combination of bleomycin, etoposide, and cisplatin for testicular cancer and showed favorable results.70 Another study evaluated the use of aprepitant in combination with granisetron and dexamethasone, in patients receiving multiday highly emetogenic and moderately emetogenic chemotherapy. Aprepitant was administered as 125 mg, followed by 80 mg daily for the remainder of chemotherapy days, and continued for 2 more days, all along with dexamethasone. This study demonstrated a complete remission rate of almost 58% in highly emetogenic and 73% in moderately emetogenic regimens.71

  3. Breakthrough/refractory nausea and vomiting. Breakthrough/refractory nausea and vomiting are challenging to treat. In particular, refractory nausea and vomiting may cause significant morbidity, including weight loss, metabolic imbalances, and nutritional deficiency, and may result in the inability of patients to remain on their therapy schedule. The use of antidopaminergic and anticholinergic agents is very appropriate in this setting. More important, however, is the need to continually reassess the patient’s response to therapy with each cycle. In some cases, severe or refractory nausea could be predicted, given a patient’s history of poor tolerance of therapy, and adjustments could have been made to decrease the risk of nausea and vomiting. Also, regular reevaluation of risk factors can help to identify patients who may have an increased risk of breakthrough nausea and vomiting.

Proposal for a Value-Based Decision-Making Algorithm

It must be emphasized that the currently available guidelines are not meant to be clear-cut decisions on how to approach every patient. The guidelines are meant to be viewed as a starting point from which to build the case for every individual’s antiemetic regimen. Along with these guidelines, a “value judgment” must be made to determine the most optimal regimen for any patient.

Value, as it relates to CINV, may be determined based on a number of factors. The most relevant factors include (1) clinical factors (ie, freedom from nausea and decreased use of rescue medications), (2) logistic factors (ie, convenience of a regimen and likelihood of adherence), (3) safety factors (ie, consideration of potential adverse effects of agents in particular scenarios), and (4) cost factors (ie, affordability, coverage, and reimbursement). In many cases, treatment decisions must be made considering whether the patient will be able to afford or comply with the regimen that would technically be “ideal.” For example, clinicians may consider using IV NK1 receptor antagonists and/or IV palonosetron in a patient who either cannot afford to pay for continued oral NK1 receptor antagonist or 5-HT3 receptor antagonist therapy, or in a patient who will be unlikely to remember to take doses as scheduled for the days after chemotherapy.

Figure
Proposed Value-Based Decision Algorithm for CINV.

A proposed algorithm for decision-making, including considerations regarding the abovementioned value considerations, is outlined in the Figure.

Conclusions

Antiemetic regimens for a particular patient must be evaluated and then reevaluated at every treatment cycle. At every step of a patient’s care, clinicians must incorporate clinical decision-making with value-based considerations to determine each patient’s individual, most optimal approach to treatment. With such an approach, we hope to continue to make progress in the prevention and management of this troublesome and problematic adverse effect of chemotherapy, thereby helping to improve the therapy experience and quality of life for our patients.

Author Disclosure Statement

Dr Rao and Dr Faso have reported no conflicts of interest.

Dr Rao is an oncology/BMT clinical pharmacist practitioner and Dr Faso is a hematology/oncology clinical pharmacist practitioner, University of North Carolina Hospitals and Clinics, Chapel Hill, NC.

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Stakeholder Perspective
Selecting Best Therapies for Control of Chemotherapy-Induced Nausea and Vomiting

PROVIDERS/PAYERS: In a world of guidelines, algorithms, and literature searches, we often forget to focus on the patient. Nausea and vomiting are side effects that need to be evaluated differently from other effects related to chemotherapy in patients with cancer. Thoughtful evaluation to determine the pathophysiologic mechanisms that trigger nausea, as described in the article by Dr Rao and Dr Faso, is key to selecting the optimal antinausea medications.1 When evaluating chemotherapy-induced nausea and vomiting (CINV), we automatically think of serotonin in peripheral receptors and dopamine in the chemo - receptor trigger zone as the primary culprits; however, we must also consider any underlying causes that may be contributing factors.

Direct interaction with and discussion of patients’ past experiences with nausea, their perception of nausea, and their day-to-day lives affect the choice of antiemetics for patients with cancer. Neurologic or vision changes secondary to chemotherapy may contribute to vestibular changes, indicating a need for anticholinergics or antihistamines. Taste and smell changes secondary to chemotherapy may require benzodiazepines or corticosteroids to help control nausea. The main point is that the patient must be evaluated beyond just the emetogenic potential of the chemotherapy itself. As the authors pointed out, clinical success is the first step in the value-based decision algorithm.

Comorbid conditions also affect the success of these agents, and it is sometimes important to consider side effects as intended benefits of some of these drugs. Steroids may cause agitation or weight gain, but some patients experience this as increased energy or mood boosts, which can be a dual benefit beyond the antinausea component. Sedation is a common side effect with benzodiazepines, but patients with insomnia (especially secondary to their corticosteroid use) may realize dual benefit here as well. The key factors for these patients are convenience and safety.

A final consideration for healthcare providers is the question of reimbursement, when the choice “does not fit with the guidelines.” The fact is that guidelines are great in some cases, but value-based considerations are essential to optimizing therapy in our patients. Without consideration of the whole person, the potential increased risk factors for CINV, and other comorbid conditions, payers may approve reimbursement for whatever standard guidelines recommend, but this will not necessarily be getting the best treatment for our patients. As providers, we have to make sure that we drive the decision for antiemetic therapy based on patient-specific factors in addition to the chemotherapy itself.

PATIENTS: Nausea and vomiting remain the side effects of chemotherapy that patients with cancer fear the most. Almost every patient has known someone or had a family member who has “suffered” through chemotherapy and has had horrendous issues with CINV. Patients report that they would rather be in pain than have CINV, because many can work through the pain, but nausea is completely debilitating. The best option is empowering patients to take control of their nausea through proper education, use of antiemetics that are appropriate to their case, and through continual follow-up and adjustment to their anti emetic regimens. Patients need to be given the opportunity to sit down with a nurse or a pharmacist to reiterate the counseling provided by their physicians. Our experience with this process has helped to improve monitoring and follow-up for patients with CINV.

We must not only give patients the antiemetics they need, but we must also provide them with the resources to be properly educated about these medications. Therefore, to incorporate value-based considerations for optimal therapy, it is necessary to ensure that a cohesive multidisciplinary approach is provided to the patient.

 

Robert Mancini, PharmD
Oncology Pharmacist
St. Luke’s Mountain States Tumor Institute
Boise, ID
 
  1. Wood GJ, Shega JW, Lynch B, Von Roenn JH. Management of intractable nausea and vomiting in patients at the end of life. JAMA. 2007;298:1196-1207.
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Last modified: August 30, 2021