optimal management of chemotherapy-induced nausea and ... cinv.pdf · –no/minimal prior history...
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Udomsak Bunworasate Chulalongkorn University
Optimal Management of
Chemotherapy-induced
Nausea and Vomiting (CINV)
Scope of the Problem
Classification of CINV • Acute
– Occurring within the first 24 hrs. after initiation of chemo; generally peaks after 5 to 6 hrs.
• Delayed – Occurring from 24 hrs. to several days (days 2 to 5) after chemo
(commonly seen with cisplatin, carboplatin, cyclophosphamide, ifosfamide, doxorubicin)
• Anticipatory – Occurring before a treatment as a conditioned response to the
occurrence of CINV in previous cycles
• Breakthrough – Occurring despite appropriate prophylactic treatment
• Refractory – Recurring in subsequent cycles of therapy,
excluding anticipatory CINV
R.M.Navari, M Aapro. NEJM 2016
Patterns of CINV
Martin M. Oncology. 1996;53(suppl 1): 26–31.
0 1 2 3 4 5
Days
Cisplatin
Cyclophosphamide/Carboplatin
Inte
nsit
y o
f em
esis
34
17 24
15
35
13
52
28
0
20
40
60
80
100
Acute
Nausea
Acute
Vomiting
Delayed
Nausea
Delayed
Vomiting
Per
cen
t o
f P
atie
nts
MD/RN prediction
Patient experience
Physicians and nurses from 14 oncology practices in 6 countries
Patients: 75% women; 78% Mod emetic chemo; 50% breast cancer; 18% lung cancer
Grunberg et al. (2004). Cancer, 100, 261-268.
PERCEPTIONS versus EVIDENCE - Underestimation of Emesis with Chemotherapy -
CINV prevention from the start • Uncontrolled CINV in the previous cycle is the key factor for
CINV in the subsequent cycle, increasing the likelihood of CINV by 6.5 times in Cycle 2 and 14 times in Cycle 3.
• Patients at high risk of CINV need effective prevention from the start.
Molassiotis A, et al. J Pain Symptom Manage. 2016 Feb 16.
Risk Factors of CINV
• Patient-related risk factors:1
– Younger age (<60 years)
– Female gender
– No/minimal prior history of alcohol and tobacco use
– Susceptibility to motion sickness
– Prior CINV*
– Anxiety
• Treatment-related risk factors:1,2
– Moderate-to-high emetogenicity of chemotherapy agents or regimens
– Use of moderate-to-high drug dose and multiple agents
1. Gregory RE, et al. Drugs. 1998;55:173–189. 2. Hesketh PJ, et al. J Clin Oncol. 1997;15:103–109.
Physiology of CINV
Grunberg SM, et al. N Engl J Med.1993;329:1790–1796.
• Adapted from: Navari RM. Drugs. 2013;73:249–262. • Frame DG. J Support Oncol. 2010 Mar-Apr;8(2 Suppl 1):5-9. • Lorusso V et al. Future Oncol. 2014 Oct 31:1-13. DA: dopamine; GABA: gamma-aminobutyric acid; NK1: neurokinin-1 RAs: receptor antagonists; 5-HT3:
5-hydroxytryptamine3.
Neurotransmitters involved in the Emetic Reflex
Emetic Reflex
Histamine
Endorphins
Acetylcholine Dopamine
Substance P
GABA
Cannabinoids
Serotonin
NK1 RAs 5-HT3 RAs
DA RAs
Antiemetics Available for CINV • Most commonly used classes of antiemetics
– 5-HT3 Receptor Antagonists (ondansetron, dolasetron, granisetron, palonosetron)
• Inhibit serotonin, 5-HT3, mediated activation of the vagal afferent fibres in the stomach and the central CTZ and vomiting centres through the 5-HT3 receptor
– Corticosteroids (dexamethasone)
• Unknown mechanism but increase the 5-HT3 RA antiemetic efficacy
– NK1 Receptor Antagonists (aprepitant, fosaprepitant)
• Inhibition of the substance P-mediated activation of the vomiting centre
– Other agents
Other Neurotransmitters, Receptors, and Drugs
Antiemetic Risk Groups
Antiemetic Risk
Groups
Percentage of Patients (%)
High 90% or more of patients experience acute emesis
Moderate 30% to 90% of patients experience acute emesis
Low 10% to 30% of patients experience acute emesis
Minimal < 10% of patients experience acute emesis
Specific antiemetic regimen recommended for each antiemetic risk group
Aapro M, Gralla RJ, Herrstedt J, et al. MASCC/ESMO antiemetic guideline 2016. Multinational Association of Supportive Care in Cancer. 2016. Available at http://www.mascc.org/assets/Guidelines-Tools/mascc_antiemetic_guidelines_english_2016_v.1.2.pdf. Accessed on April 6, 2016.
Emetic Risk Categories (examples) • High
– Cyclophosphamide/doxorubicin combination – Cisplatin, carboplatin AUC ≥ 4 – Dacarbazine – High doses chemotherapy agents (HDCy, HDIfos, Transplant)
• Moderate – IV Alkylaing agents – Anthracyclines (< 60 mg/m2) – Azacitidine, bendamustine – ARA-C > 200 mg/m2, MTX ≥ 250 mg/m2
• Low – Antimetabolites
• Minimal – Monoclonal antibodies, vinca alkaloids, bortezomib, -nibs
Grunberg SM, et al. Support Care Cancer. 2011;19 (Suppl 1):S43-7.
Prophylaxis for CINV: General Principles
• Acute – Typically administered IV in the infusion center
• Delayed – Some IV drugs will cover delayed (eg. Palonosetron) – May receive prescription to take as scheduled
• Breakthrough – Should always receive a prescription that is PRN – Use a different MOA than for prophylaxis
• Anticipatory – Lorazepam if fearful or poor control after previous
cycle
Grunberg SM, et al. Support Care Cancer. 2011;19 (Suppl 1):S43-7.
Emetic risk groups Antiemetics
High (non-AC)
High: anthracycline +
cyclophosphamide (AC)a
Carboplatinb
Moderatec
Low
Overview of NCCN / ASCO / MASCC-ESMO guidelines for Acute nausea and vomiting
* The addition of OLA is recommended in HEC by ASCO, is one possible option in HEC and MEC by NCCN and only when nausea is an issue by MASCC/ESMO a If an NK1 RA is not available for AC chemotherapy, palonosetron is the preferred 5-HT3 RA for MASCC/ESMO. b Carboplatin is considered as “high-MEC” by ASCO (here only AUC > 4) and MASCC/ESMO, and reclassified as HEC by NCCN (when AUC >4): an NK1 RA
should be added in all cases. c An NK1 RA is recommended as option in MEC for selected patients with additional risk factors or who have failed previous therapy with 5-HT3 antagonist plus
steroid by NCCN. d Palonosetron and granisetron extended-release injection formulation are the preferred 5-HT3 RAs in MEC regimens without an NK1 RA by NCCN. e Not for ASCO.
5-HT3 RA =
serotonin receptor
antagonist
DEX =
dexamethasone
NK1 RA= neurokinin 1
receptor antagonist
PALO =
palonosetron
DRA =
dopamine receptor
antagonist
5-HT3 RA DEX NK1 RA
5-HT3 RA DEX NK1 RA
DEX
DEX 5-HT3 RA DRAe
+ +
OR
+
+
OR
+
+
+ OLA*
OLA*
5-HT3 RA DEX NK1 RA + +
OLA =
Olanzapina
5-HT3 RAd
1. Roila F. et al. Ann Oncol. 2016 Sep;27(suppl 5):v119-v133. MASCC/ESMO Antiemetic Guideline 2016 V.1.2. Available at: http://www.mascc.org/; 2. NCCN: National Comprehensive Cancer Network; NCCN Clinical Practice Guidelines in Oncology; Version 2.2018. Available at: www.nccn.org ; 3. Hesketh P. J. et al. J Clin Oncol. 2017 Oct 1;35(28):3240-3261. doi: 10.1200/JCO.2017.74.4789. Epub 2017 Jul 31.
Overview of NCCN / ASCO / MASCC-ESMO guidelines for Delayed nausea and vomiting
Emetic risk groups Antiemetics
High (non-AC)
High: anthracycline +
cyclophosphamide (AC)
Carboplatinb
Moderatec
Low -
DEX
DEX**
+ OLA*
+ OLA*
a NK1 RA (aprepitant 80 mg) only if aprepitant 125 mg was used on Day 1. Other NK1 RAs, netupitant, rolapitant, aprepitant 165 mg or fosaprepitant 150 mg do not
need repeat doses.
* The addition of OLA is recommended in HEC by ASCO, is one possible option in HEC and MEC by NCCN and only when nausea is an issue by MASCC/ESMO.
** DEX is recommended in AC by NCCN and, If APR on D1, APR or DEX by MASCC/ESMO. b Carboplatin: DEX is recommended only by NCCN over AUC >4
c Only for regimens with known delayed CINV potential by MASCC/ESMO and ASCO.
NK1 RAa
NK1 RAa +
NK1 RAa +
OLA ?* +
DEX
1. Roila F. et al. Ann Oncol. 2016 Sep;27(suppl 5):v119-v133. MASCC/ESMO Antiemetic Guideline 2016 V.1.2. Available at: http://www.mascc.org/; 2. NCCN: National Comprehensive Cancer Network; NCCN Clinical Practice Guidelines in Oncology; Version 1.2018. Available at: www.nccn.org ; 3. Hesketh P. J. et al. J Clin Oncol. 2017 Oct 1;35(28):3240-3261. doi: 10.1200/JCO.2017.74.4789. Epub 2017 Jul 31.
Guideline Recommendations: Low and Minimal
Guideline Recommendations: Moderate Emetogenicity, Acute
Yes Yes
Guideline Recommendations: Moderate Emetogenicity, Delayed
No No 5HT3 RA
Guideline Recommendations: High Emetogenicity, Acute
Add Olanzapine
Guideline Recommendations: High Emetogenicity, Delayed
Add Olanzapine
+/-
Breakthrough CINV
NCCN ver.2, 2017
5-HT3: 5-hydroxytryptamine 3; RA: receptor antagonist; PALO: palonosetron; PK: pharmacokinetics 1. Rojas C et Slusher BS. Eur J Pharmacol. 2012 Jun 5;684(1-3):1-7. 2. Wong EHF et al. Br J Pharmacol. 1995;114:851-859.
[(3aS)-2-[(S)-1-azabicyclo[2.2.2]oct-3-yl]-2,3,3a,4,5,6-
hexahydro-1-oxo-1H-benzo[de]isoquinoline-hydrochloride]2
N H
O
O C H 3 N
N C H 3
N
N H
O C H 3 N
N C H 3
O
N N
N H
O
O N
O N H
H O N H 2
Ondansetron
Tropisetron Granisetron
Dolasetron
N
O
H
N PALO
Chemical structures of serotonin and 5-HT3 RAs: Most 5-HT3 RAs are based on a 3-substituted indole structure that resembles serotonin, PALO's structure has
a tricyclic ring system attached to a quinuclidine moiety 1
Serotonin
Antiemetics Available for CINV Prevention Palonosetron and other 5-HT3 RAs: Chemical Structure
The 5-HT3 RA can displace serotonin-inhibiting signal transduction
Cell membrane
Competitive binding
Rojas C et Slusher BS. Eur J Pharmacol. 2012 Jun 5;684(1-3):1-7.
PALO: Palonosetron; 5-HT3: 5-hydroxytryptamine 3; RA: receptor antagonist.
5-HT3 receptor serotonin 5-HT3 RAs Signal transduction
5-HT3 RA administration
5-HT3 RA and Serotonin Receptor Binding Characteristics Competitive binding
Serotonin can displace the 5-HT3 RA and reactivate signal transduction
Cell membrane
Rojas C et Slusher BS. Eur J Pharmacol. 2012 Jun 5;684(1-3):1-7.
PALO: Palonosetron; 5-HT3: 5-hydroxytryptamine 3; RA: receptor antagonist.
5-HT3 receptor serotonin Signal transduction
Competitive binding
Serotonin and the 5-HT3 RA compete for the same binding site.
5-HT3 RAs
5-HT3 RA and Serotonin Receptor Binding Characteristics Competitive binding
PALO binding to the allosteric site causes a conformational change that increases the affinity for
a second molecule of PALO to bind
Cell membrane
Rojas C et Slusher BS. Eur J Pharmacol. 2012 Jun 5;684(1-3):1-7.
PALO: Palonosetron; 5-HT3: 5-hydroxytryptamine 3.
Allosteric binding and positive cooperativity
PALO can displace serotonin and has a stronger binding affinity compared to other
setrons such as ondansetron and granisetron
5-HT3 receptor serotonin Signal transduction PALO
PALO and Serotonin Receptor Binding Characteristics Allosteric binding and positive cooperativity
Rojas C et Slusher BS. Eur J Pharmacol. 2012 Jun 5;684(1-3):1-7.
+ PALO + Granisetron + Ondansetron
5-HT3 receptor is still on the cell membrane after ondansetron and granisetron treatment
(orange/yellow zones)
5-HT3 receptor is no longer present on the cell membrane after PALO treatment
(no or limited orange/yellow zones)
Evidence of 5-HT3 Receptor Internalization:
Confocal fluorescence microscopy of cells after treatment with 5-HT3 RAs
Rojas C et al. Eur J Pharmacol. 2010 Jan 25;626(2-3):193-9. PALO: Palonosetron; 5-HT3: 5-hydroxytryptamine 3; RA: receptor antagonist.
PALO Impact on 5-HT3 Receptor Function 5-HT3 Receptor Internalization
HEK-293 cells transfected with fluorescent 5-HT3 receptor (GREEN)
Cell membrane counterstained with wheat germ agglutinin, Alexa Fluor 594 (RED)
Receptor overlapping on the cell membrane (ORANGE / YELLOW)
All 5-HT3 RAs structures resemble serotonin...
Parameter Palonosetron Ondansetron Granisetron
Half Life (hrs)1 40 4 9
Binding Affinity1 10.45 8.39 8.91
Positive Cooperativity2 YES NO NO
Inhibition of Receptor Function2 Long Lasting Short Lasting Short Lasting
Receptor Internalization3 YES NO NO
Inhibition of 5-HT3/NK1 receptor cross-talk4 YES NO NO
... except palonosetron
5HT3 RAs
N H
H O N H 2
S e r o t o n i n
N
O
H
N
1. Constenla, M., 2004 Ann Pharmacother . 38, 1683-1691. 2. Wong E.H. et al. Br J Pharmacol. 1995;114:851-859. 3.Rojas C et al. Anesth Analg.
2008 Aug;107(2):469-78. 4. Rojas C et al. Eur J Pharmacol. 2010 Jan 25;626(2-3):193-9. 5. Rojas C et al. J Pharmacol Exp Ther. 2010
Nov;335(2):362-8. 6.Saito M et al. Lancet Oncol. 2009 Feb;10(2):115-24. 7.Janelsins MC et al. Expert Opin Pharmacother. 2013 April ; 14(6): 757–
766.
Annals of Oncology 14: 1570–1577, 2003
Palonosetron vs Ondansetron Moderately emetogenic chemotherapy
• Multicenter, phase III, randomized, controlled, double-blind, non-inferiority study
• Primary Endpoints : % patients achieving CR in acute phase
• Schedule to receive moderately emetogenic chemotherapy (MEC)
• The most common cancer type was breast cancer (57% of patients)
• The most common chemotherapeutic agents administered on day 1 (received by
>10% of patients) were Cyclophosphamide (63%) and Doxorubicin (48%)
Chemotherapy Dose
Carboplatin, Epirubicin, Idarubicin,
Ifosfamide, Irinotecan or Mitoxantrone
Any dose
Methotrexate >250 mg/m2
Cyclophosphamide <1500 mg/m2
Doxorubicin >25 mg/m2
Cisplatin <50 mg/m2 (infused over 1–4 h)
Palonosetron vs Ondansetron Moderately emetogenic chemotherapy
Gralla R, et al. Ann Oncol. 2003;14:1570–1577 .
Complete Response
81* 74.1*
69.3* 68.6
55.1 50.3
0
20
40
60
80
100
Acute: 0–24 (Day 1)
Delayed: 24–120 (Days 2–5)
Overall: 0–120 (Days 1–5)
Co
mp
lete
Resp
on
se
(N
o E
mesis
, N
o R
esc
ue)
(% o
f P
ati
en
ts)
Time (h)
Palonosetron 0.25 mg I.V. (n=189)
Ondansetron 32 mg I.V. (n=185)
*p<0.025 (Fisher’s exact test)
Palonosetron vs Ondansetron Moderately emetogenic chemotherapy
Gralla R, et al. Ann Oncol. 2003;14:1570–1577 .
• 72% female; mean age 56 years; 41% chemotherapy-naïve
• Majority receiving cyclophosphamide and/or doxorubicin combination MEC for breast cancer
• No concomitant dexamethasone pretreatment
Support Care Cancer (2009) 17:205–209
Day 1 Days 1-5 Breakthrough treatment
after 72/120 hours
Treatment
A
Palo 0.25 + Dex 8 mg iv
Dex 8 mg (4 mg BID) iv
Palo 0.25 mg
Treatment
B
Ond 8 mg iv + Dex 8 mg iv
Dex 8 mg (4 mg BID) iv
Metoclopramide
(20 mg iv every 6 or 12 h)
• Single centre, prospective, observational study
• 46 patients undergoing multiple-day CT for hematologic malignancies were
treated with palonosetron and retrospectively compared with patients treated
with ondansetron
Treatment scheme:
Study Design
Note: Palonosetron should be used only before chemotherapy administration. Palonosetron should not be used to prevent
nausea and vomiting in the days following chemotherapy if not associated with another chemotherapy administration
Palonosetron in Haematological Malignancies
Characteristic Palonosetron (n=46) Ondansetron (n=45)
Median age, years (range) 51 (15-80) 50 (20-77)
Gender, male/female (number) 29/17 27/18
Haematological malignancy (%)
Non-Hodgkin lymphoma 50 48
Hodgkin disease 18 24
Acute myeloid leukemia 30 28
Solid tumor 2 0
Chemotherapy regimen (%) (number of cycles)
DHAP 24 (22) 24 (24)
Hyper-CVAD 9 (16) 7 (12)
FluCy 17 (52) 13 (48)
HD-Mtx-AraC 4 (6) 2 (4)
BEACOPP 9 (28) 9 (36)
IGEV 9 (18) 11 (24)
ICE 22 (18) 18 (16)
FLANG 6 (6) 2 (4)
HD-AraC 17 (7) 18 (5)
Other 2 (7) 0
Total number of cycles 180 173
Patient Characteristics
Palonosetron in Haematological Malignancies
Overall Incidence of CINV
Musso M, et al. Support Care Cancer 2009;17:205-9
80
60
0
10
20
30
40
50
60
70
80
90
100
Palonosetron Ondansetron
CINV 3
CINV 2
CINV 1
CINV 0
*
p<0.05
% o
f P
atients
Palonosetron in Haematological Malignancies
No C
INV
(%
of P
atients
)
Efficacy of Rescue Therapy
Musso M, et al. Support Care Cancer 2009;17:205-9
Note: Palonosetron should be used only before chemotherapy administration. Palonosetron should not be used to prevent
nausea and vomiting in the days following chemotherapy if not associated with another chemotherapy administration
67
22
0
10
20
30
40
50
60
70
80
Second dose of Palonosetron Multiple dose Metoclopramide
*
p=0.039
Palonosetron in Haematological Malignancies
• The most common adverse events were headache (17.1%) and constipation
(9.8%)
• No changes in electrocardiogram intervals or cardiac rhythm were seen after
either single or multiple administrations of Palonosetron
Tolerability
Musso M, et al. Support Care Cancer 2009;17:205-9
• This trial demonstrates the clinically relevant efficacy of Palonosetron in the
control of CINV in multi-day chemo and in rescuing patients experiencing
breakthrough emesis
Conclusion
Palonosetron in Haematological Malignancies
5-HT3 RAs : systematic review and meta-analysis
Support Care Cancer (2014) 22:1685-1697
44
• Odds ratios demonstrated statistical superiority of Palonosetron in complete
response of acute phase.
Efficacy – CR in acute phase
Popovic, M et. al. Support Care Cancer (2014) 22:1685–1697
5-HT3 RAs : systematic review and meta-analysis
45
Efficacy – CR in delayed phase
• Odds ratios demonstrated statistical superiority of Palonosetron in complete
response in delayed phase.
Popovic, M et. al. Support Care Cancer (2014) 22:1685–1697
5-HT3 RAs : systematic review and meta-analysis
• Superior efficacy (especially in the delayed phase where CINV
control is more difficult).
• Similar safety profile.
• Not associated to a significant increase of QTc.
• Possibility to reduce dexamethasone dose without impacting
significantly on the antiemetic regimen efficacy.
• Possibility to reduce polypharmacy also in multiple day
chemotherapy.
• Associated with a lower impact on chemotherapy compliance
• Preferred 5-HT3 RA in the NCCN guideline.
Palonosetron vs 1st Generation 5-HT3 RAs
1. Gralla R, et al. Ann Oncol. 2003;14:1570-1577
2. Morganroth J, et al. Support Care Cancer. 2015 Jun 26
3. Gonullu G, et al. Support Care Cancer. 2012;20(7):1435-1439.
4. Yavas et al. Support Care Cancer. 2012; 20(10):2343-7.
5. Dogan U, et al. Eur Rev Med Pharmacol Sci. 2012;16(4):462-468.
6. Antiemesis. Version1. National comprehensive cancer network. 2017.
7. Hesketh PJ, Bohlke K, Lyman GH, et al. Antiemetics: American society of clinical oncology focused guideline update. J Clin Oncol. 2016;34(4):381-6.
8. MASCC/ESMO antiemetic guideline 2016.
NEPA: Combination of NK1 and 5-HT3 RAs
• Selective neurokinin type 1 receptor antagonist (NK1 RA)1
• Competitively binds to and blocks activity of human substance P receptors1
• High binding affinity, long half-life (90 h)1, 2
• High (>90%), long-lasting (>96 h) brain receptor saturation after single oral dose1
• Moderate inhibitor of CYP3A43
1. Spinelli et al. J Clin Pharmacol. 2014;54(1):97-108;
2. Data on file;
3. Lanzarotti et al. Supp Care Cancer. 2013;21(10):2783-2791;
4. Rojas et al. J Pharmacol Exp Ther. 2010;335(2):362-368;
5. Basch et al. J Clin Oncol. 2011;29:4189-4198.
Oral Netupitant
• Higher binding affinity and longer half-life than other 5-HT3 RAs4
• Exhibits distinctly different receptor binding (allosteric binding, positive cooperativity)4
• Results in long-lasting inhibition of 5-HT3 receptor function4
• Inhibits cross-talk between the 5-HT3 and NK1 receptor pathways4
• Antiemetic guideline-recommended “preferred” 5-HT3 RA5
Oral Palonosetron
NEPA Phase III study: multi cycles
• Phase III study1: multinational, double-blind, randomized, parallel groups • Non-AC MEC or HEC over multiple cycles • No pre-specified limit to the number of consecutive chemotherapy cycles
NEPA, PALO, APR, and DEX were all orally administered On Day 1, NEPA, PALO and APR were taken 60 minutes, and DEX 30 minutes, prior to chemotherapy
Group Day 1 Days 2 and 3
NEPA (N = 309)
APR + PALO
(N = 104)
Day 4
NEPA + DEX 12 mg (HEC & MEC)
HEC: DEX 8 mg MEC: none
HEC: DEX 8 mg MEC: none
APR 125 mg + oral PALO 0.50 mg + DEX 12 mg
(HEC & MEC)
HEC: APR 80 mg + DEX 8 mg
MEC: APR 80 mg
HEC: DEX 8 mg MEC: none
Randomize 3:1
76%/24% MEC/HEC
N = 413
AC: anthracycline-cyclophosphamide; APR: aprepitant; DEX: dexamethasone; HEC: highly emetogenic chemotherapy; MEC: moderately emetogenic chemotherapy; NEPA: oral fixed combination of netupitant (300 mg) and palonosetron (0.50 mg); PALO: palonosetron 1. Gralla RJ, et al. Ann Oncol 2014;25:1333–9. 2. Jordan K, et al. Support Care Cancer (2016) 24:4617–4625
Carboplatin subset: CR rates (0-120 hrs)
80.0
90.6 92.2 93.4
82.4 87.5 87.5 90
0
10
20
30
40
50
60
70
80
90
100
Cycle 1 Cycle 2 Cycle 3 Cycle 4
Pat
ien
ts (
%)
NEPA + DEX
APR + PALO + DEX
128 145 106 116 NEPA + DEX: N = 48 51 40 48 APR + PALO + DEX: N =
APR: aprepitant; CR: complete response (no emesis, no rescue medication); DEX: dexamethasone; NEPA: oral fixed combination of netupitant (300 mg) + palonosetron (0.50 mg); PALO: palonosetron
Overall (0-120hrs) CR rates with NEPA were high and maintained across 4 cycles of chemotherapy
Jordan K, et al. Support Care Cancer (2016) 24:4617–4625
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