Use of Curcumine with Tyrosine Kinase Inhibitors in EGFR-mutant Non-Small Cell Lung Cancer

Esfahani K, et al., J Altern Complement Integr Med 2021, 7: 201 DOI: 10.24966/ACIM-7562/100201

HSOA Journal of Alternative, Complementary & Integrative Medicine Research Article

Use of Curcumine with Tyrosine Kinase Inhibitors in EGFR-mutant Non-Small Cell Lung Cancer. A Phase I prospective Cohort Trial

Kashayar Esfahani1, Goulnar Kasymjanova2*, Arif Awan3, Carmela Pepe2, Jason S Agulnik2, Lama Sakr2, David Small2, Boodaghians Levon4 and Victor Cohen1 Department of Medical Oncology, Jewish General Hospital, Montreal, Canada

1

Jewish General Hospital, Peter Brojde Lung Cancer Centre, Montreal, Canada

2

3

Department of Medical Oncology, The Ottawa Hospital, Ottawa, Canada

4

Internal Medicine Residency Program, McGill University, Montreal, Canada

Abstract Introduction: Curcumin has been shown to modulate many of the known pathways causing resistance to Epidermal Growth Factor Receptor Tyrosine Kinase Inhibitors (EGFR-TKIs) in pre-clinical studies.

Methods: This is a phase 1 open prospective cohort study focused on feasibility and safety of combination of enhanced bioavailable formulation of curcumin (CURCUViva TM at 80 mg/ 1 capsule per day for 60 days) in conjunction with an EGFR-TKI in patients with metastatic NSCLC. Results: 55 patients were approached, 14 (25%) declined to participate in the study: 8 were living far from the hospital and 6 had low interest in curcumin. Of the 41/55 (75%) patients willing to participate, 20 were enrolled; the remaining 21 were already taking another supplement. One excluded before commencing curcumin due to abnormal liver enzymes. 16/19 (84%) completed intended treatment and 86% of them adhered to prescribed treatment. Adverse events profiles were mild, pre-existing and related to TKIs. The CRP level *Corresponding author: Goulnar Kasymjanova, Jewish General Hospital, Peter Brojde Lung Cancer Centre, Montreal, Canada, Tel: +1 514340-82222, Ext: 24312; E-mail: gkasymja@jgh.mcgill.ca Citation: Esfahani K, Kasymjanova G, Awan A, Pepe C, Agulnik JS, et al. (2021) Use of Curcumine with Tyrosine Kinase Inhibitors in EGFR-mutant Non-Small Cell Lung Cancer. A Phase I prospective Cohort Trial. J Altern Complement Integr Med 7: 201.

Received: October 25, 2021; Accepted: October 26, 2021; Published: November 02, 2021 Copyright: © 2021 Esfahani K, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.

reduced significantly (p<0.05) during the treatment from 15.5 g/L at baseline to 7.38 at week 2, and increased shortly after discontinuation of curcumin. There was significant improvement in lung cancer symptoms (FACT-LCS; p=0.006) and Trial Outcome Index (FACTTOI; p=0.011) as well as in the Emotional Well-Being subscale.

Conclusion: Our study is the first prospective clinical study using combination of curcumin and EGFR-TKIs in metastatic lung cancer patients. The future randomized larger-scale clinical trials using this combination is feasible and safe. RCT will seek to assess the potential effects on survival and response to TKIs. Keywords: Curcumin; EGFR mutations; Lung cancer; Safety; TKI

Introduction Lung cancer is the leading cause of cancer mortality among both men and women in North America. In 2019 alone, there was an estimated 228,150 new cases of lung cancer in the United States, accounting for 142,670 deaths nation-wide [1]. Approximately 80-85% of lung cancers are classified as Non-Small-Cell Lung Cancer (NSCLC), with histological subcategories including adenocarcinoma, squamous cell carcinoma and large cell carcinoma. Approximately 75% of patients with NSCLC present with advanced disease at the time of diagnosis [2], with an estimated overall survival rate of 70% at 12 months [3]. For those patients whose advanced NSCLC harbors an Epidermal Growth Factor Receptor (EGFR) mutation (10% in the United States), Targeted therapy with Tyrosine Kinase Inhibitors (EGFR-TKIs) is considered the standard of care, conferring as much as two- to four-fold greater progression-free survival and increased quality of life compared to cytotoxic chemotherapy [4-8].

Many patients with lung cancer also opt to use natural products concurrently with conventional treatment. One such example is curcumin, or diferuloylmethane, derived from the plant turmeric and commonly consumed throughout the world as the main ingredient in the popular spice known as curry. Curcumin’s anti-inflammatory and anticancer properties have repeatedly been demonstrated both in vitro and in animal models [9-11], including its ability to slow the progression of lung cancer cell lines [12,13]. Though the exact mechanisms through which it modulates gene expression have not yet been fully elucidated, its primary target is thought to be Nuclear Factor Kappa B (NF-κB) [14-16], an upstream signaling molecule linked to lung cancer oncogenes is and cell proliferation [17-19]. Recent in vitro data suggest that curcumin also holds the potential to modulate many of the known resistance pathways to EGFR-TKIs by dose-dependently suppressing EGFR expression [20-22], reducing transactivation of the MET oncogene [23], and reducing inflammation in the tumor microenvironment through selective inhibition of TGF-β [24], TNF-α and NFκB [25]. Synergistic action with gefitinib has also been observed in EGFR-TKI resistant cell lines in mice model of NSCLC [26].

Curcumin’s safety profile is supported by a growing body of evidence [27-29], particularly among cancer populations, in which its potential role as an adjuvant therapy to conventional chemotherapeutic agents is increasingly studied [30-33]. However, despite these

Citation: Esfahani K, Kasymjanova G, Awan A, Pepe C, Agulnik JS, et al. (2021) Use of Curcumine with Tyrosine Kinase Inhibitors in EGFR-mutant Non-Small Cell Lung Cancer. A Phase I prospective Cohort Trial. J Altern Complement Integr Med 7: 201.

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promising findings, no studies have yet assessed the safety or efficacy of using curcumin in a lung cancer population in combination with EGFR-TKIs. In addition, curcumin has shown low solubility, poor absorption and rapid breakdown within the body (with prominent first-pass metabolism), resulting in poor oral bioavailability and minimal therapeutic effect. This has led to the development of multiple approaches to increase serum and tissue concentrations, including the use of adjuvant molecules, liposomal particles, phospholipid complexes, curcumin nanoparticles and structural changes [34-36].

The purpose of the current study is to determine the feasibility, and safety of using an enhanced oral bioavailable formulation of curcumin alongside an EGFR-TKI in patients with advanced NSCLC, in addition to assessing its anti-inflammatory properties and impact on health-related quality of life.

Patient eligibility Inclusion criteria for the study were: • Recent diagnosis or ongoing treatment for histologically-confirmed advanced EGFR-mutant NSCLC, defined as unrespectable stage 3A, 3B or 4 • EGFR mutation analysis performed using the Roche COBAS EGFR v2 qPCR test, with documentation of any positive results, prior to enrollment into the trial • At least one month of EGFR-TKI therapy prior to starting curcumin • ECOG performance Score 0-3 • ≥18 years of age

Exclusion criteria included:

Materials and Methods

• Symptomatic brain metastases

Study drug

• Other concurrent investigational agents

• Other non-vitamin or mineral natural health products (including Chinese herbs)

For the purposes of this study, we used CURCUVivaTM lipid-en-

hanced curcumin capsules from Advanced Orthomolecular Research (AOR); NPN 80027414, approved and licensed by Health Canada.

• Inability to provide consent, and pregnancy

Each capsule contains 80 mg of plant-based Longvida Optimized

Sample size

Curcumin (Turmeric Extract 25:1). This formulation, consisting of Solid Lipid Curcumin Particles (SLCP), is shown to significantly increase oral bioavailability over curcumin alone [37,38]. The study was approved by the Jewish General Hospital Research Ethics committee (Protocol: JGH-14-149, date of approval Feb 10, 2015) and authorized by Health Canada (NCT02321293)

Substance (INN):

CurcuVIVA™

NPN number

80027414

Pharmaceutical form:

Capsules

Source:

AOR

Unit strength:

Turmeric Extract 25:1 348 mg (containing 80mg Longvida® Optimized Curcumin)

Daily dose:

80 mg with an option to reduce the dose based on individual tolerability (see Section 4.5).

Duration of use:

Continuous daily dosing for 60 days.

Route of administration:

Oral (swallowed)

Posology:

Once daily

Patients with a histological diagnosis of advanced/metastatic NS-

CLC cancer and documented presence of sensitive EGFR mutation on first-line chemotherapy were recruited at the Peter Brojde Lung Cancer Centre, Jewish General Hospital to receive standard-of-care EGFR-TKI therapy (at that time: gefitinib or erlitinib or afatinib) and CURCUViva TM at 80 mg/ 1 capsule per day for 60 days. Patients then stopped curcumin and continued their EGFR-TKI with monitoring for two additional months. Safety and quality of life monitoring performed at week 2, week 4, week 8 and 2 months after completion of curcumin treatment.

J Altern Complement Integr Med ISSN: 2470-7562, Open Access Journal DOI: 10.24966/ACIM-7562/100201

There is no consensus on the required sample size for pilot feasibility studies, and recommendations vary from 10 to 60 participants [39,40]. The main objective of the study is estimating the rate (proportion) of eligible patients who are willing to participate, and who comply with their allocated intervention.

With the sample size of 20 we will be able to estimate the participation rate of 50% within 95% confidence interval of +/-10%. In general, every year, 20 of new diagnosed stage 4 NSCLC patients are found to have an EGFR mutation. Considering estimated 30% dropout and refusal rate, we determined the study period of 1.5 years.

Outcome measures Feasibility was assessed by: • Willingness of patients to participate: number of enrolled/number of approached patients • Completion rate: number of patients who finished the 60-day course • Adherence/Compliance rate: total number of capsules consumed/ capsules dispensed • Questionnaires rate: number of completed questionnaires/total number of questionnaires Quality of life (QOL) was assessed via the Functional Assessment of Cancer Therapy - Lung (FACT-L) questionnaire38 at baseline directly before starting curcumin, then after 2, 4 and 8 weeks of concurrent curcumin and EGFR-TKI treatment.

Hematological toxicity was assessed by: blood counts, serum chemistries and C-Reactive Protein (CRP) levels at baseline, weeks 2, 4, 8 and 16 weeks.

Volume 7 • Issue 5 • 100201

Citation: Esfahani K, Kasymjanova G, Awan A, Pepe C, Agulnik JS, et al. (2021) Use of Curcumine with Tyrosine Kinase Inhibitors in EGFR-mutant Non-Small Cell Lung Cancer. A Phase I prospective Cohort Trial. J Altern Complement Integr Med 7: 201.

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Adverse events were assessed during each visit. In addition, patients recorded additional new symptoms in their diary throughout the study and these were reviewed to identify new or worsening of existing symptoms. The severity of symptoms or any other potential adverse reactions was determined with reference to the National Cancer Institute Common Terminology Criteria v 4.0.

Statistical analysis All analyses were based on the Treated Set (TS), which includes all patients who were dispensed trial medication and had taken at least one dose of investigational treatment. Data was analyzed using IBM SPSS statistics 20 software (SPSS Inc., Chicago, Illinois, USA).

Given the phase 1 nature of the study and to ensure safety of patients, an interim analysis was performed after first 3 patients had completed 2 months of treatment with concurrent EGFR-TKI and curcumin and had been followed for an additional month with no clinical evidence of serious adverse events or disease progression. The prespecified decision rule was to stop the study if 1/3 patients develop serious adverse events unrelated to EGFR-TKIs. Following the interim analysis, he study was expanded to the intended 20 participants.

Demographic variables are summarized as mean (range) for continuous variables and n (%) for categorical variables.

Outcome variables were defined as: • Change in Quality of Life (QOL) was defined as the difference between the score at different time points, expressed as a mean (standard deviation). In addition, the clinically meaningful change (CMC) was defined as a 6-point cut-off for the Trial Outcome Index (TOI) and 2 points for the Lung Cancer Subscale (LCS) of the FACT-L [41]. TOI was calculated as the sum of the Physical Well-Being (PWB), Functional Well-Being (FWB) and LCS. Comparisons of repeat measures were made using ANOVA; χ2 test and paired sample t-test where appropriate. A p-value of ≤0.05 was considered statistically significant.

Figure 1: Study flow chart.

• Changes in blood parameters were analyzed using the paired t-test.

• Safety was based on all reported symptoms and/or adverse reactions. Symptoms and/or adverse reactions present at baseline were considered non-related to curcumin.

Results

Figure 2: Feasibility assessment.

Patient characteristics and interest in the study A total of 55 patients were approached to recruit the enrolment target of 20 between July 25, 2015 and April 14, 2017. Fourteen patients declined to participate in the study: 8/14 were living far from the hospital and 6 had low interest in curcumin. Of the 41/55 (75%) patients willing to participate, 20 were enrolled in the study; the remaining 21 were already taking another form of natural supplement or receiving other investigational drugs. One patient was withdrawn before commencing curcumin due to abnormal liver enzymes and CRP level, and was excluded from analysis (Figure 1).

16/19 participants completed the 60-day course of curcumin. Thus, the overall completion rate was 84%. Three patients dropped out of the study for the following reasons: disease progression, opposition to curcumin use by a treating physician, and a persistent grade 1 rash, likely related to TKI use. The adherence rate was 86 % (984/1140 capsules) (Figure 2).

J Altern Complement Integr Med ISSN: 2470-7562, Open Access Journal DOI: 10.24966/ACIM-7562/100201

Primary clinical data for the TS population are summarized in table 1. The mean age was 69, range 46 – 85. Majority of patients (79%) were Caucasian and 21% were Asian. The main metastatic sites were contralateral lungs, pleura, brain and bones. Of note, gefitinib, erlotinib and afatinib were the three EGFR-TKIs used by the studied population, as these were standard of care at the time of patient recruitment. The most common TKI used in the study populations was gefitinib (75% of patients).

Quality of life 19 patients (100%) completed FACT-L questionnaires at baseline, 17 (89%) after two weeks, and 15 (79%) after four and eight weeks.

Overall, the majority of patients reported stable or improved quality of life. Lung cancer symptoms and TOI (combined score of PWB, FWB and LCS) improved significantly by week 4 and remained Volume 7 • Issue 5 • 100201

Citation: Esfahani K, Kasymjanova G, Awan A, Pepe C, Agulnik JS, et al. (2021) Use of Curcumine with Tyrosine Kinase Inhibitors in EGFR-mutant Non-Small Cell Lung Cancer. A Phase I prospective Cohort Trial. J Altern Complement Integr Med 7: 201.

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stable until the end of the study. Emotional Well-Being improved significantly at the end of the study (Table 2).

Variable

N (%)

Ethnicity Caucasian

15 (79)

Asian

4 (21)

Subscales Baseline Mean (SD1)

Gender Male

5 (26)

Female

14 (74)

Age Mean

69

Range

46 - 85

Site of metastasis Contralateral lung

7 (28)

Pleura

6 (24)

Brain (asymptomatic) Bone Adrenal glands Peritoneum

5 (20) 5 (20) 1 (4) 1 (4)

Smoking status Ex/never smoker

14 (74)

Smoker Unknown

3 (16) 2 (11)

TKI therapy

Mean difference from the baseline at week 4 (SD) N=16

P value (baseline /week 4)

Mean difference from the baseline at week 8 (SD) N=16

P value (baseline / week 8)

N=19

Physical well-being

21.09 (3.95)

0.78 (4.2)

0.495

0.50 (5.4)

0.735

Social wellbeing

23.7 (4.11)

-2.25 (4.5)

0.075

-0.30 (5.9)

0.848

Emotional well-being*

17.86 (4.96)

0.14(3.6)

0.888

3.22 (5.8)

0.05

Functional well-being

17.93 (5.20)

1.80 (3.7)

0.082

0.73 (3.8)

0.47

Lung cancer subscale*

17.22 (5.16)

5.26 (9.4)

0.006

3.24 (7.1)

0.097

Trial outcome index *

57.14 (8.91)

5.1 (12.6)

0.011

4.50 (12.0)

0.185

Total

98.00 (12.86)

5.15 (6.3)

0.15

3.27 (14.9)

0.427

Table 2: Changes in Functional Assessment of Cancer Therapy-Lung scores.

1-standard deviation

Gefitinib

17 (89)

Erlotinib

1 (5)

Afatinib

1 (5)

Gefitinib

17 (89)

Data are shown as mean (standard deviation). *P< 0.05, vs baseline.

Table 1: Patient characteristics.

TKI: Tyrosine Kinase inhibitor.

At week 4, none of the 15 patients, who completed FACT-L, had reported worsening, and 12/15 (80%) reported clinically meaningful improvement (≥ 2 points) in lung cancer symptoms (LCS). 8/12 patients reported continues improvement on LCS at week 8. Only one patient reported worsening of TOI index (combined score of PWB, FWB and LCS) at week 4, and 7/15 reported clinically meaningful improvement (≥ 6 points), which continued to improve further in 5/7 patients at week 8 (Figure 3).

Safety Safety was assessed based on reported adverse reactions. Curcumin in combination with TKIs was generally well tolerated. A total of 47 symptoms and/or adverse reactions were reported by study participants in their diary or during scheduled visits and those occurring in 9 patients (Table 3). Diarrhea and skin rash were the most common and were almost exclusively grade 1 or 2. 33/47 (72%) AEs consisted of pre-existing symptoms, presented before starting curcumin; 13 (28%) first occurred during or shortly following the 60-day course. Only one of the 13 reporting new AEs was grade 3 leading to emergency measures and hospitalization: a myocardial infarction in a 65-year-old patient with a 40 pack-year smoking history known for dyslipidemia and peripheral artery disease. No link was found between the use of curcumin and the event. Following hospitalization, the patient continued their 60-day course to completion with no further incidents.

J Altern Complement Integr Med ISSN: 2470-7562, Open Access Journal DOI: 10.24966/ACIM-7562/100201

Figure 3: Clinically meaningful changes on Lung Cancer Score (LCS): A - at 4 weeks, C - at 8 weeks; clinically meaningful changes on Trial Outcome Index (TOI) B - at 4 weeks, D - at 8 weeks

The product was also held due to adverse events on two other occasions: it was stopped indefinitely in one patient due to a persistent grade 1 rash and held for one month in another experiencing significant nausea. Patient’s anti-emetic medication was adjusted during that time, and nausea did not recur after restarting curcumin. These two events were deemed likely related to EGFR-TKIs rather than curcumin. All other adverse events either improved or resolved throughout the treatment course.

The CRP level declined significantly (p<0.05) during the curcumin therapy combined with TKIs from 15.5 g/L at baseline to 7.38 at Volume 7 • Issue 5 • 100201

Citation: Esfahani K, Kasymjanova G, Awan A, Pepe C, Agulnik JS, et al. (2021) Use of Curcumine with Tyrosine Kinase Inhibitors in EGFR-mutant Non-Small Cell Lung Cancer. A Phase I prospective Cohort Trial. J Altern Complement Integr Med 7: 201.

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week 2 and remained decreased during entire treatment course (Figure 4). Level of CRP increased shortly after discontinuation of curcumin (p=0.104). Curcumin had no significant effect on serum aspartate aminotransferase and alanine aminotransferase, alkaline phosphatase, or albumin (Table 4).

Diarrhea

5

4

Occurred de novo during the study 1

Skin rash

5

3

2

Appetite loss

3

1

2

Dry skin

3

3

Dyspnea

3

3

Nausea

3

2

Chest pain

2

2

Cough

2

2

Dry eyes

2

2

Fatigue

2

2

Pruritus

2

2

Back pain

1

Constipation

1

Dry cough

1

Dry mouth

1

Grades

Type

1-2

3-4

Present at baseline

1

1 1

Eye infection

1

1

1

1

Insomnia

1

1 1

1

Palpitations

1

1

Sore throat

1

1

Stomatitis

1

1

Vulvitis

1

Weakness

1

Weight loss

1

Total

46

1

1 1 1 1

33

4.63 (6.75)

mg/L

40.28 (4.54)

4.49 (4.816) 40.00 (2.32)

Alkaline phosphatase

U/L

134.44 (167.52)

87.78 (30.41)

Alanine aminotransferase (ALT)

U/L

77.44 (111.53)

Aspartate aminotransferase (AST)

U/L

48.16 (48.82)

White blood cell count C-reactive protein Albumin

1

Nose bleed

g/L

Hemoglobin

1

1

10^9/L

Baseline Mean(SD) 132.87 (8.39) 6.95 (2.05)

Units

Gastroesophageal reflux Myocardial infarction

Figure 4: CRP changes during the curcumin treatment.

14

Table 3: Reported adverse events.

Discussion This is, to our knowledge the first clinical study of curcumin in combination with EGFR-TKIs for advanced/metastatic EGFR-mutant NSCLC. There is growing interest from patients with cancer to take complementary alternative medicines alongside their standard chemotherapy regimens. As a result, there is a significant interest in developing adjunctive therapies to augment currently available treatment protocols, which may reduce the burden of symptoms associated with standard anti-cancer therapies as well as potentially synergistically improving the efficacy of these regimens. However, most studies based on vitro and animal work that cannot be readily extrapolated to cancer patients [9,21,33,42]. Lack of solid pre-clinical and clinical evidence for their benefits and, more importantly, lack of harm and negative pharmacological interactions urgently required Phase I and II studies to determine safety of their use along with standard chemotherapy [43].

The results presented here demonstrate that interest in curcumin among lung cancer patients is high, as well as compliance and regimen completion rates. Use of curcumin alongside with EGFR-TKIs in EGFR mutant patients were safe; most of reported adverse events J Altern Complement Integr Med ISSN: 2470-7562, Open Access Journal DOI: 10.24966/ACIM-7562/100201

g/L

Week 4 Mean(SD) 130.20 (9.59) 6.37 (2.15)

Mean difference -2.66

P value 0.018

0.58

0.536

-0.14

0.906

-0.28

0.661

-46.66

0.193

57.28 (94.16)

-20.16

0.534

37.25 (47.64)

-10.91

0.712

Table 4: Hematologic characteristics.

were present prior to start of the trial, and the majority of those which occurred following curcumin administration were likely due to TKI use, as consistent with the existing literature [4,44-47]. There were very few adverse events related to curcumin, all of which were mild, and no biochemical evidence of toxicity was observed in the study.

Our findings are in line with other Phase I study findings which have reported curcumin to be safe and indicated no dose-limiting toxicity when taken by mouth at doses up to 12,000mg/day [21,28].

Curcumin has also been shown to suppress inflammation in various clinical trials, as revealed by reduction in circulating CRP levels and swelling, as well as histological analysis [48-54]. There exist a number of biological pathways reported in the literature involved in curcumin’s anti-inflammatory properties, namely blockage of NF-κB activation increased by several different inflammatory stimuli, and decreased oxidative stress [42,55]. In this study we demonstrated that CRP level significantly declined after 2 weeks of curcumin treatment and continued to decrease while on treatment. The rise in CRP that observed shortly after stopping curcumin could potentially represent a rebound effect, whose mechanism extends beyond the scope of our study.

Previous randomized controlled trials have demonstrated improvement in quality of life with curcumin supplementation in patients with solid tumors [31]. We did observe significant improvement in Quality of Life, especially regarding lung cancer symptoms as well as physical and functional well-being (as assessed by the Lung Cancer Subscale and Trial Outcome Index of the FACT-L questionnaire).

It is difficult, however, to determine the extent to which these changes are due to the beneficial effects of curcumin use, rather than a positive response to EGFR-TKI therapy alone.

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Citation: Esfahani K, Kasymjanova G, Awan A, Pepe C, Agulnik JS, et al. (2021) Use of Curcumine with Tyrosine Kinase Inhibitors in EGFR-mutant Non-Small Cell Lung Cancer. A Phase I prospective Cohort Trial. J Altern Complement Integr Med 7: 201.

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Limitations As any pilot studies, our study is limited because it is not extensive enough to provide conclusive results and was not designed to develop recommendations. The study was not powered to assess treatment effect of curcumin. Thus, given the nature and short duration of this trial, it is difficult to accurately assess the positive effects of curcumin alone and the specific etiology of all reported side effects in the presence of such confounding factors both in the treatment and progression of the disease. Furthermore, our study only examined feasibility of launching large-scale randomized trials in lung cancer patients.

The feasibility results do not necessarily generalize beyond the inclusion and exclusion criteria of the pilot. However, pilot studies are a necessary first step in exploring a novel applications of curcumin.

Conclusion Our small study is the only prospective clinical study of curcumin in advanced/metastatic lung cancer patients which has included safety and toxicity monitoring. As such, it provides preliminary evidence that curcumin alongside EGFR-TKIs is acceptable and safe to use in lung cancer patients. We have learned from this pilot study that a future randomized larger-scale clinical trials using this formulation of curcumin is feasible and safe. Future randomized studies will seek to assess the potential beneficial effects of curcumin with regards to survival and response to TKIs in EGFR mutant advanced lung cancer over more extended periods of time.

Declarations Sponsor: The study was sponsored by the Research Institute.

Funding: The study received private funding.

Conflicts of interest: The authors declare that they have no conflict of interest.

Ethics approval: This study was performed in line with the principles of the Declaration of Helsinki. Approval was granted by the Research Ethics Committee and authorized by Health Authorities.

Consent to participate: Written informed consent was obtained from each subject prior to their participation in the study, after adequate explanation of the aims, methods, anticipated benefits, and potential hazards.

Availability of data and material: All non-confidential original study data can be made available upon request.

Author’s contribution: All authors advised on the study protocol and planned statistical analyses. All authors had a role in writing and critical revision of the report.

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