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Introduction

Lung cancer remains the leading cause of cancer-related mortality, and non-small-cell lung cancer (NSCLC) represents ~85% of all cases (1). NSCLC has been shown to be driven by various activated oncogenes, such as epidermal growth factor receptor (EGFR) and anaplastic lymphoma kinase (ALK) (2–4). The identification of genetic driver alterations in patients with NSCLC and the use of effective targeted agents have been recommended by the National Comprehensive Cancer Network and European Society for Medical Oncology guidelines, offering new promising strategies for patients with NSCLC (5,6). To date, a number of small-molecule targeted drugs have been developed for the treatment of NSCLC, most of which are tyrosine kinase inhibitors (TKIs). Compared with traditional chemotherapy drugs, TKIs are associated with significantly improved clinical outcomes and reduced treatment-associated toxicity (7). As TKIs are given orally at a fixed dose for long periods of time, they represent an easy and convenient drug regimen for patients with cancer. However, administration of TKIs is also associated with certain risks, such as a large variability in pharmacokinetics (PK), particularly in patients with concurrent hepatic impairment (HI) or renal impairment (RI) (8,9).

HI and RI are common in patients with cancer, and they are intrinsic factors that may affect the absorption, distribution, metabolism and excretion of orally administered drugs (8,9). As a result of the alterations in drug PK, effective drug exposure may increase or decrease, leading to suboptimal efficacy or substantial toxicity. In addition, certain TKIs may induce hepatic or renal toxicities. Thus, understanding the effects of HI and RI on PK variability of specific anticancer drugs and their potential hepatotoxicity and nephrotoxicity is crucial for selecting the appropriate doses and dosing intervals, thus insuring maximum efficacy and minimal toxicity. The aim of the present review was to summarize the potential hepatotoxicity and nephrotoxicity of 17 TKIs and their PK variability in patients with HI or RI. Furthermore, based on available evidence from drug labels and published literature, dose recommendations for the 17 TKIs are provided for NSCLC patients with varying degrees of HI or RI.

TKIs approved for the treatment of NSCLC

As mentioned above, the identification of genetic driver alterations has created new therapeutic interventions for patients with NSCLC (5,6). Driver mutations identified in NSCLC include EGFR mutations, ALK rearrangement, c-ros oncogene (ROS1) rearrangement, B-RAF proto-oncogene (BRAF) V600E mutations, neurotrophin tyrosine receptor kinase gene fusions, high-level MET amplification or MET exon 14 skipping mutations, and RET rearrangements (5). As a number of the identified driver mutations activate tyrosine kinase signaling pathways, strategies to inhibit these pathways by TKIs have been developed and approved for the treatment of NSCLC (10–56). The TKIs approved for the treatment of patients with NSCLC and their PK properties are listed in Table I.

Table I. Pharmacokinetics properties of TKIs approved for the treatment of patients with non-small cell lung cancer.

Table I.

Pharmacokinetics properties of TKIs approved for the treatment of patients with non-small cell lung cancer.

				Metabolic enzymes			Excretion
TKIs	Targets	PB (%)	Vd/Vss (l)	Major	Minor	Transporters	Urinary (%)	Fecal (%)
Afatinib	EGFR, HER2/4	95	2,770a	CYP450	FMO3	P-gp, BCRP	4	85
Alectinib	ALK, RET	>99	475a	CYP3A4	NA	NA	<0.5	98
Brigatinib	ALK, ROS1, IGF-1R, FLT-3, EGFR	91	153a	CYP2C8, CYP3A4	CYP3A5	P-gp, BCRP	25	65
Cabozantinib	MET, VEGFR-1/2/3, AXL, RET, ROS1, TYRO3, MER, KIT, TRKB, FLT-3, TIE-2	≥99.7	319	CYP3A4	CYP2C9	MRP2	27	54
Ceritinib	ALK, IGF-1R, InsR, ROS1	97	4,230	CYP3A	NA	P-gp, BCRP	1.3	92
Crizotinib	ALK, c-Met, ROS1, RON	91	1,772a	CYP3A	NA	P-gp, OATP1B1, OATP1B3, OATP2B1, OCT2	22	63
Dabrafenib	BRAF V600E/V600K/V600D, CRAF, SIK1, NEK11, LIMK1	99.7	70.3	CYP2C8, CYP3A4	NA	P-gp, BCRP	23	71
Dacomitinib	EGFR, HER2/4, DDR1/2, EPHA6, LCK, MNK1	98	1,889a	CYP2D6	CYP3A4, CYP2C9	P-gp, BCRP	3	79
Entrectinib	TRKA/B/C, ROS1, ALK, JAK2, ACK1	>99	551	CYP3A4	NA	NA	3	83
Erlotinib	EGFR	93	232	CYP3A4	CYP1A2, CYP1A1	P-gp	8	83
Gefitinib	EGFR	90	1,400a	CYP3A4	CYP2D6, CYP3A5	P-gp, OATP1B3	<4	86
Larotrectinib	TRKA/B/C, TNK2,	70	48a	CYP3A4, CYP3A5	NA	P-gp, BCRP	39	58
Lorlatinib	ALK, ROS1, TYK1, FER, FPS, TRKA/B/C, FAK, FAK2, ACK	66	305a	CYP3A4, UGT1A4	CYP2C8, CYP2C19, CYP3A5, UGT1A3	NA	48	41
Osimertinib	EGFR, HER2/3/4, ACK1, BLK	95	918a	CYP3A4, CYP3A5	NA	P-gp, BCRP	14	68
Trametinib	MEK1/2, BRAF V600	97.4	214	Carboxylesterases	NA	P-gp, BSEP	<20	>80
Vandetanib	EGFR, VEGFR, RET, BRK, TIE2, EPH, SRC	94	7,450	CYP3A4	FMO1/3	OATP1B1, OATP1B3	25	44
Vemurafenib	BRAF V600E, CRAF, ARAF, SRMS, ACK1, MAP4K5, FGR	>99	106	Non-CYP enzymes	CYP3A4	P-gp, BCRP	1	94

a Steady state volume of distribution (V_ss). TKIs, tyrosine kinase inhibitors; PB, plasma protein binding; V_d, apparent volume of distribution; NA, not applicable/not available; HER, human epidermal growth factor receptor; DDR, discoidin domain receptor tyrosine kinase; EPHA, ephrin type-A receptor; LCK, leukocyte-specific protein-tyrosine kinase; MNK, MAPK-interacting serine/threonine-protein kinase; ACK, activated Cdc42-associated kinase; BLK, B lymphoid tyrosine kinase; C-met, mesenchymal-epithelial transition factor; RON, tyrosine kinase receptor macrophage-stimulating receptor; IGF-1R, insulin-like growth factor 1 receptor; InsR, insulin receptors; RET, Rearranged during transfection proto-oncogene gene; FLT, FMS-like tyrosine kinase; TYK, Tyrosine kinase; FER, Fes-related kinase; TRK, tropomyosin-related kinase; FAK, focal adhesion kinase; JAK, Janus kinase; SIK, salt-inducible kinase; NEK, never in mitosis gene A-related expressed kinase; LIMK, LIM kinase; MEK, mitogen-activated protein kinase kinase; VEGFR, vascular endothelial growth factor; SRC, Rous sarcoma oncogene; UGT, UDP-glucuronosyltransferase; FOM, flavin-containing monooxygenase; P-gp, P-glycoprotein; BCRP, breast cancer resistance protein; OATP, organic anion transporting peptide; OCT, organic cation transporters; BSEP, bile salt export pump transporter; MRP, multidrug resistance-associated protein.

Dose adjustment for patients with HI

The liver is involved in the absorption, distribution and elimination of most drugs and their metabolites (8). HI does not only affect the hepatic metabolism or biliary excretion, but may also affect protein binding (PB), intestinal enzymes and transporters, which may ultimately affect drug absorption and distribution (8,57,58). The effect of HI on the absorption of orally administered drugs is mainly the result of a reduced first-pass effect, leading to an increased bioavailability of oral drugs in patients with HI (59). Similarly, HI may increase the distribution of many drugs by decreasing the PB. Mechanisms underlying the decreased binding of drugs to plasma proteins include low levels of plasma proteins, accumulation of endogenous substances [e.g., bilirubin (Bil)], and qualitative changes in plasma proteins (60). As most drugs are metabolized by the liver, impaired hepatic function may decrease their metabolism by reducing the levels and activity of hepatic enzymes and transporters and, consequently, alter the exposure to drugs and their metabolites (61). In addition to decreased metabolizing capacity and decreased PB, reduced biliary excretion may also occur in patients with HI (62). Moreover, HI may also affect kidney function, leading to an accumulation of a drug and its metabolites, even when the liver is not primarily responsible for their elimination (63).

The extent of alterations in PK is associated with the degree of HI (58). The US Food and Drug Administration (FDA) and European Medicines Agency (EMA) recommend using the Child-Pugh (C-P) classification to categorize the degree of HI (64,65). However, studies have often used other grading systems to assess liver function (66), and the results from these different grading systems are not interchangeable and, hence, are difficult to compare with one another. Therefore, multiple HI descriptions are presented in our dose recommendations. The classification of HI by C-P score and National Cancer Institute (NCI) criteria are listed in Table II.

Table II. Classification of hepatic impairment by Child-Pugh score and NCI.

Table II.

Classification of hepatic impairment by Child-Pugh score and NCI.

Degree	Child-Pugh classification (points)	NCI classification
Mild	A (5–6)	TBil ≤ULN and AST >ULN, or TBil >1-1.5× ULN and any AST
Moderate	B (7–9)	TBil >1.5 3× ULN and any AST
Severe	C (10–15)	TBil >3 10× ULN and any AST

[i] NCI, National Cancer Institute; TBil, total bilirubin; AST, aspartate aminotransferase; ULN, upper limit of normal.

Taking the aforementioned points into account, HI may increase the bioavailability and distribution of orally administered drugs, reduce metabolizing capacity, biliary and renal excretion, consequently increasing the drug exposure (8,58). Therefore, dose adjustment should be considered in patients with HI. The dose adjustment recommendations for TKIs in NSCLC patients with HI are summarized in Table III.

Table III. Dose adjustment recommendations for TKIs in cases of HI.

Table III.

Dose adjustment recommendations for TKIs in cases of HI.

	Dose adjustment recommendations (Refs.)
TKIs	ALT/AST/Bil	NCI classification	C-P classification
Afatinib	NK	NK	C-P A and B: No dose adjustment (10,11)
			C-P C: Close monitoring (10); not recommended (11)
Alectinib	NK	Mild and moderate HI: No dose adjustment (12)	C-P A and B: No dose adjustment (12–14)
		Severe HI: NK	C-P C: 450 mg bid (12–14)
Brigatinib	NK	NK	C-P A and B: No dose adjustment (15,16)
			C-P C: 60% dose reduction (15)
Cabozantinib	NK	Mild HI: No dose adjustment (17,18)	C-P A and B: 66% dose reduction (17–19,20,21)
		Moderate and severe HI: NK	C-P C: Not recommended (17–19)
Ceritinib	NK	NK	C-P A and B: No dose adjustment (22,23)
			C-P C: 300 mg qd (22,23)
Crizotinib	ALT/AST >5× ULN with TBil ≤1.5× ULN,	Mild HI: No dose adjustment (24,25)	NK
	treatment suspension (20); ALT/AST >3× ULN	Moderate HI: 200 mg bid (24–26)
	with TBil >1.5× ULN, permanent discontinuation (20)	Severe HI: 250 mg qd (24–26)
Dabrafenib	NK	Mild HI: No dose adjustment (27–29)	NK
		Moderate and severe HI: Use with caution (28)
Dacomitinib	NK	Mild and moderate HI: No dose adjustment (30)	C-P A and B: No dose adjustment (30–32)
		Severe HI: Not recommended (31)	C-P C: Not recommended (31)
Entrectinib	NK	Mild HI: No dose adjustment (33)	NK
		Moderate and severe HI: NK
Erlotinib	ALT/AST >5× ULN, not recommended (11); AST	Severe HI: Close monitoring (34)	C-P A and B: Close monitoring (34); use with
	≥3× ULN, or DBil >17 µmol/l, 50%		caution (35); no dose adjustment (36)
	dose reduction (37)		C-P C: Not recommended (35); close monitoring (34)
Gefitinib	ALT/AST >5× ULN, treatment suspension (38)	Severe HI: Discontinuation (38)	C-P A: No dose adjustment (39)
			C-P B: Close monitoring (38)
			C-P C: Use with caution (40); close monitoring (38)
Larotrectinib	NK	NK	C-P A: No dose adjustment (41,42)
			C-P B and C: 50% dose reduction (41,42)
Lorlatinib	NK	Mild HI: No dose adjustment (43,44)	NK
		Moderate and severe HI: Not recommended (44)
Osimertinib	NK	Mild and moderate HI: No dose adjustment (45,46)	C-P A and B: No dose adjustment (45–47)
		Severe HI: Not recommended (45)	C-P C: NK
Trametinib	NK	Mild HI: No dose adjustment (48–50)	NK
		Moderate and severe HI: Use with caution (49)
Vandetanib	NK	Mild HI: No dose adjustment (51,52)	C-P A: No dose adjustment (53) C-P B and
		Moderate and severe HI: Not recommended (51,52)	C: Not recommended (51); no dose adjustment (52,53)
Vemurafenib	NK	Mild and moderate HI: No dose adjustment (54,56)	NK
		Severe HI: Close monitoring (55)

[i] TKIs, tyrosine kinase inhibitors; HI, hepatic impairment; AST, aspartate aminotransferase; ALT, alanine aminotransferase; TBil, total bilirubin; DBil, direct bilirubin; NK, not known; C-P, Child-Pugh; NCI, National Cancer Institute; ULN, upper limit of normal; bid, twice daily; qd, once daily.

Afatinib

Afatinib is metabolized only to a minor extent (~9%) and, in the circulation, forms covalent adducts with plasma proteins. Excretion of afatinib is primarily via the feces (10,11). As shown in PK studies, exposure to afatinib was not significantly altered in patients with C-P A and B; therefore, dose adjustment in this population is not deemed necessary (10,11). Subjects with C-P C have not been studied; therefore, the recommendation is to use afatinib with caution or not at all in this patient population (10,11).

Alectinib

Alectinib is eliminated primarily by the liver (12,13). In a clinical study, the combined area under the plasma drug concentration-time curve (AUC) of alectinib and its major metabolite (M4) increased by 36 and 76% in subjects with C-P B and C, respectively (14). The combined Cmax of alectinib and M4 increased by 16% in patients with C-P B and decreased by 2% in patients with C-P C (14). Therefore, dose adjustment is not necessary for patients with C-P A and B, but is necessary for patients with CP-C. In these patients, the dose should be reduced to 450 mg twice daily (12–14).

Brigatinib

Brigatinib is eliminated primarily via the liver (15,16). The brigatinib AUC was by 37% higher in subjects with C-P C compared to subjects with normal hepatic function (NHF), while subjects with C-P A and B had a similar brigatinib AUC compared to subjects with NHF (15,16). Based on these data, dose adjustment is not required for patients with C-P A and B (15,16), whereas the dose should be reduced by ~40% (i.e., from 180 to 120 mg, or from 90 to 60 mg) in patients with C-P C (16).

Cabozantinib

Based on a population PK analysis, no clinically significant differences in cabozantinib exposure were observed between subjects with mild HI (based on the NCI criteria) and those with NHF (20). In a HI study, the cabozantinib AUC and Cmax increased by 81 and 10%, respectively, in subjects with C-P A (21); for subjects with C-P B, the cabozantinib AUC increased by 63% and Cmax decreased by 29% (21). As cabozantinib exposure was significantly altered in C-P A and B, dose reduction is necessary for these patients (17–21). Cabozantinib is not recommended for use in patients with C-P C, since the safety and efficacy have not been characterized in this population (17,18).

Ceritinib

Ceritinib is primarily eliminated by the liver (22,23). A clinical study was conducted to evaluate the effect of HI on ceritinib PK. The AUC of ceritinib was increased by 18, 2 and 66% in subjects with C-P A, B and C, respectively, compared with subjects with NHF (22,23). Based on these data, dose adjustment is not required for patients with C-P A and B, but the ceritinib dose should be reduced by approximately one-third in patients with C-P C (22,23).

Crizotinib

Crizotinib is eliminated primarily by the liver (24,25). Following oral crizotinib administration at doses of 250 mg twice daily, patients with mild HI (based on the NCI criteria) exhibited similar crizotinib exposure at steady state compared to patients with NHF, with AUC and Cmax decreasing by 9% (26). Therefore, dose adjustment is not required for patients with mild HI (24–26). Patients with moderate HI exhibited higher crizotinib exposure compared to patients with NHF, with AUC and Cmax increasing by 50 and 44%, respectively (26). The crizotinib AUC decreased by 35% and Cmax decreased by 27% in patients with severe HI following crizotinib 250 mg orally once daily compared with patients with NHF following crizotinib 250 mg orally twice daily (26). Based on these results, crizotinib 200 mg twice daily is recommended for patients with moderate HI, and 250 mg once daily for patients with severe HI (24–26).

Dabrafenib

Based on a population PK analysis, the effect of mild HI (based on the NCI criteria) on the concentration of dabrafenib or its metabolites was not significant (29). Therefore, dose adjustment is not required for patients with mild HI (27–29). No data are available for patients with moderate to severe HI. However, considering that dabrafenib is mainly eliminated by the liver, patients with moderate to severe HI should be treated with caution (28).

Dacomitinib

Dacomitinib is eliminated primarily by the liver (30,31). In a dedicated HI trial, the AUC and Cmax of dacomitinib were unchanged in subjects with C-P A, whereas they decreased by 15 and 20%, respectively, in subjects with C-P B, as compared to subjects with NHF (32). Based on this trial, C-P A and B exerted no clinically important effects on the PK of dacomitinib. In addition, based on a population PK analysis, dose adjustment is not required for patients with mild and moderate HI (according to the NCI criteria) (30,31). The effect of severe HI (both NCI and C-P criteria) on dacomitinib PK is unknown, and treatment in this patient population is not recommended (31).

Entrectinib

Entrectinib is eliminated primarily via the liver (33). In a population PK analysis, no clinically significant differences in the PK of entrectinib were observed in patients with mild HI (based on the NCI criteria) compared with subjects with NHF (33). Therefore, dose adjustment is not required in this patient population (33). The impact of moderate to severe HI on the PK of entrectinib is unknown; therefore, there are currently no dose recommendations for these populations.

Erlotinib

Erlotinib is primarily eliminated by the liver (34,35). The PK and safety profiles of erlotinib in patients with C-P B were found to be similar to those with NHF; therefore, dose adjustment is not required for patients with C-P B (36). No data are available regarding the effect of C-P C on the PK of erlotinib; therefore, erlotinib must be used with caution, or not at all, in patients with CP-C (34,35). In a phase I study, the erlotinib clearance was reduced and dose-limiting toxicities were increased in patients with HI [aspartate aminotransferase ≥3× upper limit of normal (ULN), or direct Bil >17 µmol/l] (37). Therefore, a 50% dose reduction was recommended for patients with this level of HI (37).

Gefitinib

Gefitinib is cleared primarily by the liver (38,39). In a study of non-cancer patients with HI due to cirrhosis, the exposure to gefitinib was increased by 40, 263 and 166% in patients with C-P A, B and C, respectively, compared to healthy subjects (40). However, the PK of gefitinib is highly variable in subjects with HI due to cirrhosis and, considering the low dose reduction rate observed when gefitinib was administered at a dose 2-fold higher than the recommended dose, no dose adjustment was recommended in patients with HI due to cirrhosis (38–40). In case of patients with cancer, the exposure of gefitinib was similar between patients with moderate and severe HI (according to the NCI criteria) when compared to patients with NHF (40). Based on these results, dose adjustment may not be necessary for patients with HI; however, considering its hepatotoxicity, close monitoring is required for patients with C-P B and C due to liver metastases (38–40).

Larotrectinib

Larotrectinib is eliminated primarily via the liver (41,42). In a PK study, the larotrectinib AUC increased by 30, 100 and 220%, and Cmax increased by 10, 10 and 50% in patients with C-P A, B and C, respectively, when compared to subjects with NHF (41,42). Therefore, dose adjustment is not required for patients with C-P A, but the starting dose of larotrectinib should be reduced by 50% in patients with C-P B and C (41,42).

Lorlatinib

Lorlatinib is primarily metabolized in the liver and excreted in both the urine (48%) and feces (41%) (43,44). Based on a population PK analysis, no clinically meaningful differences in lorlatinib PK were observed in patients with mild HI (based on the NCI criteria) (43). Therefore, dose adjustment is not required in patients with mild HI (43,44). The effect of moderate to severe HI on lorlatinib PK is unknown; therefore, lorlatinib is not recommended for use in these patients (44).

Osimertinib

Osimertinib is eliminated primarily via the liver (45,46). In a clinical trial, the osimertinib AUC and Cmax decreased by 36.7 and 48.6%, respectively, in patients with C-P A, and by 31.6 and 39.3%, respectively, in patients with C-P B, when compared to patients with NHF (47). In terms of safety, there were no apparent differences in safety between patients with NHF and those with C-P A or B (47). In a population PK analysis, the PK of osimertinib exhibited no clinically significant differences in patients with mild or moderate HI (according to the NCI criteria), compared to patients with NHF (45,46). Therefore, based on the population PK analysis and clinical study results, dose adjustment is not necessary for patients with mild and moderate HI (both NCI and C-P criteria) (45–47). Since no study has been conducted in patients with severe HI, osimertinib is not recommended for use in this population (46).

Trametinib

Trametinib is eliminated primarily via the liver (48,49). Formal clinical studies have not been conducted to assess the effect of organ impairment on the PK of trametinib. A population PK analysis demonstrated that mild HI did not affect the PK of trametinib (50); therefore, dose adjustment is not required for this patient population (48–50). The PK of trametinib has not been investigated in patients with moderate to severe HI; therefore, trametinib should be administered with caution in this patient population (49).

Vandetanib

A PK study demonstrated that the vandetanib AUC increased by 4% in patients with C-P A and decreased by 6 and 7% in patients with C-P B and C, respectively, compared to patients with NHF (53). Given that exposure to vandetanib was not altered in subjects with HI, no dose adjustment appears to be necessary in patients with C-P A, B and C (51–53).

Vemurafenib

Vemurafenib is eliminated primarily via the liver (54,55). In clinical trials, the apparent clearance of vemurafenib was similar between patients with mild to moderate HI (based on the NCI criteria) and those with NHF, indicating that dose adjustment is not required for patients with mild to moderate HI (54,56). As few patients with severe HI were enrolled in clinical trials, close monitoring is required when vemurafenib is administered to patients with severe HI (55).

Dose adjustment for patients with RI

The kidney and the liver are the two main organs responsible for the elimination of drugs. Impaired renal function may decrease the excretion of a drug or its metabolites that are primarily or partly eliminated via the kidneys (9,58). In addition, RI may also affect the non-renal disposition of drugs that are eliminated by the liver via alterations in the expression and activity of drug-metabolizing enzymes and transporters in the liver (67,68). Although the most obvious changes with RI affect the elimination of drugs as well as their metabolites, RI may also be associated with other changes, such as absorption and PB (9). Alterations in drug absorption in patients with RI may result from delayed gastric emptying, changes in gut motility, changes in gastric pH, decrease in first-pass effect, and vomiting or diarrhea (69). Alterations in PB are a result of hypoalbuminemia and accumulation of endogenous substances (e.g., uremic toxins) (69).

The extent of PK alterations depends on the degree of RI (9,58). For example, the AUC of afatinib increased by 22 and 50% in patients with moderate and severe RI, respectively, when compared to patients with normal renal function (NRF) (70). There are several methods currently used to categorize the degree of RI in patients, among which estimated glomerular filtration rate (eGFR) is the most commonly used in clinical practice and has been included in the FDA and EMA guidelines (71). Therefore, eGFR is used as a measure of renal function in order to make dose recommendations.

In conclusion, RI not only affects the PK of renally eliminated drugs, but may also affect drugs not eliminated by the kidneys (58,67). If a drug's PK is significant altered in patients with RI, a dose adjustment is required to ensure its efficacy and safety. TKIs are considered safer than chemotherapy drugs, but may still cause serious side effects when their systemic concentrations and exposure are increased (72). Therefore, dose adjustments are required for certain TKIs in patients with RI. The dose adjustment recommendations for TKIs in NSCLC patients with RI are summarized in Table IV.

Table IV. Dose adjustment recommendations for TKIs in cases of renal impairment.

Table IV.

Dose adjustment recommendations for TKIs in cases of renal impairment.

	Dose adjustment recommendations (Refs.)
				ESRDd
TKIs	Mild impairmenta	Moderate impairmentb	Severe impairmentc	Not on HD	Requiring HD
Afatinib	No dose adjustment (10,11)	No dose adjustment (10,11,70)	30 mg qd (10)	Not recommended (11)	30 mg qd (73,74)
Alectinib	No dose adjustment (12,13)	No dose adjustment (12,13)	Withhold (12) No dose adjustment (13)	Treatment suspension (12)	50% dose reduction (75)
Brigatinib	No dose adjustment (15,16)	No dose adjustment (15,16)	50% dose reduction (15)	NK	NK
Cabozantinib	No dose adjustment (17,18,21) Use with caution (19)	No dose adjustment (17,18,21) Use with caution (19)	Not recommended (19)	Not recommended (19)	NK
Ceritinib	No dose adjustment (22,23,76)	No dose adjustment (22,23,76)	Use with caution (23)	Use with caution (23)	NK
Crizotinib	No dose adjustment (24,25,77,78)	No dose adjustment (24,25,77,78)	250 mg qd (24,25)	250 mg qd (79)	250 mg qd (80)
Dabrafenib	No dose adjustment (27–29)	No dose adjustment (27–29)	Use with caution (28)	Use with caution (28)	75 mg qd (81)
Dacomitinib	No dose adjustment (30,31)	No dose adjustment (30,31)	NK	NK	NK
Entrectinib	No dose adjustment (33)	No dose adjustment (33)	NK	NK	NK
Erlotinib	No dose adjustment (35)	No dose adjustment (35)	Not recommended (35) No dose adjustment (37)	Not recommended (35)	No dose adjustment (82,83)
Gefitinib	No dose adjustment (39)	No dose adjustment (39)	eGFR >20 ml/min, no dose adjustment; ≤20 ml/min, use with caution (39)	Use with caution (15) No dose adjustment (84)	No dose adjustment (85–88)
Larotrectinib	No dose adjustment (41,42)	No dose adjustment (41,42)	No dose adjustment (41,42)	No dose adjustment (41,42)	No dose adjustment (41,42)
Lorlatinib	No dose adjustment (43,44)	No dose adjustment (43,44)	Not recommended (44)	Not recommended (44)	NK
Osimertinib	No dose adjustment (45,46)	No dose adjustment (45,46)	Use with caution (46) No dose adjustment (89)	Use with caution (46)	No dose adjustment (90–92)
Trametinib	No dose adjustment (48–50)	No dose adjustment (48–50)	Use with caution (49)	Use with caution (49)	0.5 mg qd (81)
Vandetanib	No dose adjustment (51–53)	200 mg qd (51) Not recommended (52)	200 mg qd (51) Not recommended (52)	200 mg qd (51) Not recommended (52)	NK
Vemurafenib	No dose adjustment (54–56)	No dose adjustment (54–56)	Close monitoring (55)	Close monitoring (55)	720 mg bid (93)

a eGFR 60-89 ml/min.

b eGFR 30-59 ml/min.

c eGFR 15-29 ml/min.

d eGFR <15 ml/min. TKIs, tyrosine kinase inhibitors; NK, not known; qd, once daily; bid, twice daily; ESRD, end-stage renal disease; eGFR, estimated glomerular filtration rate; HD, hemodialysis.

Afatinib

Compared with patients with NRF, the afatinib AUC and Cmax increased by 50 and 22%, respectively, in subjects with severe RI and increased by 22 and 1%, respectively, in subjects with moderate RI (70). Based on these results, dose adjustment is not required for patients with mild to moderate RI, but a 25% dose reduction is recommended for patients with severe RI (10,11,70). In case reports, afatinib at a dose of 30 mg once daily was tolerated and effective for patients with end-stage renal disease (ESRD) undergoing hemodialysis (HD) (73,74).

Alectinib

From a patient population PK analysis, mild to moderate RI exerted no clinically meaningful effect on the exposure of alectinib and its major metabolite (M4), suggesting that dose adjustment is not required in patients with mild to moderate RI (12,13). The PK of alectinib have not been studied in patients with severe RI, but a case report demonstrated that a patient with ESRD undergoing HD was safely treated with alectinib at a dose of 600 mg daily. The patient exhibited no disease progression for 34 months (75).

Brigatinib

The brigatinib AUC was 86% higher in subjects with severe RI compared to subjects with NRF (15,16). Based on a population PK analysis, the PK of brigatinib was similar between patients with NRF and those with mild to moderate RI (15,16). Thus, dose adjustment is not required for patients with mild to moderate RI, but the dose should be reduced by ~50% in patients with severe RI (15).

Cabozantinib

Results from a study in patients with RI indicated that the cabozantinib AUC and Cmax were 30 and 19% higher, respectively, for subjects with mild RI, and 2 and 6% higher, respectively, for subjects with moderate RI compared to subjects with NRF (21). Based on the small exposure increase with mild to moderate RI, dose adjustment is not required for patients with mild to moderate RI (17–21). Since patients with severe RI have not been studied, cabozantinib is not recommended for use in this patient population (19).

Ceritinib

Based on patient population PK analysis, the ceritinib AUC in patients with mild to moderate RI was predicted to increase by 9 and 19%, respectively, compared to patients with NRF (76). These differences are not considered to be clinically relevant; hence, dose adjustment is not deemed necessary in patients with mild to moderate RI (22,23,76). Caution is recommended in patients with severe RI since there are no published PK data available for ceritinib treatment in this population (23).

Crizotinib

Patients with mild and moderate RI had a similar crizotinib exposure compared to patients with NRF (77). Similarly, a population PK analysis revealed that mild to moderate RI did not significantly affect the PK of crizotinib (78). Due to the small size of the increases in crizotinib exposure (5-15%), dose adjustment is not required for patients with mild to moderate RI (24,25,77,78). However, patients with severe RI exhibited increases in crizotinib AUC and Cmax of 79 and 34%, respectively, compared to subjects with NRF (77). Thus, crizotinib at a dose of 250 mg once daily is recommended for patients with severe RI (24,25,77). A case report demonstrated that crizotinib 250 mg once daily was tolerated and effective for a patient with ESRD not undergoing HD (79). In another case report, treatment with crizotinib 250 mg once daily in a patient with ESRD undergoing HD was well-tolerated, without any significant adverse events (80).

Dabrafenib

Based on a patient population PK analysis, mild to moderate RI did not exert an effect on the concentrations of dabrafenib or its metabolites; therefore, dose adjustment is not required for patients with mild to moderate RI (27–29). The effect of severe RI on dabrafenib PK has not been established; therefore, dabrafenib should be administered with caution to patients with severe RI (28). A case report revealed that a patient with ESRD undergoing HD continued dabrafenib 75 mg once daily and trametinib 0.5 mg once daily for 9 months, and this dose was well-tolerated and effective for the patient (81).

Dacomitinib

Based on population PK analysis, patients with mild to moderate RI had comparable dacomitinib exposure to those with NRF, indicating that dose adjustment is not required in these patients (30,31). The PK of dacomitinib has not been characterized in patients with severe RI; therefore, there are no dose adjustment recommendations for this patient group (30,31).

Entrectinib

In a population PK analysis, no clinically significant differences in the PK of entrectinib were observed in patients with mild to moderate RI; therefore, dose adjustment is not required in patients with mild to moderate RI (33). Sufficient data for severe RI are currently lacking; therefore, dose recommendations cannot be made for these patients (33).

Erlotinib

Based on PK data, erlotinib was almost unaffected by RI; therefore, dose adjustment is not required in patients with mild to moderate RI (35,37). A small study compared the PK of erlotinib and its active metabolite (OSI-420) in 3 patients with ESRD undergoing HD and 5 patients with NRF. Renal function and HD exerted only minor effects on the PK of erlotinib. No serious adverse events were reported in any of the cases, and 1 of the HD patients achieved partial response, indicating that dose adjustment is not required in patients with ESRD undergoing HD (82). A phase I and PK study was conducted to investigate the dose and PK of erlotinib in patients with HI or RI (37). The results demonstrated that patients with RI (creatinine 1.6-5.0 mg/dl) tolerated 150 mg of erlotinib daily and appear to have a clearance similar to that of patients with NRF (37). In addition, a case report revealed that erlotinib was safe and effective for a patient with ESRD undergoing HD (83).

Gefitinib

RI is unlikely to significantly affect the PK of gefitinib, since <4% of gefitinib and its metabolites are excreted by the kidney (38,39). Therefore, the EMA recommended that dose adjustments are not required in patients with eGFR >20 ml/min/1.73 m2, but gefitinib should be administered with caution to patients with eGFR ≤20 ml/min1.73 m2 (39). For patients with ESRD, several case reports revealed that gefitinib administered as 250 mg once daily was safe and effective for patients with ESRD not on HD, or patients undergoing HD or peritoneal dialysis (84–88).

Larotrectinib

Following oral administration of a single 100-mg dose of larotrectinib to subjects with ESRD, the larotrectinib AUC increased by 46% and Cmax increased by 25% when compared to subjects with NRF (41,42). Therefore, dose adjustment is not required for patients with RI of any severity (41,42).

Lorlatinib

Based on population PK analysis, no clinically meaningful differences in lorlatinib PK were observed in patients with mild to moderate RI, suggesting that dose adjustment is not required in patients with mild to moderate RI (43,44). The effect of severe RI on lorlatinib PK is unknown; therefore, use of lorlatinib in this patient population is not recommended (44).

Osimertinib

No clinical studies have been conducted to evaluate the effect of RI on the PK of osimertinib. Based on a population PK analysis, the osimertinib exposure was similar among patients with mild to severe RI and those with NRF (45,46,89). Patients with ESRD have not been analyzed, but three case reports revealed that osimertinib at a dose of 80 mg orally once daily was safe and effective for patients with ESRD undergoing HD (90–92). Based on these results, dose adjustment is not required for patients with mild to severe RI, or patients with ESRD undergoing HD (45,46,89–92).

Trametinib

A population PK analysis demonstrated that mild to moderate RI did not affect the PK of trametinib; therefore, dose adjustment is not required for these patient populations (48–50). As the effect of severe RI on the PK of trametinib is unknown, caution is suggested when trametinib is administered to patients with severe RI (49). In one case report, administration of dabrafenib 75 mg once daily combined with trametinib 0.5 mg once daily was well-tolerated and effective for a patient with ESRD undergoing HD (81).

Vandetanib

In a PK study, the AUC and Cmax of vandetanib increased by 46 and 7%, 62 and 9%, and 79 and 11% in patients with mild, moderate and severe RI, respectively, when compared to subjects with NRF (53). Clinical data suggested that dose adjustment is not required in patients with mild RI. The FDA and EMA recommendations differ in regards to patients with moderate to severe RI (51,52). The FDA recommends reducing the vandetanib dose in these patients (51), whereas the EMA indicates that vandetanib is not recommended for these patients due to limited data availability (52).

Vemurafenib

In a population PK analysis, the clearance of vemurafenib in patients with mild to moderate RI was similar to that in patients with NRF (56), indicating that dose adjustment is not required for patients with mild to moderate RI (54–56). The effect of severe RI on vemurafenib PK is unknown; therefore; close monitoring is required when vemurafenib is administered to patients with severe RI (55). Based on one case report, administration of vemurafenib at a dose of 720 mg twice daily was safe and effective for a patient with ESRD undergoing HD (93).

Potential, hepatotoxicity and nephrotoxicity of TKIs

Some TKIs may cause hepatic and renal toxicity (94,95), with the most common hepatic toxicities induced by TKIs include increases in the hepatic alkaline phosphatase and Bil. The most common renal toxicities induced by TKIs included proteinuria (with increased serum creatinine), acute kidney injury, chronic kidney disease and renal failure (95). To reduce the risk of hepatic and renal side effects, the use of potentially hepatotoxic or nephrotoxic TKIs requires specific monitoring and, when available, specific prevention methods in patients who already have abnormal hepatic or renal function (94–96). The incidence, severity and pattern of hepatic and renal toxicities may differ among different TKIs. The present review summarized the potential hepatotoxicity and nephrotoxicity of 17 TKIs in order to provide information for clinicians and pharmacists when prescribing these drugs to patients with HI or RI. The potential hepatotoxic and nephrotoxic effects of TKIs are listed in Table V.

Table V. Potential hepatotoxic and nephrotoxic effects of TKIs.

Table V.

Potential hepatotoxic and nephrotoxic effects of TKIs.

TKIs (Refs.)	Hepatotoxicity	Nephrotoxicity
Afatinib (10,11,98)	Any grade: ALT elevation (20.1-54%),	Any grade: Creatinine clearance decreased (49%)
	AST elevation (15.1-46%),	Grade 3/4: Creatinine clearance decreased (2%)
	ALP elevation (34-51%), Bil elevation (16%)	Acute renal failure (0.3%)
	Grade 3/4: ALT elevation (2%),
	AST elevation (0.4-3%), ALP elevation (2-3%),
	Bil elevation (1%) Fatal HI (0.2%)
Alectinib (12,13,99,100)	Any grade: ALT elevation (14%),	Any grade: RI (12%), creatinine increased (7.2%),
	AST elevation (15%), ALP elevation (6.2%),	AKI (1%)
	Bil elevation (18%) Grade 3/4:	Grade 3/4: RI (3.9%), creatinine increased (0.7%),
	ALT elevation (3.7%), AST elevation (3.7%),	AKI (1%)
	ALP elevation (0.2%), Bil elevation (3.2%)
Brigatinib (15,16,101)	Any grade: ALT elevation (40%),	Any grade: Creatinine increased (2%)
	AST elevation (65%), ALP elevation (29%),	Grade 3/4: Creatinine increased (0%)
	Bil elevation (18%) Grade 3/4:
	ALT elevation (2.7%), AST elevation (0%),
	ALP elevation (0.9%), Bil elevation (3.2%)
Cabozantinib (17–19,102)	Any grade: ALT elevation (86%),	Proteinuria (1-10%), dysuria (1-10%),
	AST elevation (86%), ALP elevation (52%),	hematuria (1-10%)
	Bil elevation (25%) Grade 3/4:	Acute renal failure (<1%)
	ALT elevation (6%), AST elevation (3%),
	ALP elevation (3%), Bil elevation (2%)
Ceritinib (22,23,103)	Any grade: ALT elevation (80-91%),	Any grade: Creatinine increased (22.1-77%)
	AST elevation (75-86%),	Grade 3/4: Creatinine increased (0.5-4.2%)
	ALP elevation (81%), Bil elevation (15%)	Renal failure (2%), RI (1%)
	Grade 3/4: ALT elevation (27-34%),
	AST elevation (13-21%), ALP elevation (12%),
	Bil elevation (0.5-1%)
Crizotinib (24,25,101)	Any grade: ALT elevation (76-79%),	Any grade: eGFR decreased (76%), creatinine
	AST elevation (61-66%), Bil elevation (4.7%)	increased (8-23%)
	Grade 3/4: ALT elevation (15-17%),	Grade 3/4: eGFR decreased (3.6%), creatinine
	AST elevation (8-9%), Bil elevation (0%)	increased (0.7-2%)
	Fatal hepatotoxicity (0.1%),	Renal cysts (3-5%), acute renal failure (<1%),
	Hepatic failure (1%)	renal failure (<1%)
Dabrafenib	Any grade: ALT elevation (48%),	Any grade: Creatinine increased (21%),
(27,28,104,105)	AST elevation (57%), ALP elevation (38%)	Grade 3/4: Creatinine increased (1.1%)
	Grade 3/4: ALT elevation (5%),	Renal failure (<1%),
	AST elevation (6%), ALP elevation (1%)
Dacomitinib (30,31,106)	Any grade: ALT elevation (40%),	Any grade: Creatinine increased (24%)
	AST elevation (35%), ALP elevation (22%),	Grade 3/4: Creatinine increased (0%)
	Bil elevation (16%) Grade 3/4:
	ALT elevation (1.4%), AST elevation (0.5%),
	ALP elevation (0.5%), Bil elevation (0.5%)
Entrectinib (33,107)	Any grade: ALT elevation (36%),	Any grade: Creatinine increased (73%)
	AST elevation (42%), ALP elevation (25%)	Grade 3/4: Creatinine increased (2.1%)
	Grade 3/4: ALT elevation (2.8%),
	AST elevation (2.5%), ALP elevation (0.9%)
Erlotinib (34,35,108,109)	Any grade: ALT/AST elevation (35-45%)	Severe acute renal failure (0.5%),
	Grade 3/4: ALT/AST elevation (10-14%)	renal disorders (3.1%)
	Hepatic failure, Hepatorenal syndrome	Grade 3/4: Renal disorders (1.1%)
Gefitinib (38,39,106,110)	Any grade: ALT elevation (34-38%%),	Any grade: Creatinine increased (1.5-16%)
	AST elevation (40-57%), Bil elevation (22%)	Grade 3/4: Creatinine increased (0.5%)
	Grade 3/4: ALT elevation (2.4-13%),	AKI or nephrotic syndrome (few cases)
	AST elevation (2-8%), Bil elevation (0.5%)
Larotrectinib (41,42,111)	Any grade: ALT elevation (45%),	Any grade: Creatinine increased (13%)
	AST elevation (45%), ALP elevation (30%)	Grade 3/4: Creatinine increased (0%)
	Grade 3/4: ALT elevation (3%),
	AST elevation (3%), ALP elevation (3%)
Lorlatinib (43,44,112)	Any grade: ALT elevation (28%),	Not reported
	AST elevation (37%), ALP elevation (24%)
	Grade 3/4: ALT elevation (2.1%),
	AST elevation (2.1), ALP elevation (1%)
Osimertinib (45,46,113)	Any grade: ALT elevation (6-21%),	Any grade: Creatinine increased (12.2%)
	AST elevation (5-22%), Bil elevation (14%)	Grade 3/4: Creatinine increased (0%)
	Grade 3/4: ALT elevation (0.7%),
	ALT elevation (1.1%), Bil elevation (0%)
Trametinib	Any grade: ALT elevation (39%),	Any grade: Creatinine increased (21%)
(48,49,104,105)	AST elevation (60%), ALP elevation (24%)	Grade 3/4: Creatinine increased (1.1%)
	Grade 3/4: ALT elevation (3%),
	AST elevation (2%), ALP elevation (2%)
Vandetanib (51,52,114)	Any grade: ALT elevation (51%),	Any grade: Creatinine increased (16%)
	Bil elevation (13%) Grade 3/4:	Grade 3/4: Creatinine increased (0%)
	ALT elevation (2%), Bil elevation (0%)
Vemurafenib (54,55,115)	Any grade: ALT elevation (67%),	Grade 1/2: Creatinine increased (26-86%)
	AST elevation (71%), ALP elevation (69%),	Grade 3/4: Creatinine increased (1.2-9.1%)
	Bil elevation (33%) Grade 3/4:
	ALT elevation (11%), AST elevation (7%),
	ALP elevation (7%), Bil elevation (2%)

[i] TKIs, tyrosine kinase inhibitors; AST, aspartate aminotransferase; ALT, alanine aminotransferase; Bil, bilirubin; ALP, alkaline phosphatase; HI, hepatic impairment; RI, renal impairment; AKI, acute kidney injury; eGFR, estimated glomerular filtration rate.

When patients do not exhibit HI and RI prior to TKI treatment but develop TKI-induced HI or RI, the dose modification schedule is based on the grade of the adverse events. For example, if patients experience grade 3 RI during alectinib treatment, the recommendation is to temporarily suspend alectinib until serum creatinine recovers to ≤1.5 times the ULN, then resume at a reduced dose; alectinib should be permanently discontinued if patients experienced grade 4 RI during treatment.

Discussion

Current evidence suggests that severe RI or ESRD may significantly affect the PK of drugs that are primarily eliminated by the liver, whereas the effects are not significant for mild and moderate RI (67,68,94). As shown in the present review, most TKIs are primarily eliminated via the liver, indicating that the effects of mild and moderate RI on the PK of most TKIs are not clinically relevant. It was herein demonstrated that, apart from vandetanib, dose adjustment is not required for the other 16 TKIs in patients with mild or moderate RI. However, for patients with severe RI or ESRD, it is recommended that TKIs be administered with caution and dose reductions be carefully established; otherwise, TKIs should not be used at all.

Since most TKIs are eliminated by the liver, the effects of HI on the PK of TKIs may be more significant compared with the effects of RI (8,58,97). According to the present review, 1 TKI (cabozantinib) requires dose reduction in patients with mild HI; 3 TKIs (crizotinib, larotrectinib, cabozantinib) require dose reduction and 2 TKIs (lorlatinib, vandetanib) are not recommended for use in patients with moderate HI; 5 TKIs (crizotinib, ceritinib, alectinib, brigatinib, larotrectinib) require dose reduction and 11 TKIs are recommended to be used with caution or not at all, in patients with severe HI.

For certain TKIs (e.g., vandetanib), dose adjustment recommendations differ between the FDA and EMA (51,52). In order to provide more data to help physicians decide on individual treatment options, and taking into consideration the regulatory laws of each country, both recommendations were included in this review. Moreover, a number of clinical trials have excluded patients with ESRD undergoing HD, and only a few case reports have reported the safety and efficiency of certain TKIs in patients with ESRD undergoing HD; those case reports were included in this review in order to provide more information on drug administration in patients ESRD undergoing HD.

As some TKIs can induce hepatic and renal toxicities, it is important to monitor hepatic and renal function in patients receiving potentially hepatotoxic or nephrotoxic drugs (98–115). If prescription of a hepatotoxic or nephrotoxic drug is necessary for patients with HI or RI, and there are no better tolerated alternatives, preventive methods, including hepatic and renal function monitoring, adverse reactions monitoring and appropriate dosage adjustment, should be considered.

To date, there are several methods available for selecting an appropriate dose in patients with HI or RI, such as physiologically based pharmacokinetics (PBPK) models, two-stage PK studies, and population PK studies (50,56,116,117). However, the physiological bases of the alterations in the absorption, distribution, metabolism and excretion characteristics in patients with HI or RI have not been fully elucidated, and the PK of a drug may display high interindividual variability in patients with HI or RI. Therefore, dose recommendations cannot be made with a high level of granularity and precision (116). To overcome interindividual variability in PK and confirm the attainment of target concentrations, therapeutic drug monitoring may be the best option for patients with HI or RI, and should be considered early after initiation of therapy (118). In addition, close monitoring of potential adverse reactions is required for patients with HI or RI.

Conclusion

The PK profile of a drug for individuals with HI or RI may lead to either increased or decreased drug exposure, necessitating dose adjustment. However, the number of clinical trials that provide data from patients with HI or RI is scarce, particularly for patients with severe HI or RI, making it is difficult to select an appropriate TKI dosage. The aim of the present review was to aid clinicians by providing dose recommendations for 17 TKIs in patients with varying degrees of HI or RI. The described dose adjustment is a preventive method for reduce the risk of toxicities for patients who already have abnormal hepatic or renal function. When patients experience TKI-induced HI or RI, the dose modification schedule is based on the grade of adverse events.

Acknowledgements

Not applicable.

Funding

No funding was received.

Availability of data and materials

All data generated or analyzed during the present study are included in this published article.

Authors' contributions

DZ and JW designed the study and revised the manuscript. DZ, JC and XL performed the literature search. DZ drafted the manuscript. All the authors have read and approved the final version of this manuscript.

Ethics approval and consent to participate

Not applicable.

Patient consent for publication

Not applicable.

Competing interests

All the authors declare that they have no competing interests.

References