Namju Kim; Jin Won Kim; Je-Hyun Baek; Jin-Soo Kim; Ho-Kyung Choung; Tae-Yong Kim; Kyung-Hun Lee; Yung-Jue Bang; Sang In Khwarg; Sang-Hoon Ahn; Do Joong Park; Hyung-Ho Kim; Jae-Yong Chung; Soyeon Ahn; Keun-Wook Lee

doi:10.4143/crt.2016.569

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Original Article S-1–Induced Lacrimal Drainage Obstruction and Its Association with Ingredients/Metabolites of S-1 in Tears and Plasma: A Prospective Multi-institutional Study: Namju Kim, MD¹, Jin Won Kim, MD², Je-Hyun Baek, PhD³, Jin-Soo Kim, MD⁴, Ho-Kyung Choung, MD⁵, Tae-Yong Kim, MD⁶, Kyung-Hun Lee, MD⁶, Yung-Jue Bang, MD⁶, Sang In Khwarg, MD⁷, Sang-Hoon Ahn, MD⁸, Do Joong Park, MD⁸, Hyung-Ho Kim, MD⁸, Jae-Yong Chung, MD⁹, Soyeon Ahn, PhD¹⁰, Keun-Wook Lee, MD^2,; Cancer Research and Treatment : Official Journal of Korean Cancer Association 2018;50(1):30-39.
DOI: https://doi.org/10.4143/crt.2016.569
Published online: February 27, 2017

¹Department of Ophthalmology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea

²Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea

³Center of Biomedical Mass Spectrometry, Diatech Korea Co., Ltd., Seoul, Korea

⁴Department of Internal Medicine, Seoul National University Boramae Medical Center, Seoul, Korea

⁵Department of Ophthalmology, Seoul National University Boramae Medical Center, Seoul, Korea

⁶Department of Internal Medicine, Seoul National University College of Medicine, Seoul National University Hospital, Seoul, Korea

⁷Department of Ophthalmology, Seoul National University College of Medicine, Seoul National University Hospital, Seoul, Korea

⁸Department of Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea

⁹Department of Clinical Pharmacology and Therapeutics, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea

¹⁰Medical Research Collaborating Center, Seoul National University Bundang Hospital, Seongnam, Korea

Correspondence: Keun-Wook Lee, MD Department of Internal Medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 166 Gumi-ro, Bundang-gu, Seongnam 16320, Korea
Tel: 82-31-787-7037 Fax: 82-31-787-4098 E-mail: hmodoctor@snubh.org

• Received: December 2, 2016 • Accepted: February 12, 2017

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/3.0/) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Abstract

Purpose
This prospective study was conducted to determine the incidence of lacrimal drainage obstruction (LDO) during S-1 chemotherapy and evaluate the association between the development of LDO and the concentrations of ingredients/metabolites of S-1 in tears and plasma.
Materials and Methods
A total of 145 patients with gastric cancer who received adjuvant S-1 therapy were enrolled. Ophthalmologic examinations were performed regularly during S-1 chemotherapy. Concentrations of tegafur, 5-chloro-2,4-dihydroxypyridine (CDHP), and 5-fluorouracil at steady-state trough level were measured in both tears and plasma.
Results
Fifty-three patients (37%) developed LDO. The median time to the onset of LDO was 10.9 weeks, and LDO developed most frequently in the nasolacrimal duct. Univariable analyses revealed that an older age (≥ 70 years), creatinine clearance rate (Ccr) < 80 mL/min, 5-fluorouracil concentration in plasma ≥ 22.3 ng/mL (median), CDHP concentration in plasma ≥ 42.0 ng/mL (median), and tegafur concentration in tears ≥ 479.2 ng/mL (median) were related to increased development of LDO. Multivariable analysis indicated that a high plasma 5-fluorouracil concentration was predictive of increased development of LDO (hazard ratio, 2.02; p=0.040), along with older age and decreased Ccr. Patients with LDO also developed S-1–related non-hematologic toxicity more frequently than those without LDO (p=0.016).
Conclusion
LDO is a frequent adverse event during S-1 chemotherapy. An older age, decreased Ccr, and high plasma 5-fluorouracil concentration were found to be independent risk factors for LDO. The high incidence of LDO warrants regular ophthalmologic examination and early intervention in patients receiving S-1 therapy.
Key words: Lacrimal drainage obstruction, S-1, Fluorouracil, Tears, Stomach neoplasms

Introduction

S-1 is an oral antineoplastic agent widely used for the treatment of gastric cancer and other gastrointestinal cancers. S-1 consists of tegafur (5-fluorouracil prodrug), 5-chloro-2, 4-dihydroxypyridine (CDHP), and potassium oxonate [1]. Lacrimal drainage obstruction (LDO) is an interesting adverse effect of antineoplastic agents that is more commonly associated with S-1 [2-5]. We previously performed a large-scale retrospective study that revealed the incidence of LDO after S-1 treatment is not infrequent [2]. However, all studies conducted to date were retrospective in nature [2-5], and the development mechanisms of S-1–induced LDO have not yet been systematically investigated.

In this study, we investigated whether an ingredient (tegafur or CDHP) or active metabolite (5-fluorouracil) of S-1 directly influenced the development of S-1–induced LDO. To determine if LDO development is caused by a local effect (direct damage to the lacrimal drainage system by either 5-fluorouracil or an ingredient of S-1 in tears) or by one of the systemic adverse effects of S-1, we measured the concentrations of tegafur, CDHP, and 5-fluorouracil in both tears and plasma. To our knowledge, this is the first prospective study to investigate the incidence of S-1–induced LDO and explore the association between the LDO development and the concentrations of ingredients/metabolites of S-1 in tears and plasma.

Materials and Methods

1. Patient population and adjuvant S-1 chemotherapy

Patients with gastric or gastroesophageal junction adenocarcinoma, who underwent curative gastrectomy with D2 lymph node dissection and received adjuvant S-1 chemotherapy, were enrolled from three institutions between December 2010 and June 2013. Before the initiation of S-1 chemotherapy, the patients had adequate bone marrow, renal and hepatic functions, and fully recovered from gastrectomy. The planned duration of S-1 chemotherapy was 1 year. S-1 was orally administered twice a day for 4 weeks, followed by a 2-week rest period (every 6 weeks). The dose of S-1 was determined as follows: 60 mg for a body surface area (BSA) of ≥ 1.50 m²; 50 mg for a BSA of 1.25-1.49 m²; and 40 mg for a BSA of < 1.25 m². The S-1 dose and schedule modification based on toxicity was described in detail previously [2,6,7]. Data describing S-1–related adverse events were collected until the completion of S-1 treatment. Adverse events were graded using National Cancer Institute Common Terminology Criteria for Adverse Events ver. 4.0. This study was approved by the Institutional Review Boards at the three institutions and followed the Declaration of Helsinki. Written informed consent was obtained from all patients.

2. Ophthalmologic evaluation

Comprehensive ophthalmic assessments were routinely performed until the completion of S-1 therapy (at 3 weeks and 3, 6, 9, and 12 months after the initiation of S-1) or until LDO development during S-1 therapy. Patients who had preexisting LDO at the baseline examination before the S-1 initiation were excluded. Ophthalmologic assessments consisted of visual acuity and intraocular pressure measurements; namely, slit-lamp examination to measure the tear meniscus height, a fluorescein dye disappearance test (FDDT) to estimate the physiological tear drainage function and a lacrimal irrigation test to identify the lacrimal drainage patency. The LDO was defined as partial or total obstruction of the lacrimal drainage system when all of the following conditions were met: high tear meniscus, delayed FDDT, and partial or total regurgitation on the lacrimal irrigation test. Once LDO was diagnosed, diagnostic lacrimal probing was routinely performed to locate the site of obstruction. Dacryocystography was recommended to the patients who developed LDO.

3. Collection of tears and blood

Tears and blood were obtained on the third week after initiation of S-1 chemotherapy, immediately before the patients took S-1, when S-1 was at a steady-state trough level. If samples could not be acquired at this time point, sample acquisition at another time point was allowed if the patient took S-1 for at least 7 consecutive days. The detailed methods for the collection of tears and blood are described in the Supplementary Methods.

4. Measurement of tegafur, CDHP, and 5-fluorouracil concentrations

Tegafur, CDHP, and 5-fluorouracil concentrations in tears and plasma were determined by the method described by Liu et al. [8], with minor modifications. The methods are described in detail in the Supplementary Methods.

5. Statistical considerations and sample size

To calculate the initial sample size, the incidence of LDO was presumed to be about 20% according to our previous study [2]. A total of 200 patients were required to detect an effect size of 0.5 in the 5-fluorouracil concentration, assuming a power of 80% at a significance level of 0.05. During the early phase in this study, we observed that the actual incidence of LDO was likely to be higher than expected. Therefore, in April 2012, we recalculated the sample size as 140 (49 patients with LDO and 91 without LDO) based on the revised assumption of the incidence of LDO (about 35%). We aimed to recruit 180 patients considering the possibility of early dropouts (about 25%) secondary to toxicity or a failure to return for a scheduled ophthalmologic follow-up visit. The study protocol recommended that the ophthalmologic evaluation be conducted until the completion of S-1 therapy if LDO did not develop during S-1 therapy. However, since the cumulative incidence of LDO reached a plateau around 6 months after the initiation of S-1 in our previous study [2], the protocol considered patients without the LDO development to have completed the required ophthalmologic follow-up visits if ophthalmologic evaluation was conducted until at least 6 months after the initiation of S-1. As planned, patients without LDO development, whose ophthalmologic follow-up was less than six months, were excluded from the final analyses.

The cumulative incidence of LDO was calculated from the date of S-1 initiation until the date of LDO diagnosis using the Kaplan-Meier method. Log-rank tests were conducted to investigate differences in the incidence of LDO among comparison groups in univariable analyses. Cox proportional hazards models were conducted to investigate the impact of specific risk factors on LDO development in multivariable analysis. IBM SPSS for Windows (IBM Corp., Armonk, NY) was used for data analysis, and p-values of < 0.05 were considered significant. All tests were two-tailed.

Results

1. Patient characteristics

A total of 180 patients were initially enrolled in this study. Of these, five were excluded owing to inadequate tear volume acquisition. Thirty patients who did not develop LDO and whose ophthalmologic follow-up period was less than six months were also excluded (Fig. 1). Therefore, 145 patients were included in the final analysis. The median age was 59 years (range, 22 to 82 years) and the median level of creatinine clearance rate (Ccr) was 79 mL/min (range, 41 to 148 mL/min). Among the 145 patients, 137 (94%) completed the planned 1-year S-1 therapy. Detailed patient characteristics are presented in Table 1.

2. Development of LDO

Fifty-three patients (37%, 53/145) developed LDO, and the cumulative incidences of LDO were 22%, 31%, 36%, and 37% at 3, 6, 9, and 12 months after the S-1 initiation, respectively (Fig. 2). Among the 53 patients with LDO, 45 underwent dacryocystography, and all the cases showed narrowing or obstruction of the lacrimal drainage system. The median time to the development of LDO in these 53 patients was 10.9 weeks (95% confidence interval, 9.4 to 12.4; range, 1.0 to 43.9 weeks) after the initiation of S-1, and 85% of the LDO cases (45/53) were developed within 6 months of starting the S-1 treatment. The most common site of obstruction was the nasolacrimal duct (n=42), followed by the punctum (n=15) and canaliculus (n=13) (S1 Fig.). Fifteen patients had LDO at two or more levels simultaneously. When additional analysis was conducted that included all patients initially enrolled into this study (n=180), the cumulative incidence of LDO was not different from that for the 145 patients included in the final analysis (S2 Fig.). Management and clinical course of LDO are described in detail in the supplementary file (S3 Fig.).

3. Concentrations of tegafur, 5-fluorouracil, and CDHP in tears and plasma

We measured the trough concentrations of tegafur, CDHP, and 5-fluorouracil in a steady state in both tears and plasma. However, only tegafur was detected in tears, while neither CDHP nor 5-fluorouracil was detected. All three components were detected in plasma. Correlations among the concentrations of tear tegafur, plasma tegafur, plasma 5-fluorouracil, plasma CDHP, and the level of Ccr were explored. We found strong positive correlations among the tear tegafur, plasma tegafur, plasma 5-fluorouracil, and plasma CDHP concentrations. In contrast, negative correlations were observed among Ccr and the plasma 5-fluorouracil and plasma CDHP concentrations (Fig. 3).

4. Risk factors for the development of LDO

In univariable analyses conducted to identify predictors of the LDO development, clinical parameters and the S-1 component (or 5-fluorouracil) concentrations in both tears and plasma were included. Among the clinical parameters, the older age (≥ 70 years) and decreased Ccr (< 80 mL/min) were related to the increased LDO development (p < 0.05). The sex or extent of gastrectomy was not predictive of LDO development. Regarding the S-1–related compounds, patients with increased concentrations of plasma 5-fluorouracil (≥ 22.3 ng/mL [median], p < 0.001), plasma CDHP (≥ 42.0 ng/mL [median], p=0.032), and tear tegafur (≥ 479.2 ng/mL [median], p=0.006) developed LDO more frequently. However, the concentration of plasma tegafur was not associated with LDO development (Table 2, Fig. 4).

Multivariable analysis revealed that older age and decreased Ccr were independent risk factors for LDO development. Specifically, as the level of Ccr decreased, the risk of LDO increased, as indicated by a hazard ratio (HR) of 2.52 in patients with 60 ≤ Ccr < 80 and 3.21 in those with Ccr < 60 mL/min. Among the S-1–related compounds, only a high concentration of plasma 5-fluorouracil was predictive of the increased LDO development (HR, 2.02; p=0.040). The patients with a high tear tegafur concentration tended to show increased LDO development, but the trend was not statistically significant (p=0.055). The concentrations of plasma tegafur or CDHP did not show an independent effect on LDO development in the multivariable model (Table 2).

5. LDO and other S-1 toxicities

The toxicity profiles developed during S-1 therapy are presented in the supplementary file (S4 Table). Frequencies of hematologic and non-hematologic toxicities were compared between patients with and without LDO. Patients who developed LDO also developed non-hematologic toxicities (grade ≥ 2) more frequently than those without LDO (p=0.016). In contrast, there was no difference in the frequencies of hematologic toxicities between patients with and without LDO (Table 3).

Discussion

In this prospective study, we found that the incidence of LDO in patients receiving S-1 chemotherapy was 37%, which is much higher than the incidence (8%-18%) reported in previous retrospective studies [2-5]. Some patients would not seek medical care; therefore, the incidence of S-1–induced LDO is thought to have been underestimated in these studies. We also found that the development of S-1–induced LDO is related to an older age, decreased Ccr, and an increased plasma concentration of 5-fluorouracil.

There have been a few studies in which tear concentrations of systemically administered drugs, such as docetaxel and 5-fluorouracil [9-11], were measured. Esmaeli et al. [9] reported that docetaxel was found in tear samples collected immediately after docetaxel infusion and suggested that the secretion of docetaxel in tears might be a mechanism for tear drainage obstruction. Loprinzi et al. [11] reported that 5-fluorouracil was detectable in the tears of 12 patients within several minutes after the 5-fluorouracil infusion; however, they stated that the tear concentrations of 5-fluorouracil were not correlated with the development of ocular toxicity. Our study is the first prospective report on the incidence of S-1–induced LDO and the only report that analyzed the concentrations of S-1 components in tears. We collected tears and plasma when the drug concentration was at a steady-state trough level to minimize the interpatient variations in S-1 component (or 5-fluorouracil) concentrations under the same conditions. The concentration of CDHP or 5-fluorouracil could not be measured, and only the tegafur concentration could be analyzed in tears. Considering that the median CDHP/tegafur and 5-fluorouracil/tegafur ratios in plasma were 0.02 and 0.01, respectively, and the tear-to-plasma ratio of the median tegafur concentrations was 0.26, the concentrations of CDHP and 5-fluorouracil in tears are thought to be in a too low range to be detected by the analysis system.

We demonstrated that the plasma concentration of 5-fluorouracil is an independent risk factor for LDO development. Non-hematologic toxicities were more frequent in patients who developed LDO. These findings strongly suggest that the S-1-induced LDO is caused by damage to and inflammation of the lacrimal drainage system, mainly due to the systemic effects of S-1 rather than to direct contact between the mucosal lining of the lacrimal drainage system and S-1 components or 5-fluorouracil in tears [12]. This suggested mechanism also explains the finding that S-1–induced LDO is more frequently located in the nasolacrimal duct (distal lacrimal drainage) than in puncta or canaliculus (proximal lacrimal drainage). In fact, there are abundant vascular plexuses in the wall of the nasolacrimal duct; therefore, the systemic blood supply easily reaches the submucosal space of the nasolacrimal duct [13,14]. If the local effect of S-1 components or 5-fluorouracil on the development of LDO was predominant, obstructions in the puncta or canaliculus would be more common than those in the nasolacrimal duct. The frequent development of LDO in older patients or in patients with decreased Ccr would also be explained by a systemic effect of S-1.

However, we cannot completely exclude the possibility that S-1 components or 5-fluorouracil in tears exert a local effect on the lacrimal drainage system and additionally contribute to the S-1–induced LDO development since tegafur was only detected in tears with our analysis equipment. The high tegafur concentration in tears was related to the increased LDO development upon univariable analysis, but this statistical significance disappeared (p=0.055) when the multivariable analysis was conducted. The concentrations of CDHP and 5-fluorouracil in tears were too low to be detected by the analysis equipment; thus, we think that their local effects on the LDO development would be minor, if any. In addition, we measured the concentrations of the S-1–related compounds at the steady-state trough level, but not at the steady-state peak level. Thus, we cannot completely exclude the possibility that the development of S-1–induced LDO might be more influenced by peak levels of S-1 ingredients/metabolites when compared to the effects caused by the trough levels.

In our previous retrospective study [2], we reported that total gastrectomy was a risk factor for the development of S-1–induced LDO. However, total gastrectomy did not seem to be related to the increased development of LDO in the present study (Table 2, S5 Fig.), although there was a considerable difference in the 1-year cumulative incidence of LDO between total gastrectomy (46.0%) and partial gastrectomy (34.6%). Since the sample size in the present study aimed to provide sufficient power for detecting differences in 5-fluorouracil concentration, but not for detecting differences in LDO incidence, further studies are needed to verify whether total gastrectomy is a risk factor of S-1–induced LDO.

Regarding cutoff values of tear or plasma concentrations of S-1 ingredients/metabolites, we used a median value of each component because there were no references that could guide us to determine the most appropriate cutoff values. Because we wanted to exclude an unexpected bias derived from arbitrary analyses to determine the cutoff values, we selected the median concentration value of each component as the cutoff. When we separated patients into three groups using different cutoff values with tertiles and conducted univariable analyses, the cutoff values of plasma 5-fluorouracil, plasma CDHP and tear tegafur concentrations also classified patients well into two groups with high or low risks of developing LDO (S6 Fig.). Therefore, the results from these univariable analyses show that, although the most appropriate cutoff points are uncertain, the development of LDO is really affected by the concentrations of S-1 ingredients/metabolites.

In conclusion, our study shows that LDO is a frequent adverse event in patients receiving S-1 chemotherapy and strongly suggests that it is caused by one of the S-1–induced systemic adverse effects rather than by local effects of S-1. Clinical risk factors (older age and decreased renal function) were also identified. Oncologists must be alert to eye symptoms in patients receiving S-1 treatment and cooperate with ophthalmologists to improve the quality of life of patients receiving S-1 therapy. Our study also warrants further investigations of prevention of LDO development or on the treatment strategy to intervene with LDO at an early stage before more complicated surgical procedures are required in the late stage of LDO.

Electronic Supplementary Material

Supplementary materials are available at Cancer Research and Treatment website (http://www.e-crt.org).

crt-2016-569-suppl1.pdf

crt-2016-569-suppl2.pdf

crt-2016-569-suppl3.pdf

crt-2016-569-suppl4.pdf

crt-2016-569-suppl5.pdf

crt-2016-569-suppl6.pdf

NOTES

Conflict of interest relevant to this article was not reported.

Acknowledgements

The study was partly supported by a research grant (03-2013-003) from the Seoul National University Bundang Hospital.

Fig. 1.

CONSORT diagram of the patients in this study.

Fig. 2.

A Kaplan-Meier curve of the cumulative incidence of lacrimal drainage obstruction (LDO) in patients with gastric cancer receiving adjuvant S-1 chemotherapy (n=145). Fifty-three patients (37%) developed LDO, and the cumulative incidences of LDO were 22%, 31%, 36%, and 37% at 3, 6, 9, and 12 months after the initiation of S-1 therapy, respectively.

Fig. 3.

(A-F) Correlations among the concentrations of tear tegafur, plasma tegafur, plasma 5-fluorouracil (5-FU), plasma 5-chloro-2,4-dihydroxypyridine (CDHP), and the creatinine clearance rate.

Fig. 4.

Univariable analysis of risk factors for the development of lacrimal drainage obstruction (LDO). (A) Patients aged ≥ 70 years developed LDO more commonly than those aged < 70 years (long-rank test, p < 0.001). (B) Three groups of patients with different levels of creatinine clearance (Ccr ≥ 80 mL/min, 60 mL/min ≤ Ccr < 80 mL/min, and Ccr < 60 mL/min) showed different incidences of LDO, exhibiting an increased incidence of LDO development with decreased Ccr (log-rank test, p < 0.001). (C) Patients with high 5-fluorouracil (5-FU) concentrations in plasma (≥ 22.3 ng/mL [median]) developed LDO more frequently than those with low plasma 5-FU concentrations (p < 0.001). (D) Patients with high 5-chloro-2,4-dihydroxypyridine (CDHP) concentrations in plasma (≥ 42.0 ng/mL [median]) developed LDO more frequently than those with low plasma CDHP concentrations (p=0.032). (E) There was no difference in the development of LDO between patients with high and low plasma tegafur concentrations (median, 1,835.0 ng/mL; p=0.528). (F) Patients with high tegafur concentrations in tears (≥ 479.2 ng/mL [median]) developed LDO more frequently than those with low tear tegafur concentrations (p=0.006).

Table 1.

Patient characteristics

Clinical characteristic	No. (%)
Age, median (range, yr)	59 (22-82)
Sex
Male	100 (69)
Female	45 (31)
Stage
IB	2 (1)
II	92 (63)
III	51 (35)
Pathology
Well or moderately differentiated adenocarcinoma	60 (41)
Poorly differentiated adenocarcinoma	30 (21)
Signet ring cell carcinoma	45 (31)
Others	10 (7)
Lauren classification
Intestinal type	62 (43)
Diffuse type	72 (50)
Mixed or intermediate type	11 (8)
Primary tumor location
Lower third	73 (50)
Middle third	21 (14)
Upper third	31 (21)
≥ 2/3 of stomach	20 (14)
Gross morphology of primary tumor
Early gastric cancer	21 (14)
Borrmann type I	4 (3)
Borrmann type II	19 (13)
Borrmann type III	91 (63)
Borrmann type IV	10 (7)
Method of gastrectomy
Laparoscopic surgery	114 (79)
Open surgery	31 (21)
Extent of gastrectomy
Total gastrectomy	41 (28)
Distal gastrectomy	99 (68)
Proximal gastrectomy	5 (3)
Creatinine clearance, median (range, mL/min)	79 (41-148)

Adjuvant chemotherapy was conducted in patients with pathologic stages II-III according to the American Joint Committee on Cancer (AJCC, 7th edition). However, two patients who had stage IB with additional risk factors (N2 lymph node metastasis according to the Japanese staging classification) were also included.

Table 2.

Univariable and multivariable analyses of risk factors for the development of lacrimal drainage obstruction

Characteristic	Univariable analysis^a)		Multivariable analysis^a)
Characteristic	1-Year cumulative incidence of LDO (%)	p-value	Hazard ratio	95% Confidence interval	p-value
Sex
Male	41.4	0.207	1.00	-	-
Female	29.8		0.88	0.45-1.70	0.697
Age (yr)
< 70	30.4	< 0.001	1.00	-	-
≥ 70	68.4		1.99	1.00-3.95	0.049
Extent of gastrectomy
Partial gastrectomy	34.6	0.201	1.00	-	-
Total gastrectomy	46.0		1.17	0.60-2.29	0.641
Creatinine clearance (Ccr, mL/min)					0.018
≥ 80	20.0	< 0.001	1.00	-	-
≥ 60 and < 80	52.3		2.52	1.21-5.22	0.013
< 60	63.7		3.21	1.35-7.65	0.008
Plasma 5-fluorouracil concentration (median, 22.3 ng/mL)^b)
< 22.3	22.8	< 0.001	1.00	-	-
≥ 22.3	52.1		2.02	1.03-3.93	0.040
Plasma tegafur concentration (median, 1,835.0 ng/mL)^b)
<1,835.0	34.4	0.528	1.00	-	-
≥ 1,835.0	40.5		0.54	0.29-1.03	0.062
Plasma CDHP concentration (median, 42.0 ng/mL)^b)
< 42.0	30.4	0.032	1.00	-	-
≥ 42.0	45.3		1.22	0.63-2.37	0.559
Tear tegafur concentration (median, 479.2 ng/mL)^b)
< 479.2	26.7	0.006	1.00	-	-
≥ 479.2	50.0		1.85	0.99-3.45	0.055

LDO, lacrimal drainage obstruction; CDHP, 5-chloro-2,4-dihydroxypyridine.

^a) In univariable analysis, a log-rank test was used. In multivariable analysis, the Cox proportional hazard model was used,

^b) Concentrations: ng/mL.

Table 3.

Comparison of the incidences of S-1–related hematologic and non-hematologic toxicities in patients with and without LDO

	Patients without LDO (n=92)	Patients with LDO (n=53)	p-value^a)
Hematologic toxicity
Grade 0 or 1	52 (56.5)	31 (58.5)	0.817
≥ Grade 2	40 (43.5)	22 (41.5)
Non-hematologic toxicity
Grade 0 or 1	37 (40.2)	11 (20.8)	0.016
≥ Grade 2	55 (59.8)	42 (79.2)

Values are presented as number (%). LDO, lacrimal drainage obstruction.

^a) Chi-square test.

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S-1–Induced Lacrimal Drainage Obstruction and Its Association with Ingredients/Metabolites of S-1 in Tears and Plasma: A Prospective Multi-institutional Study

Cancer Res Treat. 2018;50(1):30-39. Published online February 27, 2017

DOI: https://doi.org/10.4143/crt.2016.569

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Abstract
Introduction
Materials and Methods
Results
Discussion
Electronic Supplementary Material
NOTES
REFERENCES

S-1–Induced Lacrimal Drainage Obstruction and Its Association with Ingredients/Metabolites of S-1 in Tears and Plasma: A Prospective Multi-institutional Study

Fig. 1. CONSORT diagram of the patients in this study.

Fig. 2. A Kaplan-Meier curve of the cumulative incidence of lacrimal drainage obstruction (LDO) in patients with gastric cancer receiving adjuvant S-1 chemotherapy (n=145). Fifty-three patients (37%) developed LDO, and the cumulative incidences of LDO were 22%, 31%, 36%, and 37% at 3, 6, 9, and 12 months after the initiation of S-1 therapy, respectively.

Fig. 3. (A-F) Correlations among the concentrations of tear tegafur, plasma tegafur, plasma 5-fluorouracil (5-FU), plasma 5-chloro-2,4-dihydroxypyridine (CDHP), and the creatinine clearance rate.

Fig. 4. Univariable analysis of risk factors for the development of lacrimal drainage obstruction (LDO). (A) Patients aged ≥ 70 years developed LDO more commonly than those aged < 70 years (long-rank test, p < 0.001). (B) Three groups of patients with different levels of creatinine clearance (Ccr ≥ 80 mL/min, 60 mL/min ≤ Ccr < 80 mL/min, and Ccr < 60 mL/min) showed different incidences of LDO, exhibiting an increased incidence of LDO development with decreased Ccr (log-rank test, p < 0.001). (C) Patients with high 5-fluorouracil (5-FU) concentrations in plasma (≥ 22.3 ng/mL [median]) developed LDO more frequently than those with low plasma 5-FU concentrations (p < 0.001). (D) Patients with high 5-chloro-2,4-dihydroxypyridine (CDHP) concentrations in plasma (≥ 42.0 ng/mL [median]) developed LDO more frequently than those with low plasma CDHP concentrations (p=0.032). (E) There was no difference in the development of LDO between patients with high and low plasma tegafur concentrations (median, 1,835.0 ng/mL; p=0.528). (F) Patients with high tegafur concentrations in tears (≥ 479.2 ng/mL [median]) developed LDO more frequently than those with low tear tegafur concentrations (p=0.006).

Fig. 1.

Fig. 2.

Fig. 3.

Fig. 4.

S-1–Induced Lacrimal Drainage Obstruction and Its Association with Ingredients/Metabolites of S-1 in Tears and Plasma: A Prospective Multi-institutional Study

Clinical characteristic	No. (%)
Age, median (range, yr)	59 (22-82)
Sex
Male	100 (69)
Female	45 (31)
Stage
IB	2 (1)
II	92 (63)
III	51 (35)
Pathology
Well or moderately differentiated adenocarcinoma	60 (41)
Poorly differentiated adenocarcinoma	30 (21)
Signet ring cell carcinoma	45 (31)
Others	10 (7)
Lauren classification
Intestinal type	62 (43)
Diffuse type	72 (50)
Mixed or intermediate type	11 (8)
Primary tumor location
Lower third	73 (50)
Middle third	21 (14)
Upper third	31 (21)
≥ 2/3 of stomach	20 (14)
Gross morphology of primary tumor
Early gastric cancer	21 (14)
Borrmann type I	4 (3)
Borrmann type II	19 (13)
Borrmann type III	91 (63)
Borrmann type IV	10 (7)
Method of gastrectomy
Laparoscopic surgery	114 (79)
Open surgery	31 (21)
Extent of gastrectomy
Total gastrectomy	41 (28)
Distal gastrectomy	99 (68)
Proximal gastrectomy	5 (3)
Creatinine clearance, median (range, mL/min)	79 (41-148)

Characteristic	Univariable analysis^a)		Multivariable analysis^a)
Characteristic	1-Year cumulative incidence of LDO (%)	p-value	Hazard ratio	95% Confidence interval	p-value
Sex
Male	41.4	0.207	1.00	-	-
Female	29.8		0.88	0.45-1.70	0.697
Age (yr)
< 70	30.4	< 0.001	1.00	-	-
≥ 70	68.4		1.99	1.00-3.95	0.049
Extent of gastrectomy
Partial gastrectomy	34.6	0.201	1.00	-	-
Total gastrectomy	46.0		1.17	0.60-2.29	0.641
Creatinine clearance (Ccr, mL/min)					0.018
≥ 80	20.0	< 0.001	1.00	-	-
≥ 60 and < 80	52.3		2.52	1.21-5.22	0.013
< 60	63.7		3.21	1.35-7.65	0.008
Plasma 5-fluorouracil concentration (median, 22.3 ng/mL)^b)
< 22.3	22.8	< 0.001	1.00	-	-
≥ 22.3	52.1		2.02	1.03-3.93	0.040
Plasma tegafur concentration (median, 1,835.0 ng/mL)^b)
<1,835.0	34.4	0.528	1.00	-	-
≥ 1,835.0	40.5		0.54	0.29-1.03	0.062
Plasma CDHP concentration (median, 42.0 ng/mL)^b)
< 42.0	30.4	0.032	1.00	-	-
≥ 42.0	45.3		1.22	0.63-2.37	0.559
Tear tegafur concentration (median, 479.2 ng/mL)^b)
< 479.2	26.7	0.006	1.00	-	-
≥ 479.2	50.0		1.85	0.99-3.45	0.055

	Patients without LDO (n=92)	Patients with LDO (n=53)	p-value^a)
Hematologic toxicity
Grade 0 or 1	52 (56.5)	31 (58.5)	0.817
≥ Grade 2	40 (43.5)	22 (41.5)
Non-hematologic toxicity
Grade 0 or 1	37 (40.2)	11 (20.8)	0.016
≥ Grade 2	55 (59.8)	42 (79.2)

Table 1. Patient characteristics

Table 2. Univariable and multivariable analyses of risk factors for the development of lacrimal drainage obstruction

LDO, lacrimal drainage obstruction; CDHP, 5-chloro-2,4-dihydroxypyridine.

In univariable analysis, a log-rank test was used. In multivariable analysis, the Cox proportional hazard model was used,

Concentrations: ng/mL.

Table 3. Comparison of the incidences of S-1–related hematologic and non-hematologic toxicities in patients with and without LDO