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23 New Approaches for the Management of Dry Mouth in Sjögren’s Syndrome in Japan

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Fig. 23.3 Comparison of the increment rate of WSS after 4 weeks of cevimeline treatment. WSS was compared between the pre-treatment and post-treatment points (4 weeks after cevimeline administration) and

the

increment rate was

also

calculated by

dividing

the

post-treatment value

by the

pre-treatment

value. a

ClassiÞcation of the sialography. b ClassiÞcation of the labial minor salivary gland biopsy; box plots represent the median (line), 25th and 75th percentiles (box), and whiskers indicate the tenth and ninetieth percentiles (red dot: Grade 0Ð2, blue dot: Grade 3 and4); P < 0.05, P < 0.01

group (P < 0.001). The increment rate of WSS after cevimeline treatment in the Stage 0 group was signiÞcantly higher than that in the Stage IÐIV group (P = 0.042) (Fig. 23.3a).

23.3.1Labial Minor Salivary Gland Biopsy

Biopsy specimens were obtained through normalappearing lower labial mucosa. Three trained pathologists evaluated the focal lymphocytic sialadenitis in the minor salivary glands by hematoxylin and eosin (HE)-stained section according to GreenspanÕs criteria [16]: Grade 0, absent; Grade 1, slight inÞltrate; Grade 2, moderate inÞltrate or less than one focus per 4 mm2; Grade 3, one focus per 4 mm2; and Grade 4, more than one focus per 4 mm2. Grades 3 and 4 were considered to be positive according to the SS criteria.

23.3.2 Sialography

Sialography of the unilateral parotid gland was performed once before treatment with cevimeline using the conventional hand-injection method. A lateral projection was taken immediately after injection of 1 mL of contrast medium (76%

diatrizoate sodium) (UrograÞn: Nihon Schering Co., Ltd, Osaka, Japan) into the StensenÕs duct. After an addition of 0.5 mL of contrast medium, a posteriorÐanterior radiograph was taken. Two trained examiners evaluated the sialography in all cases according to the classiÞcation of Rubin and Holt [17]: Stage 0, normal; Stage I, punctate; Stage II, globular; Stage III, cavitary; and Stage IV, destructive. Stages IÐIV were considered to be positive according to the SS criteria.

Figure 23.2b shows the pre-treatment and post-treatment WSS in groups classiÞed according to the Þndings of the labial minor salivary gland biopsy. In both the Grade 0Ð2 and the Grade 3 and 4 groups, post-treatment WSS demonstrated a signiÞcant increase compared to the pre-treatment values (P = 0.018 and P = 0.006, respectively). The magnitude of increase of WSS after cevimeline treatment in the Grade 0Ð2 group was signiÞcantly higher than that in the Grade 3 and 4 group (P = 0.001).

Patients with positive sialography Þndings (Stages IÐIV) had a signiÞcantly lower pretreatment WSS and response to cevimeline compared to those with negative Þndings. In contrast, positive Þndings of labial minor salivary gland biopsy were not related to pre-treatment WSS in patients with SjšgrenÕs syndrome. As WSS is contributed principally by the parotid gland [18], this discrepancy might be due to the difference

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