CONTEXT: Primary treatment with depot octreotide and lanreotide induces tumor shrinkage in newly diagnosed patients with acromegaly. OBJECTIVE: The objective of the study was to evaluate clinical predictors of tumor shrinkage. DESIGN: This was an analytical, observational, open, prospective study. SUBJECTS: The study included 99 patients: 13 with microadenoma and 86 with macroadenoma (25 enclosed, 32 extrasellar, 29 invasive). MAIN OUTCOME MEASURES: Age, gender, estimated disease duration, body mass index, GH and IGF-I levels, and tumor volume at diagnosis and after 12 months of treatment were measured. Percentage of GH, IGF-I, and tumor size changes from baseline were also analyzed. Tumor changes were scored as absent (+/- 0-25%), mild (+/- 25.1-50%), moderate (+/- 50.1-75%), or notable (75%). INTERVENTIONS: Sixty patients (60.6%) received depot octreotide im (20-30 mg every 28 d), and 39 patients (39.4%) received lanreotide im (60-90 mg every 28 d). RESULTS: Basal tumor volume and maximal tumor diameter correlated with age, disease duration, and GH levels. After 12 months, GH levels were controlled (</=2.5 microg/liter) in 57.6%, IGF-I levels in 45.5%, and both in 42.4%. Shrinkage was absent in 22 patients (22.2%), mild in 31 (31.1%), moderate in 30 (30.3%), and notable in 14 patients (14.1%). Two patients (not responding to treatment) had a mild tumor increase (by 34 and 31.2%, respectively). Basal and posttreatment tumor volumes were highly correlated (r = 0.79, P < 0.0001). At the multistep regression analysis, the percent IGF-I decrease (t = 2.6; P = 0.011) was the best predictor of posttreatment tumor volume, followed by patients' age (t = 2.1; P = 0.042) and percent GH decrease (t = 2.0; P = 0.044). CONCLUSIONS: Most patients with acromegaly (75.5%) had 25% or greater tumor shrinkage after 12 months of primary somatostatin analog therapy: significant increase of tumor mass occurred in only 2.1% of patients (uncontrolled during treatment). Best predictor of tumor shrinkage was posttreatment IGF-I.

Predictors of tumor shrinkage after primary therapy with somatostatin analogs in acromegaly: a prospective study in 99 patients / Colao, Annamaria; Pivonello, Rosario; Auriemma, RENATA SIMONA; Briganti, Francesco; Galdiero, Mariano; Tortora, F.; Caranci, Ferdinando; Cirillo, S.; Lombardi, Gaetano. - In: THE JOURNAL OF CLINICAL ENDOCRINOLOGY AND METABOLISM. - ISSN 0021-972X. - ELETTRONICO. - 91:(2006), pp. 2112-2118. [10.1210/jc.2005-2110]

Predictors of tumor shrinkage after primary therapy with somatostatin analogs in acromegaly: a prospective study in 99 patients

COLAO, ANNAMARIA;PIVONELLO, ROSARIO;AURIEMMA, RENATA SIMONA;BRIGANTI, FRANCESCO;GALDIERO, MARIANO;F. Tortora;CARANCI, FERDINANDO;LOMBARDI, GAETANO
2006

Abstract

CONTEXT: Primary treatment with depot octreotide and lanreotide induces tumor shrinkage in newly diagnosed patients with acromegaly. OBJECTIVE: The objective of the study was to evaluate clinical predictors of tumor shrinkage. DESIGN: This was an analytical, observational, open, prospective study. SUBJECTS: The study included 99 patients: 13 with microadenoma and 86 with macroadenoma (25 enclosed, 32 extrasellar, 29 invasive). MAIN OUTCOME MEASURES: Age, gender, estimated disease duration, body mass index, GH and IGF-I levels, and tumor volume at diagnosis and after 12 months of treatment were measured. Percentage of GH, IGF-I, and tumor size changes from baseline were also analyzed. Tumor changes were scored as absent (+/- 0-25%), mild (+/- 25.1-50%), moderate (+/- 50.1-75%), or notable (75%). INTERVENTIONS: Sixty patients (60.6%) received depot octreotide im (20-30 mg every 28 d), and 39 patients (39.4%) received lanreotide im (60-90 mg every 28 d). RESULTS: Basal tumor volume and maximal tumor diameter correlated with age, disease duration, and GH levels. After 12 months, GH levels were controlled (
2006
Predictors of tumor shrinkage after primary therapy with somatostatin analogs in acromegaly: a prospective study in 99 patients / Colao, Annamaria; Pivonello, Rosario; Auriemma, RENATA SIMONA; Briganti, Francesco; Galdiero, Mariano; Tortora, F.; Caranci, Ferdinando; Cirillo, S.; Lombardi, Gaetano. - In: THE JOURNAL OF CLINICAL ENDOCRINOLOGY AND METABOLISM. - ISSN 0021-972X. - ELETTRONICO. - 91:(2006), pp. 2112-2118. [10.1210/jc.2005-2110]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/203390
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