Effectiveness of Slow-Release Lanreotide in Previously Operated and Untreated Patients with GH-Secreting Pituitary Macroadenoma

The aim of this study was to verify whether treatment with slow-release lanreotide (SRL) before surgery is useful in the management of patients with GH-secreting pituitary macroadenoma. Twenty untreated acromegalics were enrolled randomly in two groups. Ten patients (group 1: 2 males and 8 females aged 44.5 ± 4.3 years) underwent surgery via transsphenoidal access. Only one of them was cured by surgery, whereas the other nine were treated with SRL. In the other ten patients (group 2: 3 males and 7 females aged 43.2 ± 12.3 years), transsphenoidal surgery followed SRL treatment. Surgery induced the normalization of GH and IGF-1 levels in four group 2 patients - three of them had shown an evident shrinkage of the tumor after SRL treatment. After surgery, group 1 showed a significant decrease of mean IGF-1 (580 ± 63 vs. 789 ± 64 ng/ml, p < 0.02), but not of GH values (26.1 ± 9.8 vs. 44.8 ± 19.3 ng/ml, NS); the cured patient was excluded from the following evaluations. Group 2 showed an evident, but not significant, decrease of both GH and IGF-1 values compared to values measured at the end of medical treatment (GH: 22.4 ± 9.7 vs. 7.7 ± 4.7 ng/ml, NS. IGF-1: 570 ± 69 vs. 402 ± 58 ng/ml, NS). Gonadal, thyroid and adrenal impairment was evident in six, four and no patients in group 1 and in three, two and one patients in group 2, respectively. SRL 30 mg was administered every 14 days for three months and then every 10 days until the 6th month. Before SRL treatment, mean GH and IGF-1 levels did not differ significantly in group 1 vs. group 2 (GH: 29.3 ± 10.5 vs. 43.4 ± 22.0 ng/ml; IGF-1: 633 ± 38 vs. 778 ± 83 ng/ml). In group 1, a significant decrease of serum GH, but not of IGF-1 levels, was achieved at the end of 1st trimester of SRL (GH: 17.6 ± 5.4 ng/ml, p < 0.05. IGF-1: 540 ± 48 ng/ml, NS), whereas a significant decrease in both GH and IGF-1 values was evident during the 2nd trimester (GH: 6.1 ± 3.0 ng/ml, p < 0.05. IGF-1: 433 ± 74 ng/ml, p < 0.02). Serum GH levels, measured during the 2nd trimester of SRL therapy, were also significantly lower than levels measured at the end of the 1st trimester (p < 0.05). Group 2 serum GH and IGF-1 levels were not significantly decreased at the end of the 1st trimester (GH: 27.2 ± 12.1 ng/ml, NS. IGF-1: 698 ± 74 ng/ml, NS), whereas only serum IGF-1 (570 ± 69 ng/ml, p < 0.05) was significantly reduced during the 2nd trimester of SRL (GH: 22.4 ± 9.7 ng/ml, NS). Serum GH and IGF-I fell in the normal range in 4 patients in group 1 and one in group 2 at the end of the second trimester of SRL therapy. Independently of the trial applied, the mean clinical score level ameliorated significantly in both groups (group 1: p < 0.0005; group 2: p < 0.0001). In both groups, the proportion of patients complaining of headache and tissue swelling and the score level of headache, tissue swelling and excessive sweating decreased significantly. In group 1 the score level of fatigue and arthralgia also decreased significantly. In conclusion, this study proves that in patients with GH-secreting pituitary macroadenoma: (i) surgery followed by SRL induces a better clinical and biochemical status than SRL alone; (ii) SRL treatment before surgery ameliorates the clinical and biochemical outcome and reduces the prevalence of hypopituitarism due to surgery.

Key words:

Acromegaly - Growth Hormone - Somatostatin Analogs

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