The effect of external pituitary irradiation on elevated serum prolactin levels in patients with pituitary macroadenomas.

2.50
Hdl Handle:
http://hdl.handle.net/10541/108809
Title:
The effect of external pituitary irradiation on elevated serum prolactin levels in patients with pituitary macroadenomas.
Authors:
Littley, M D; Shalet, Stephen M; Reid, H; Beardwell, Colin G; Sutton, M L
Abstract:
The response of serum prolactin to external radiotherapy was studied in 58 patients (32 women) with pituitary tumours, aged between 16 and 75 years. Forty-four patients underwent pituitary surgery before radiotherapy. Six patients were irradiated with a regimen of 20 Gy in eight fractions over 10-11 days and the remainder received 35-42.5 Gy in 15 fractions over 20-22 days. Following radiotherapy, 44 patients received additional treatment with dopaminergic agonists. Prolactin levels ranged from 1078 to 491,000 mU/l (median 11,750 mU/l) before radiotherapy and all but three patients showed a fall in serum prolactin (measured 4 weeks after stopping bromocriptine in those on dopamine agonist therapy) during observation over periods of up to 154 months. All patients had evidence of pituitary fossa erosion or expansion at presentation and large tumours (Hardy-Vezina Grade 3-4) were more common in male patients (chi 2 = 10.08, p less than 0.01). The rate of fall of serum prolactin levels was greater in patients with true prolactin-secreting tumours when compared with those who had stalk or hypothalamic damage (p less than 0.005). The rate of decline of serum prolactin was also significantly related to the pre-radiotherapy value (rho = 0.519, p less than 0.01). A serum prolactin level less than 500 mU/l was achieved in 31 out of 44 patients treated with radiotherapy and dopaminergic agonist but only nine remained normoprolactinaemic when medication was discontinued for 4 weeks or more. The serum prolactin level fell permanently to less than 500 mU/l in two of 14 patients treated with radiotherapy only. Actuarial analysis of data from all patients indicated a 50 per cent probability that prolactin would be reduced to less than 500 mU/l by 10 years; this increased to 58 per cent for patients with smaller tumours (Hardy-Vezina grade 2).(ABSTRACT TRUNCATED AT 250 WORDS)
Affiliation:
Department of Endocrinology, Christie Hospital, Withington, Manchester.
Citation:
The effect of external pituitary irradiation on elevated serum prolactin levels in patients with pituitary macroadenomas. 1991, 81 (296):985-98 Q. J. Med.
Journal:
The Quarterly Journal of Medicine
Issue Date:
Dec-1991
URI:
http://hdl.handle.net/10541/108809
DOI:
10.1093/qjmed/81.3.985
PubMed ID:
1808643
Type:
Article
Language:
en
ISSN:
0033-5622
Appears in Collections:
All Christie Publications

Full metadata record

DC FieldValue Language
dc.contributor.authorLittley, M Den
dc.contributor.authorShalet, Stephen Men
dc.contributor.authorReid, Hen
dc.contributor.authorBeardwell, Colin Gen
dc.contributor.authorSutton, M Len
dc.date.accessioned2010-08-02T12:39:52Z-
dc.date.available2010-08-02T12:39:52Z-
dc.date.issued1991-12-
dc.identifier.citationThe effect of external pituitary irradiation on elevated serum prolactin levels in patients with pituitary macroadenomas. 1991, 81 (296):985-98 Q. J. Med.en
dc.identifier.issn0033-5622-
dc.identifier.pmid1808643-
dc.identifier.doi10.1093/qjmed/81.3.985-
dc.identifier.urihttp://hdl.handle.net/10541/108809-
dc.description.abstractThe response of serum prolactin to external radiotherapy was studied in 58 patients (32 women) with pituitary tumours, aged between 16 and 75 years. Forty-four patients underwent pituitary surgery before radiotherapy. Six patients were irradiated with a regimen of 20 Gy in eight fractions over 10-11 days and the remainder received 35-42.5 Gy in 15 fractions over 20-22 days. Following radiotherapy, 44 patients received additional treatment with dopaminergic agonists. Prolactin levels ranged from 1078 to 491,000 mU/l (median 11,750 mU/l) before radiotherapy and all but three patients showed a fall in serum prolactin (measured 4 weeks after stopping bromocriptine in those on dopamine agonist therapy) during observation over periods of up to 154 months. All patients had evidence of pituitary fossa erosion or expansion at presentation and large tumours (Hardy-Vezina Grade 3-4) were more common in male patients (chi 2 = 10.08, p less than 0.01). The rate of fall of serum prolactin levels was greater in patients with true prolactin-secreting tumours when compared with those who had stalk or hypothalamic damage (p less than 0.005). The rate of decline of serum prolactin was also significantly related to the pre-radiotherapy value (rho = 0.519, p less than 0.01). A serum prolactin level less than 500 mU/l was achieved in 31 out of 44 patients treated with radiotherapy and dopaminergic agonist but only nine remained normoprolactinaemic when medication was discontinued for 4 weeks or more. The serum prolactin level fell permanently to less than 500 mU/l in two of 14 patients treated with radiotherapy only. Actuarial analysis of data from all patients indicated a 50 per cent probability that prolactin would be reduced to less than 500 mU/l by 10 years; this increased to 58 per cent for patients with smaller tumours (Hardy-Vezina grade 2).(ABSTRACT TRUNCATED AT 250 WORDS)en
dc.language.isoenen
dc.subjectPituitary Canceren
dc.subject.meshAdenoma-
dc.subject.meshAdolescent-
dc.subject.meshAdult-
dc.subject.meshAged-
dc.subject.meshFemale-
dc.subject.meshHumans-
dc.subject.meshHypophysectomy-
dc.subject.meshMale-
dc.subject.meshMiddle Aged-
dc.subject.meshPituitary Irradiation-
dc.subject.meshPituitary Neoplasms-
dc.subject.meshProlactin-
dc.subject.meshProlactinoma-
dc.titleThe effect of external pituitary irradiation on elevated serum prolactin levels in patients with pituitary macroadenomas.en
dc.typeArticleen
dc.contributor.departmentDepartment of Endocrinology, Christie Hospital, Withington, Manchester.en
dc.identifier.journalThe Quarterly Journal of Medicineen

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