Serveur d'exploration sur les relations entre la France et l'Australie

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Comparison of Clinicopathologic Features and Survival of Histopathologically Amelanotic and Pigmented Melanomas: A Population-Based Study

Identifieur interne : 003B11 ( Main/Exploration ); précédent : 003B10; suivant : 003B12

Comparison of Clinicopathologic Features and Survival of Histopathologically Amelanotic and Pigmented Melanomas: A Population-Based Study

Auteurs : Nancy E. Thomas ; Anne Kricker ; Weston T. Waxweiler ; Patrick M. Dillon ; Klaus J. Busam ; Lynn From ; Pamela A. Groben ; Bruce K. Armstrong ; Hoda Anton-Culver ; Stephen B. Gruber ; Loraine D. Marrett ; Richard P. Gallagher ; Roberto Zanetti ; Stefano Rosso ; Terence Dwyer ; Alison Venn ; Peter A. Kanetsky ; Drs. Irene Orlow ; Susan Paine ; David W. Ollila ; Anne S. Reiner ; Li Luo ; Honglin Hao ; Jill S. Frank ; Colin B. Begg ; Marianne Berwick

Source :

RBID : PMC:4262611

Abstract

Importance

Previous studies have reported that histopathologically amelanotic melanoma is associated with poorer survival than pigmented melanoma; however, small numbers of amelanotic melanomas, selected populations, lack of centralized pathology review, or no adjustment for stage limit interpretation or generalization of results from prior studies.

Objective

To compare melanoma-specific survival between patients with histopathologically amelanotic and those with pigmented melanoma in a large international population-based study.

Design

Survival analysis with median follow-up of 7.6 years.

Setting

The Genes, Environment, and Melanoma study enrolled incident cases of melanoma diagnosed in 1998-2003 from international population-based cancer registries.

Participants

A total of 2,995 patients with 3,486 invasive primary melanomas centrally scored for histologic pigmentation.

Main Outcomes and Measurements

Clinicopathologic predictors and melanoma-specific survival of histologically amelanotic and pigmented melanoma were compared using generalized estimating equations and Cox regression models, respectively.

Results

Eight percent of melanomas (275 of 3,467) were histopathologically amelanotic. Female sex, nodular and unclassified or other histologic subtypes, increased Breslow thickness, presence of mitoses, severe solar elastosis, and lack of a co-existing nevus were independently associated with amelanotic melanoma (each P < .05). Amelanotic melanoma was generally of a higher American Joint Committee on Cancer (AJCC) tumor stage at diagnosis (P for trend <.001) than pigmented melanoma. Hazard of death from melanoma was higher for amelanotic than pigmented melanoma [hazard ratio (HR), 2.0; 95% confidence interval (CI), 1.4-3.0; P< .001], adjusted for age, sex anatomic site, and study design variables; but survival did not differ once AJCC tumor stage was also taken into account, (HR, 0.8; 95% CI, 0.5-1.2; P= .36).

Conclusions and Relevance

At the population level, survival after diagnosis of amelanotic melanoma is poorer than after pigmented melanoma because of its more advanced stage at diagnosis. It is probable that amelanotic melanomas present at more advanced tumor stages because they are difficult to diagnose. The association of amelanotic melanoma with presence of mitoses independently of Breslow thickness and other clinicopathologic characteristics suggests that amelanotic melanomas might also grow faster than pigmented melanomas. New strategies for early diagnosis and investigation of the biology of amelanotic melanoma are warranted.


Url:
DOI: 10.1001/jamadermatol.2014.1348
PubMed: 25162299
PubMed Central: 4262611


Affiliations:


Links toward previous steps (curation, corpus...)


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<div type="abstract" xml:lang="en">
<sec id="S1">
<title>Importance</title>
<p id="P1">Previous studies have reported that histopathologically amelanotic melanoma is associated with poorer survival than pigmented melanoma; however, small numbers of amelanotic melanomas, selected populations, lack of centralized pathology review, or no adjustment for stage limit interpretation or generalization of results from prior studies.</p>
</sec>
<sec id="S2">
<title>Objective</title>
<p id="P2">To compare melanoma-specific survival between patients with histopathologically amelanotic and those with pigmented melanoma in a large international population-based study.</p>
</sec>
<sec id="S3">
<title>Design</title>
<p id="P3">Survival analysis with median follow-up of 7.6 years.</p>
</sec>
<sec id="S4">
<title>Setting</title>
<p id="P4">The Genes, Environment, and Melanoma study enrolled incident cases of melanoma diagnosed in 1998-2003 from international population-based cancer registries.</p>
</sec>
<sec id="S5">
<title>Participants</title>
<p id="P5">A total of 2,995 patients with 3,486 invasive primary melanomas centrally scored for histologic pigmentation.</p>
</sec>
<sec id="S6">
<title>Main Outcomes and Measurements</title>
<p id="P6">Clinicopathologic predictors and melanoma-specific survival of histologically amelanotic and pigmented melanoma were compared using generalized estimating equations and Cox regression models, respectively.</p>
</sec>
<sec id="S7">
<title>Results</title>
<p id="P7">Eight percent of melanomas (275 of 3,467) were histopathologically amelanotic. Female sex, nodular and unclassified or other histologic subtypes, increased Breslow thickness, presence of mitoses, severe solar elastosis, and lack of a co-existing nevus were independently associated with amelanotic melanoma (each
<italic>P</italic>
< .05). Amelanotic melanoma was generally of a higher American Joint Committee on Cancer (AJCC) tumor stage at diagnosis (
<italic>P</italic>
for trend <.001) than pigmented melanoma. Hazard of death from melanoma was higher for amelanotic than pigmented melanoma [hazard ratio (HR), 2.0; 95% confidence interval (CI), 1.4-3.0;
<italic>P</italic>
< .001], adjusted for age, sex anatomic site, and study design variables; but survival did not differ once AJCC tumor stage was also taken into account, (HR, 0.8; 95% CI, 0.5-1.2;
<italic>P</italic>
= .36).</p>
</sec>
<sec id="S8">
<title>Conclusions and Relevance</title>
<p id="P8">At the population level, survival after diagnosis of amelanotic melanoma is poorer than after pigmented melanoma because of its more advanced stage at diagnosis. It is probable that amelanotic melanomas present at more advanced tumor stages because they are difficult to diagnose. The association of amelanotic melanoma with presence of mitoses independently of Breslow thickness and other clinicopathologic characteristics suggests that amelanotic melanomas might also grow faster than pigmented melanomas. New strategies for early diagnosis and investigation of the biology of amelanotic melanoma are warranted.</p>
</sec>
</div>
</front>
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<name sortKey="Gruber, Stephen B" sort="Gruber, Stephen B" uniqKey="Gruber S" first="Stephen B." last="Gruber">Stephen B. Gruber</name>
<name sortKey="Hao, Honglin" sort="Hao, Honglin" uniqKey="Hao H" first="Honglin" last="Hao">Honglin Hao</name>
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<name sortKey="Reiner, Anne S" sort="Reiner, Anne S" uniqKey="Reiner A" first="Anne S." last="Reiner">Anne S. Reiner</name>
<name sortKey="Rosso, Stefano" sort="Rosso, Stefano" uniqKey="Rosso S" first="Stefano" last="Rosso">Stefano Rosso</name>
<name sortKey="Thomas, Nancy E" sort="Thomas, Nancy E" uniqKey="Thomas N" first="Nancy E." last="Thomas">Nancy E. Thomas</name>
<name sortKey="Venn, Alison" sort="Venn, Alison" uniqKey="Venn A" first="Alison" last="Venn">Alison Venn</name>
<name sortKey="Waxweiler, Weston T" sort="Waxweiler, Weston T" uniqKey="Waxweiler W" first="Weston T." last="Waxweiler">Weston T. Waxweiler</name>
<name sortKey="Zanetti, Roberto" sort="Zanetti, Roberto" uniqKey="Zanetti R" first="Roberto" last="Zanetti">Roberto Zanetti</name>
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