Ageing, exposure to pollution, and interactions between climate change and local seasons as oxidant conditions predicting incident hematologic malignancy at KINSHASA University clinics, Democratic Republic of CONGO (DRC)
Identifieur interne : 000332 ( Pmc/Checkpoint ); précédent : 000331; suivant : 000333Ageing, exposure to pollution, and interactions between climate change and local seasons as oxidant conditions predicting incident hematologic malignancy at KINSHASA University clinics, Democratic Republic of CONGO (DRC)
Auteurs : Mireille Solange Nganga Nkanga ; Benjamin Longo-Mbenza [Afrique du Sud] ; Oladele Vincent Adeniyi [Afrique du Sud] ; Jacques Bikaula Ngwidiwo ; Antoine Lufimbo Katawandja ; Paul Roger Beia Kazadi ; Alain Nganga NzonzilaSource :
- BMC Cancer [ 1471-2407 ] ; 2017.
Abstract
The global burden of hematologic malignancy (HM) is rapidly rising with aging, exposure to polluted environments, and global and local climate variability all being well-established conditions of oxidative stress. However, there is currently no information on the extent and predictors of HM at Kinshasa University Clinics (KUC), DR Congo (DRC). This study evaluated the impact of bio-clinical factors, exposure to polluted environments, and interactions between global climate changes (EL Nino and La Nina) and local climate (dry and rainy seasons) on the incidence of HM.
This hospital-based prospective cohort study was conducted at Kinshasa University Clinics in DR Congo. A total of 105 black African adult patients with anaemia between 2009 and 2016 were included. HM was confirmed by morphological typing according to the French-American-British (FAB) Classification System. Gender, age, exposure to traffic pollution and garages/stations, global climate variability (El Nino and La Nina), and local climate (dry and rainy seasons) were potential independent variables to predict incident HM using Cox regression analysis and Kaplan Meier curves.
Out of the total 105 patients, 63 experienced incident HM, with an incidence rate of 60%. After adjusting for gender, HIV/AIDS, and other bio-clinical factors, the most significant independent predictors of HM were age ≥ 55 years (HR = 2.4; 95% CI 1.4–4.3;
These findings highlight the importance of aging, pollution, the dry season, El Nino and La Nina as related to global warming as determinants of hematologic malignancies among African patients from Kinshasa, DR Congo. Cancer registries in DRC and other African countries will provide more robust database for future researches on haematological malignancies in the region.
Url:
DOI: 10.1186/s12885-017-3547-3
PubMed: 28835214
PubMed Central: 5569529
Affiliations:
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<sourceDesc><biblStruct><analytic><title xml:lang="en" level="a" type="main">Ageing, exposure to pollution, and interactions between climate change and local seasons as oxidant conditions predicting incident hematologic malignancy at KINSHASA University clinics, Democratic Republic of CONGO (DRC)</title>
<author><name sortKey="Nkanga, Mireille Solange Nganga" sort="Nkanga, Mireille Solange Nganga" uniqKey="Nkanga M" first="Mireille Solange Nganga" last="Nkanga">Mireille Solange Nganga Nkanga</name>
<affiliation><nlm:aff id="Aff1">Département de Biologie Médicale, Service de Biologie Clinique, CUK, Faculté de Médecine, Kinshasa, Democratic Republic of Congo</nlm:aff>
<wicri:noCountry code="subfield">Democratic Republic of Congo</wicri:noCountry>
</affiliation>
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<author><name sortKey="Longo Mbenza, Benjamin" sort="Longo Mbenza, Benjamin" uniqKey="Longo Mbenza B" first="Benjamin" last="Longo-Mbenza">Benjamin Longo-Mbenza</name>
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<institution>Faculty of Health Sciences, Walter Sisulu University,</institution>
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Private Bag X1, 5117 Mthatha, South Africa</nlm:aff>
<country xml:lang="fr">Afrique du Sud</country>
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<author><name sortKey="Adeniyi, Oladele Vincent" sort="Adeniyi, Oladele Vincent" uniqKey="Adeniyi O" first="Oladele Vincent" last="Adeniyi">Oladele Vincent Adeniyi</name>
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<wicri:noRegion>East London</wicri:noRegion>
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<author><name sortKey="Ngwidiwo, Jacques Bikaula" sort="Ngwidiwo, Jacques Bikaula" uniqKey="Ngwidiwo J" first="Jacques Bikaula" last="Ngwidiwo">Jacques Bikaula Ngwidiwo</name>
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<wicri:noCountry code="subfield">Democratic Republic of Congo</wicri:noCountry>
</affiliation>
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<author><name sortKey="Katawandja, Antoine Lufimbo" sort="Katawandja, Antoine Lufimbo" uniqKey="Katawandja A" first="Antoine Lufimbo" last="Katawandja">Antoine Lufimbo Katawandja</name>
<affiliation><nlm:aff id="Aff1">Département de Biologie Médicale, Service de Biologie Clinique, CUK, Faculté de Médecine, Kinshasa, Democratic Republic of Congo</nlm:aff>
<wicri:noCountry code="subfield">Democratic Republic of Congo</wicri:noCountry>
</affiliation>
</author>
<author><name sortKey="Kazadi, Paul Roger Beia" sort="Kazadi, Paul Roger Beia" uniqKey="Kazadi P" first="Paul Roger Beia" last="Kazadi">Paul Roger Beia Kazadi</name>
<affiliation><nlm:aff id="Aff2">Centre Hospitalier OVD, Kinshasa, Democratic Republic of Congo</nlm:aff>
<wicri:noCountry code="subfield">Democratic Republic of Congo</wicri:noCountry>
</affiliation>
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<author><name sortKey="Nzonzila, Alain Nganga" sort="Nzonzila, Alain Nganga" uniqKey="Nzonzila A" first="Alain Nganga" last="Nzonzila">Alain Nganga Nzonzila</name>
<affiliation><nlm:aff id="Aff3">Hôpital Saint- Joseph, Kinshasa, Democratic Republic of Congo</nlm:aff>
<wicri:noCountry code="subfield">Democratic Republic of Congo</wicri:noCountry>
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<series><title level="j">BMC Cancer</title>
<idno type="eISSN">1471-2407</idno>
<imprint><date when="2017">2017</date>
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<front><div type="abstract" xml:lang="en"><sec><title>Background</title>
<p id="Par1">The global burden of hematologic malignancy (HM) is rapidly rising with aging, exposure to polluted environments, and global and local climate variability all being well-established conditions of oxidative stress. However, there is currently no information on the extent and predictors of HM at Kinshasa University Clinics (KUC), DR Congo (DRC). This study evaluated the impact of bio-clinical factors, exposure to polluted environments, and interactions between global climate changes (EL Nino and La Nina) and local climate (dry and rainy seasons) on the incidence of HM.</p>
</sec>
<sec><title>Methods</title>
<p id="Par2">This hospital-based prospective cohort study was conducted at Kinshasa University Clinics in DR Congo. A total of 105 black African adult patients with anaemia between 2009 and 2016 were included. HM was confirmed by morphological typing according to the French-American-British (FAB) Classification System. Gender, age, exposure to traffic pollution and garages/stations, global climate variability (El Nino and La Nina), and local climate (dry and rainy seasons) were potential independent variables to predict incident HM using Cox regression analysis and Kaplan Meier curves.</p>
</sec>
<sec><title>Results</title>
<p id="Par3">Out of the total 105 patients, 63 experienced incident HM, with an incidence rate of 60%. After adjusting for gender, HIV/AIDS, and other bio-clinical factors, the most significant independent predictors of HM were age ≥ 55 years (HR = 2.4; 95% CI 1.4–4.3; <italic>P</italic>
= 0.003), exposure to pollution and garages or stations (HR = 4.9; 95% CI 2–12.1; <italic>P</italic>
< 0.001), combined local dry season + La Nina (HR = 4.6; 95%CI 1.8–11.8; <italic>P</italic>
< 0.001), and combined local dry season + El Nino (HR = 4; 95% CI 1.6–9.7; <italic>P</italic>
= 0.004). HM types included acute myeloid leukaemia (28.6% <italic>n</italic>
= 18), multiple myeloma (22.2% <italic>n</italic>
= 14), myelodysplastic syndromes (15.9% <italic>n</italic>
= 10), chronic myeloid leukaemia (15.9% <italic>n</italic>
= 10), chronic lymphoid leukaemia (9.5% <italic>n</italic>
= 6), and acute lymphoid leukaemia (7.9% <italic>n</italic>
= 5). After adjusting for confounders using Cox regression analysis, age ≥ 55 years, exposure to pollution, combined local dry season + La Nina and combined local dry season + El Nino were the most significant predictors of incident hematologic malignancy.</p>
</sec>
<sec><title>Conclusion</title>
<p id="Par4">These findings highlight the importance of aging, pollution, the dry season, El Nino and La Nina as related to global warming as determinants of hematologic malignancies among African patients from Kinshasa, DR Congo. Cancer registries in DRC and other African countries will provide more robust database for future researches on haematological malignancies in the region.</p>
</sec>
</div>
</front>
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<front><journal-meta><journal-id journal-id-type="nlm-ta">BMC Cancer</journal-id>
<journal-id journal-id-type="iso-abbrev">BMC Cancer</journal-id>
<journal-title-group><journal-title>BMC Cancer</journal-title>
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<issn pub-type="epub">1471-2407</issn>
<publisher><publisher-name>BioMed Central</publisher-name>
<publisher-loc>London</publisher-loc>
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<article-meta><article-id pub-id-type="pmid">28835214</article-id>
<article-id pub-id-type="pmc">5569529</article-id>
<article-id pub-id-type="publisher-id">3547</article-id>
<article-id pub-id-type="doi">10.1186/s12885-017-3547-3</article-id>
<article-categories><subj-group subj-group-type="heading"><subject>Research Article</subject>
</subj-group>
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<title-group><article-title>Ageing, exposure to pollution, and interactions between climate change and local seasons as oxidant conditions predicting incident hematologic malignancy at KINSHASA University clinics, Democratic Republic of CONGO (DRC)</article-title>
</title-group>
<contrib-group><contrib contrib-type="author"><name><surname>Nkanga</surname>
<given-names>Mireille Solange Nganga</given-names>
</name>
<address><email>mnganga2002@yahoo.fr</email>
</address>
<xref ref-type="aff" rid="Aff1">1</xref>
</contrib>
<contrib contrib-type="author" corresp="yes"><name><surname>Longo-Mbenza</surname>
<given-names>Benjamin</given-names>
</name>
<address><phone>+27732822843</phone>
<email>longombenza@gmail.com</email>
</address>
<xref ref-type="aff" rid="Aff4">4</xref>
</contrib>
<contrib contrib-type="author" corresp="yes"><name><surname>Adeniyi</surname>
<given-names>Oladele Vincent</given-names>
</name>
<address><phone>+27793110232</phone>
<email>vincoladele@gmail.com</email>
</address>
<xref ref-type="aff" rid="Aff5">5</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Ngwidiwo</surname>
<given-names>Jacques Bikaula</given-names>
</name>
<address><email>jacquesbiks@yahoo.fr</email>
</address>
<xref ref-type="aff" rid="Aff1">1</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Katawandja</surname>
<given-names>Antoine Lufimbo</given-names>
</name>
<address><email>dralkalufimbo@gmail.com</email>
</address>
<xref ref-type="aff" rid="Aff1">1</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Kazadi</surname>
<given-names>Paul Roger Beia</given-names>
</name>
<address><email>santupolo@yahoo.fr</email>
</address>
<xref ref-type="aff" rid="Aff2">2</xref>
</contrib>
<contrib contrib-type="author"><name><surname>Nzonzila</surname>
<given-names>Alain Nganga</given-names>
</name>
<address><email>nganganzonzila2016@gmail.com</email>
</address>
<xref ref-type="aff" rid="Aff3">3</xref>
</contrib>
<aff id="Aff1"><label>1</label>
Département de Biologie Médicale, Service de Biologie Clinique, CUK, Faculté de Médecine, Kinshasa, Democratic Republic of Congo</aff>
<aff id="Aff2"><label>2</label>
Centre Hospitalier OVD, Kinshasa, Democratic Republic of Congo</aff>
<aff id="Aff3"><label>3</label>
Hôpital Saint- Joseph, Kinshasa, Democratic Republic of Congo</aff>
<aff id="Aff4"><label>4</label>
<institution-wrap><institution-id institution-id-type="ISNI">0000 0001 0447 7939</institution-id>
<institution-id institution-id-type="GRID">grid.412870.8</institution-id>
<institution></institution>
<institution>Faculty of Health Sciences, Walter Sisulu University,</institution>
</institution-wrap>
Private Bag X1, 5117 Mthatha, South Africa</aff>
<aff id="Aff5"><label>5</label>
Cecilia Makiwane Hospital/Walter Sisulu University, Faculty of Health Sciences, East London, South Africa</aff>
</contrib-group>
<pub-date pub-type="epub"><day>23</day>
<month>8</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="pmc-release"><day>23</day>
<month>8</month>
<year>2017</year>
</pub-date>
<pub-date pub-type="collection"><year>2017</year>
</pub-date>
<volume>17</volume>
<elocation-id>559</elocation-id>
<history><date date-type="received"><day>19</day>
<month>12</month>
<year>2016</year>
</date>
<date date-type="accepted"><day>14</day>
<month>8</month>
<year>2017</year>
</date>
</history>
<permissions><copyright-statement>© The Author(s). 2017</copyright-statement>
<license license-type="OpenAccess"><license-p><bold>Open Access</bold>
This article is distributed under the terms of the Creative Commons Attribution 4.0 International License (<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/licenses/by/4.0/">http://creativecommons.org/licenses/by/4.0/</ext-link>
), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (<ext-link ext-link-type="uri" xlink:href="http://creativecommons.org/publicdomain/zero/1.0/">http://creativecommons.org/publicdomain/zero/1.0/</ext-link>
) applies to the data made available in this article, unless otherwise stated.</license-p>
</license>
</permissions>
<abstract id="Abs1"><sec><title>Background</title>
<p id="Par1">The global burden of hematologic malignancy (HM) is rapidly rising with aging, exposure to polluted environments, and global and local climate variability all being well-established conditions of oxidative stress. However, there is currently no information on the extent and predictors of HM at Kinshasa University Clinics (KUC), DR Congo (DRC). This study evaluated the impact of bio-clinical factors, exposure to polluted environments, and interactions between global climate changes (EL Nino and La Nina) and local climate (dry and rainy seasons) on the incidence of HM.</p>
</sec>
<sec><title>Methods</title>
<p id="Par2">This hospital-based prospective cohort study was conducted at Kinshasa University Clinics in DR Congo. A total of 105 black African adult patients with anaemia between 2009 and 2016 were included. HM was confirmed by morphological typing according to the French-American-British (FAB) Classification System. Gender, age, exposure to traffic pollution and garages/stations, global climate variability (El Nino and La Nina), and local climate (dry and rainy seasons) were potential independent variables to predict incident HM using Cox regression analysis and Kaplan Meier curves.</p>
</sec>
<sec><title>Results</title>
<p id="Par3">Out of the total 105 patients, 63 experienced incident HM, with an incidence rate of 60%. After adjusting for gender, HIV/AIDS, and other bio-clinical factors, the most significant independent predictors of HM were age ≥ 55 years (HR = 2.4; 95% CI 1.4–4.3; <italic>P</italic>
= 0.003), exposure to pollution and garages or stations (HR = 4.9; 95% CI 2–12.1; <italic>P</italic>
< 0.001), combined local dry season + La Nina (HR = 4.6; 95%CI 1.8–11.8; <italic>P</italic>
< 0.001), and combined local dry season + El Nino (HR = 4; 95% CI 1.6–9.7; <italic>P</italic>
= 0.004). HM types included acute myeloid leukaemia (28.6% <italic>n</italic>
= 18), multiple myeloma (22.2% <italic>n</italic>
= 14), myelodysplastic syndromes (15.9% <italic>n</italic>
= 10), chronic myeloid leukaemia (15.9% <italic>n</italic>
= 10), chronic lymphoid leukaemia (9.5% <italic>n</italic>
= 6), and acute lymphoid leukaemia (7.9% <italic>n</italic>
= 5). After adjusting for confounders using Cox regression analysis, age ≥ 55 years, exposure to pollution, combined local dry season + La Nina and combined local dry season + El Nino were the most significant predictors of incident hematologic malignancy.</p>
</sec>
<sec><title>Conclusion</title>
<p id="Par4">These findings highlight the importance of aging, pollution, the dry season, El Nino and La Nina as related to global warming as determinants of hematologic malignancies among African patients from Kinshasa, DR Congo. Cancer registries in DRC and other African countries will provide more robust database for future researches on haematological malignancies in the region.</p>
</sec>
</abstract>
<kwd-group xml:lang="en"><title>Keywords</title>
<kwd>Environmental epidemiology</kwd>
<kwd>Hematologic malignancies</kwd>
<kwd>Aging</kwd>
<kwd>Central Africa</kwd>
</kwd-group>
<custom-meta-group><custom-meta><meta-name>issue-copyright-statement</meta-name>
<meta-value>© The Author(s) 2017</meta-value>
</custom-meta>
</custom-meta-group>
</article-meta>
</front>
</pmc>
<affiliations><list><country><li>Afrique du Sud</li>
</country>
</list>
<tree><noCountry><name sortKey="Katawandja, Antoine Lufimbo" sort="Katawandja, Antoine Lufimbo" uniqKey="Katawandja A" first="Antoine Lufimbo" last="Katawandja">Antoine Lufimbo Katawandja</name>
<name sortKey="Kazadi, Paul Roger Beia" sort="Kazadi, Paul Roger Beia" uniqKey="Kazadi P" first="Paul Roger Beia" last="Kazadi">Paul Roger Beia Kazadi</name>
<name sortKey="Ngwidiwo, Jacques Bikaula" sort="Ngwidiwo, Jacques Bikaula" uniqKey="Ngwidiwo J" first="Jacques Bikaula" last="Ngwidiwo">Jacques Bikaula Ngwidiwo</name>
<name sortKey="Nkanga, Mireille Solange Nganga" sort="Nkanga, Mireille Solange Nganga" uniqKey="Nkanga M" first="Mireille Solange Nganga" last="Nkanga">Mireille Solange Nganga Nkanga</name>
<name sortKey="Nzonzila, Alain Nganga" sort="Nzonzila, Alain Nganga" uniqKey="Nzonzila A" first="Alain Nganga" last="Nzonzila">Alain Nganga Nzonzila</name>
</noCountry>
<country name="Afrique du Sud"><noRegion><name sortKey="Longo Mbenza, Benjamin" sort="Longo Mbenza, Benjamin" uniqKey="Longo Mbenza B" first="Benjamin" last="Longo-Mbenza">Benjamin Longo-Mbenza</name>
</noRegion>
<name sortKey="Adeniyi, Oladele Vincent" sort="Adeniyi, Oladele Vincent" uniqKey="Adeniyi O" first="Oladele Vincent" last="Adeniyi">Oladele Vincent Adeniyi</name>
</country>
</tree>
</affiliations>
</record>
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