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INTRODUCTION: We report an extremely rare case of acute acalculous cholecystitis on a COVID-19 patient. In our knowledge, this is the first report of laparoscopic cholecystectomy performed on a COVID-19 patient. PRESENTATION OF CASE: A COVID-19 patient was diagnosed with acute acalculous cholecystitis and a multidisciplinary team decided to perform a percutaneous transhepatic biliary drainage (PTBD) as the first treatment. SARS-CoV-2 RNA was not found in the bile fluid. Because of deterioration of the patient's clinical conditions, laparoscopic cholecystectomy had to be performed and since the gallbladder was gangrenous, the severe inflammation made surgery difficult to perform. DISCUSSION: Acalculous cholecystitis was related with mechanical ventilation and prolonged total parenteral nutrition, in this case the gangrenous histopathology pattern and the gallbladder wall ischemia was probably caused by vascular insufficiency secondary to severe acute respiratory distress syndrome of COVID-19 pneumonia. The percutaneous transhepatic gallbladder drainage (PTBD) was performed according to Tokyo Guidelines because of high surgical risk. Laparoscopic cholecystectomy was next performed due to no clinical improvement. The absence of viral RNA in the bile highlights that SARS-CoV-2 is not eliminated with the bile while it probably infects small intestinal enterocytes which is responsible of gastrointestinal symptoms such as anorexia, nausea, vomiting, and diarrhoea. CONCLUSIONS: Although the lack of evidence and guidelines about the management of patient with acute cholecystitis during COVID-19 pandemic, laparoscopic cholecystectomy, at most preceded by PTGBD on high surgical risk patients, remains the gold standard for the treatment of acute cholecystitis on COVID-19 patients.
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Cardiac Implantable Electronic Device (CIED) infections are an emerging clinical issue. There are no national recommendations on the management of these infections, also due to the limited number of dedicated and high quality clinical studies. Therefore, researchers from southern Italian centres have decided to share the clinical experience gathered so far in this field and report practical recommendations for the diagnosis and treatment of adult patients with CIED infection or endocarditis. Here we review the risk factors, diagnostic issues (microbiological and echocardiographic) and aetiology, and describe extensively the best therapeutic approach. We also address the management of complications, follow-up after discharge and the prevention of CIED infections. In this regard, a multidisciplinary approach is fundamental to appropriately manage the initial diagnostic process and the comorbidities, to plan proper antimicrobial treatment and complete percutaneous hardware removal, with the key support of microbiology and echocardiography.
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Antibacterianos/uso terapéutico , Bacteriemia/tratamiento farmacológico , Desfibriladores Implantables , Endocarditis Bacteriana/tratamiento farmacológico , Marcapaso Artificial , Infecciones Relacionadas con Prótesis/tratamiento farmacológico , Infecciones Estafilocócicas/tratamiento farmacológico , Bacteriemia/diagnóstico , Bacteriemia/microbiología , Desfibriladores Implantables/microbiología , Remoción de Dispositivos , Endocarditis Bacteriana/diagnóstico , Endocarditis Bacteriana/microbiología , Estudios de Seguimiento , Humanos , Comunicación Interdisciplinaria , Marcapaso Artificial/microbiología , Guías de Práctica Clínica como Asunto , Infecciones Relacionadas con Prótesis/prevención & control , Factores de Riesgo , Infecciones Estafilocócicas/diagnóstico , Infecciones Estafilocócicas/etiología , Resultado del TratamientoRESUMEN
Frontotemporal lobar degeneration (FTLD) includes different heterogeneous conditions, mainly characterised by personality changes, along with cognitive deficits in language and executive functions. Movement disorders are variably represented. Behavioural disturbances constitute the core feature of FTLD, and eating disorders represent one of the most distinguishing symptoms between FTLD and Alzheimer's disease (AD). The biochemical correlates of such dysfunctions remain to be defined. The adipocyte derived hormone leptin is known to play a foundamental role in food intake and energy balance. To understand whether leptin could be involved in FTLD eating abnormalities, we measured serum leptin levels in 59 patients with FTLD compared with 25 with AD. Serum leptin levels in patients with FTLD were comparable with those in patients with AD. Nevertheless, females with FTLD showed significantly higher leptin levels compared with females with AD. No difference was found between FTDL and AD males or within the spectrum of patients with FTLD. Hyperphagic FTLD females showed higher circulating leptin levels in comparison with those without eating abnormalities; no differences were found between males with FTLD with respect to serum leptin and food intake disturbances. The present study showed a selective gender difference in leptin levels between females with FTLD and AD, which may suggest specific cognitive and behavioural networks need to be investigated.
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Enfermedad de Alzheimer/sangre , Demencia/sangre , Leptina/sangre , Actividades Cotidianas , Anciano , Anciano de 80 o más Años , Demencia/diagnóstico , Femenino , Humanos , Hiperfagia/sangre , Hiperfagia/diagnóstico , Masculino , Escala del Estado Mental , Persona de Mediana Edad , Pruebas Neuropsicológicas , Valores de Referencia , Factores SexualesRESUMEN
Saccharomyces cerevisiae is usually considered non-pathogenic and has rarely been reported as a cause of fungemia in immunocompromised patients, especially those admitted to an intensive care unit or those affected by acquired immune deficiency syndrome or under immunosuppressive treatment. In all described cases the use of probiotic yeast has been given as the main risk factor. We report a case of S. cerevisiae sepsis complicated by pneumonia in a patient affected by alcohol-related cirrhosis with no evidence of probiotic drug intake. In this case recovery was obtained after a treatment course with liposomal amphotericin B. S. cerevisiae should be taken into consideration when sepsis lacks to isolate any aetiological agent.
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Antifúngicos/uso terapéutico , Huésped Inmunocomprometido , Cirrosis Hepática Alcohólica/complicaciones , Enfermedades Pulmonares Fúngicas/complicaciones , Saccharomyces cerevisiae/aislamiento & purificación , Anfotericina B/uso terapéutico , Quimioterapia Combinada , Fluconazol/uso terapéutico , Humanos , Itraconazol/uso terapéutico , Cirrosis Hepática Alcohólica/diagnóstico por imagen , Cirrosis Hepática Alcohólica/tratamiento farmacológico , Cirrosis Hepática Alcohólica/microbiología , Enfermedades Pulmonares Fúngicas/diagnóstico por imagen , Enfermedades Pulmonares Fúngicas/tratamiento farmacológico , Masculino , Persona de Mediana Edad , Pirimidinas/uso terapéutico , Radiografía , Resultado del Tratamiento , Triazoles/uso terapéutico , VoriconazolRESUMEN
Organochlorines are lipophylic molecules that accumulate in the fat where they remain for years. During weight loss, they are mobilized and their concentration increases in blood. The present work tests, in transgenic estrogen-reporter mice (ERE-tK-LUC), whether this increase is sufficient to modulate the estrogen receptors (ERs) in the whole body. Three weak estrogens were studied: p,p'DDT [1,1,1-trichloro2,2-bis(p-chlorophenyl) ethane], p,p'DDE [1,1-dichloro-2,2-bis(p-chlorophenyl)ethylene], and betaBHC [beta-benzene-hexachloride]. Dose-dependent analysis of reporter expression (luciferase) were performed in tissues of acutely treated mice. A body map of ER activation was obtained. All these chemicals modulated the reporter, although with a different efficiency and depending upon the tissue analyzed. Induction was confirmed in the liver by determining the expression of the endogenous progesterone receptor (PR) gene, at the dose and time point at which the luciferase gene was maximally induced. After experimental accumulation in the fat tissue, followed by a 48-h period of fasting, we tested whether these compounds could be mobilized to reach sufficient levels to activate the ERs in selected reproductive and nonreproductive tissues (testicle, prostate, liver, and lung). This experimental setting produced results that were different than those obtained following acute treatments. In loaded mice, fasting induced betaBHC mobilization resulted in strong ER activation in the liver and the lung, which was blocked by ICI-182780. p,p'DDT mobilization had no effect in these tissues, but it acted efficiently in the prostate and testis. betaBHC inhibited the ERE-mediated reporter in the testicle and induced the reporter in the prostate. In this tissue, betaBHC action was not inhibited by the anti-estrogen ICI-182780. During fasting, betaBHC, p,p'DDT, and metabolite p,p'DDE increased in blood concentration, from 2.25 +/- 0.25, 0.51 +/- 0.09, and 0.38 +/- 0.06 microg/ml to 8.24 +/- 0.95, 4.52 +/- 0.68, and 5.06 +/- 0.57 microg/ml, respectively. The effect produced by these organochlorines in the liver correlates with the modulation of the ERalpha protein. We conclude that these organochlorines modulate differently the expression of estrogen-regulated genes in male mice. Their effect is tissue- and compound-specific and is dependent on the energetic balance.
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Estrógenos/genética , Genes Reporteros/genética , Genitales Masculinos/efectos de los fármacos , Hidrocarburos Clorados/toxicidad , Tejido Adiposo/efectos de los fármacos , Tejido Adiposo/metabolismo , Animales , Western Blotting , Línea Celular Tumoral , DDT/metabolismo , DDT/toxicidad , Diclorodifenil Dicloroetileno/metabolismo , Diclorodifenil Dicloroetileno/toxicidad , Estrógenos no Esteroides/toxicidad , Femenino , Cromatografía de Gases y Espectrometría de Masas , Hexaclorociclohexano/metabolismo , Hexaclorociclohexano/toxicidad , Humanos , Hidrocarburos Clorados/farmacocinética , Mediciones Luminiscentes , Masculino , Ratones , Ratones Endogámicos C57BL , Ratones Transgénicos , ARN Mensajero/biosíntesis , ARN Mensajero/genética , Receptores de Estrógenos/genética , Receptores de Progesterona/biosíntesis , Receptores de Progesterona/genética , Reacción en Cadena de la Polimerasa de Transcriptasa Inversa , Distribución TisularRESUMEN
Transient and definitive hypoparathyroidism represent a frequent complication after thyroid surgery. Recently some authors proposed the use of intraoperative parathyroid hormone assay for the rapid detection of this complication. In this paper the authors describe the data obtained from 42 total thyroidectomies with intraoperative measurements of parathyroid hormone. When parathormone decrement was over 75% during thyroidectomy, the hypocalcemic symptomatology was found in all cases during postoperative observation. The authors emphasize intraoperative PTH dosage for immediate identification of patients at risk for postoperative hypoparathyroidism. In this cases parathyroid autotransplantation is suggested to prevent postoperative hypoparathyroidism.
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Hipoparatiroidismo/etiología , Hipoparatiroidismo/prevención & control , Monitoreo Intraoperatorio , Hormona Paratiroidea/sangre , Tiroidectomía/efectos adversos , Adulto , Anciano , Anciano de 80 o más Años , Femenino , Humanos , Hipocalcemia/etiología , Hipocalcemia/prevención & control , Hipoparatiroidismo/sangre , Masculino , Persona de Mediana Edad , Glándulas Paratiroides/trasplante , Hormona Paratiroidea/administración & dosificación , Valor Predictivo de las Pruebas , Pronóstico , Tiroidectomía/métodos , Trasplante AutólogoRESUMEN
Visceral leishmaniasis (VL) has increased as a complicating infection in subjects with human immunodeficiency virus (HIV) in countries bordering the Mediterranean sea. The clinical course as well as organ involvement of VL are often atypical in HIV positive subjects. In this study a case of VL with pulmonary and oral mucose localisation in a patient with acquired immune deficiency syndrome (AIDS), is reported. These findings, together with the presence of the parasite in the peripheral blood smear, confirm that in HIV positive patients the impaired immune system allows the spreading and the atypical localisation of the Leishmania amastigotes more easily than in immuno-competent individuals. In endemic areas and in HIV positive subjects a systemic and careful parasitological follow-up is necessary to ensure that any clinical form of leishmaniasis is not overlooked.
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Síndrome de Inmunodeficiencia Adquirida/complicaciones , Leishmaniasis Visceral/complicaciones , Enfermedades Pulmonares Parasitarias/complicaciones , Úlceras Bucales/complicaciones , Candidiasis/complicaciones , Humanos , Huésped Inmunocomprometido , Masculino , Persona de Mediana Edad , Úlceras Bucales/parasitología , Parasitemia/complicaciones , Parasitemia/parasitología , Sarcoma de Kaposi/complicaciones , Neoplasias Cutáneas/complicacionesRESUMEN
OBJECTIVE: To compare the effectiveness of finasteride and flutamide in the treatment of hirsutism in patients with polycystic ovary syndrome (PCOS) and with idiopathic hirsutism. DESIGN: Randomized study. PATIENTS: One hundred and ten hirsute patients were selected: 64 women with PCOS and 46 with idiopathic hirsutism. METHODS: Patients were assigned randomly to receive 5mg finasteride once daily or 250mg of flutamide twice daily, for 12 consecutive months. Hirsutism was evaluated at 12 months of therapy, with the Ferriman-Gallwey score and with measurement of the terminal hair diameters (microm) taken from four different body areas. Blood samples were taken for assessment of endocrine and hematochemical parameters. Side effects were monitored during the treatment. RESULTS: Both finasteride and flutamide induced a significant decrease in the hirsutism scores and hair diameters at the end of 12 months. Finasteride reduced the Ferriman-Gallwey score by 31.4% in the PCOS cases and by 34.2% in the idiopathic hirsutism cases, and hair diameter by 27.0-34.1% in PCOS and by 29.6-37.9% in idiopathic hirsutism. Flutamide reduced the Ferriman-Gallwey score by 56.7% in PCOS and by 50.9% in idiopathic hirsutism, and hair diameter by 50. 3-60.0% in PCOS and by 47.7-56.5% in idiopathic hirsutism. Flutamide did not induce hormone variations, while finasteride increased testosterone levels by 40% in PCOS and by 60% in idiopathic hirsutism and decreased 3alpha-androstanediol glucuronide (3alpha-diolG) by 66.7% in PCOS and by 69.5% in idiopathic hirsutism. No important side effects or changes in the hematochemical parameters were observed with finasteride, while two patients (3.6%) in the flutamide group expressed abnormal transaminase levels after 6 months of treatment. Dry skin also appeared significantly more with flutamide (67.3%) than with finasteride (23.6%). CONCLUSIONS: Both drugs are effective in the treatment of hirsutism but flutamide is more effective than finasteride.
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Antagonistas de Andrógenos/uso terapéutico , Inhibidores Enzimáticos/uso terapéutico , Finasterida/uso terapéutico , Flutamida/uso terapéutico , Hirsutismo/tratamiento farmacológico , Adolescente , Adulto , Femenino , Hirsutismo/sangre , Hirsutismo/etiología , Hormonas/sangre , Humanos , Síndrome del Ovario Poliquístico/sangre , Síndrome del Ovario Poliquístico/complicacionesRESUMEN
We compared two commercial methods with a time-resolved immunofluorimetric assay for alpha-foetoprotein in human serum using the europium complex of 4,7-bis(chlorosulphophenyl)-1,10-phenanthroline-2,9-dicarboxylic acid as label. The correlation coefficients were r1 = 0.94 and r2 = 0.96.
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Proteínas Sanguíneas/metabolismo , alfa-Fetoproteínas/metabolismo , Anticuerpos/inmunología , Biomarcadores de Tumor/sangre , Síndrome de Down/sangre , Síndrome de Down/diagnóstico , Europio/química , Enfermedades Fetales/sangre , Enfermedades Fetales/diagnóstico , Técnica del Anticuerpo Fluorescente , Fluorometría , Humanos , Modelos Lineales , Diagnóstico Prenatal , Estándares de Referencia , alfa-Fetoproteínas/inmunologíaRESUMEN
The aims of our study were to investigate the effect of the acetylcholinesterase inhibitor pyridostigmine (PD) administration on growth hormone (GH) secretion in acromegaly and to investigate the effects of PD on GH levels following an i.v. infusion of hydrocortisone in acromegaly. We studied five adult patients with active acromegaly, three men and two women with a mean age of 60 +/- 5 years (range 47-71 years) and a mean BMI of 27 +/- 0.7 kg/m2 (range 24-28 kg/m2). All the patients underwent: 1) placebo, 2 tablets po or 2) PD, 120 mg po, at time -60 plus a bolus i.v. injection of 100 mg hydrocortisone succinate in 2 ml saline at time 0 followed by an i.v. infusion of 250 mg hydrocortisone succinate in 250 ml saline from 0 to 120 min, or 3) PD, po or 4) placebo, po at time -60 plus a bolus i.v. injection of 2 ml saline followed by an i.v. infusion of 250 ml saline from 0 to 120 min. Serum GH values did not significantly change after PD administration compared to those during placebo treatment and with respect to baseline levels. In all of the acromegalic patients during hydrocortisone succinate infusion, GH values clearly decreased with respect to basal levels in varying degrees, with a nadir between 90 and 180 minutes after the beginning of hydrocortisone infusion.(ABSTRACT TRUNCATED AT 250 WORDS)
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Acromegalia/sangre , Hidrocortisona/farmacología , Bromuro de Piridostigmina/farmacología , Somatostatina/sangre , Anciano , Estudios Cruzados , Femenino , Humanos , Masculino , Persona de Mediana EdadRESUMEN
We compared two time-resolved fluoroimmunoassay systems for measuring free oestriol in human serum and progesterone in bovine milk. By reading the fluorescence of europium complex of 4,7-bis(chlorosulphophenyl)-1,10-phenanthroline-2,9-dicarboxylic acid in solution, the measuring range is increased for both oestriol (10-50,000 ng/l instead of 25-50,000 ng/l) and for progesterone (10-50,000 ng/l instead of 25-10,000 ng/l). In addition, the interassay coefficients of variation were lowered from 9.5 to 5.7% for oestriol and from 7.5 to 5.4% for progesterone, at the smaller hormone concentrations detectable by each method.
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Estriol/sangre , Fluoroinmunoensayo/métodos , Leche/química , Progesterona/análisis , Animales , Bovinos , Colorantes Fluorescentes , Humanos , Masculino , FenantrolinasRESUMEN
The interaction between biotin and avidin, used in a single-step enzyme-immunoassay for ferritin determination, has been studied. The antigen is simultaneously bound by an antibody coated to a polystyrene bead and by an antibody coupled to biotin which reacts with avidin conjugated to peroxidase. We have assessed the optimal ratio between avidin, conjugated to peroxidase, and biotin, coupled to antibodies, to give rise to the best signal for a quantitative enzyme-immunoassay. We have found that a careful balance between biotinylated antibody and conjugated avidin is necessary for our purpose and a biotinylated antibody excess should be avoided since it causes a signal decrease. This ratio is uninfluenced by both the presence and the absence of the antigen. Thus, an avidin-biotin single-step methodology, which has proved to be reliable for routine use, was developed.
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Avidina/química , Biotina/química , Ensayo de Inmunoadsorción Enzimática , Ferritinas/análisis , Complejo Antígeno-Anticuerpo , Humanos , Nefelometría y Turbidimetría , Poliestirenos/química , Reproducibilidad de los ResultadosRESUMEN
Proteins A and G were each labelled with two different europium chelates (p-isothiocyanatophenyl-ethylenediaminetetraacetic acid and diethylenetriaminepentaacetic acid). Their affinities for IgG from rabbit, goat, horse, sheep, mouse, pig, and rat were then measured using time-resolved fluorescence. Protein G labelled with the second chelate was found to be especially effective in binding to goat and horse IgG.
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Europio , Inmunoglobulina G/análisis , Proteínas del Tejido Nervioso/metabolismo , Proteína Estafilocócica A/metabolismo , Marcadores de Afinidad , Animales , Unión Competitiva , Quelantes , Ácido Edético/análogos & derivados , Fluoroinmunoensayo , Cabras , Caballos , Inmunoglobulina G/metabolismo , Ratones , Ácido Pentético , Conejos , Ratas , Ovinos , Especificidad de la Especie , PorcinosRESUMEN
A radioreceptor assay (RRA) for the determination of total estrogen activity, was set up and used to assess the possible presence of exogenous molecules with estrogen activity in serum; a comparison was made with the specific radioimmunoassay (RIA) for the endogenous estrogen 17-B estradiol (17-B-E2). The assay was first performed on sera from healthy people taking estrogens in the form of oral contraceptives or lotions for local application whose total estrogenic activity in the blood was assumed to be abnormal. The assay was then performed on serum from 98 patients with early breast cancer and 20 patients with metastasis, not undergoing hormone therapy. A higher estrogen activity was found in 2.5% of sera compared to the activity found using the RIA method which is specific for endogenous estrogen 17-B-E2, the RRA/17-B-E2 ratio being higher than 3. Increased estrogen activity was found in 10% serum samples from digoxin treated cardiopathic patients, with an RRA/17-B-E2 ratio ranging from 4.4 to 20. The RRA assay could prove useful for showing up exogenous estrogen activity from various sources (drugs, food) in sera of people in whom estrogen stimulation could be potentially dangerous (i.e. in patients with hormone-sensitive tumors). This exogenous activity could support a certain degree of neoplastic stimulation and, therefore, unfavourably condition the patients' therapeutic response.
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Neoplasias de la Mama/sangre , Estrógenos/sangre , Ensayo de Unión Radioligante/métodos , Biomarcadores de Tumor/sangre , Neoplasias de la Mama/tratamiento farmacológico , Digoxina/sangre , Digoxina/uso terapéutico , Estradiol/sangre , Estudios de Evaluación como Asunto , Femenino , Cardiopatías/sangre , Cardiopatías/tratamiento farmacológico , Humanos , Radioinmunoensayo/métodos , Tamoxifeno/sangre , Tamoxifeno/uso terapéuticoRESUMEN
Murine monoclonal antibodies were elicited by the recombinant human H-ferritin overexpressed in Escherichia coli. They had a specificity analogous to that of the antibodies elicited by natural human H-chain, and all of them showed low additivity in binding the recombinant ferritin. Four antibodies of each group were challenged with four H-ferritin mutants overexpressed in E. coli, altered in different accessible areas of the molecule. They consisted of deletions of the first 13 and last 22 amino acids, a duplication of an 18 amino acid sequence in the loop region, and a substitution of a 5 amino acid stretch in the three-fold symmetry axis region. Double diffusion, immunodot analyses and inhibition plots indicated that: (1) all the mutants were recognized by at least one antibody; (2) the deletion of the N-terminus and the duplication in the loop region had the strongest effect on antibody binding; and (3) epitope boundaries of the various antibodies could not be recognized. The antibodies were tested with H-containing ferritins from rat and hen hearts, and showed low or absent reactivities despite their high structural homology with human ferritin. Comparison of the amino acid sequences of human, mouse, rat and hen H-chains, together with mutational data, suggested that; (i) ferritin epitopes are large, probably encompassing a large portion of the subunit surface and (ii) Thr-5 and Cys-90 have a role in H-ferritin immunogenicity.
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Epítopos/análisis , Ferritinas/genética , Mutación , Secuencia de Aminoácidos , Animales , Anticuerpos Monoclonales , Complejo Antígeno-Anticuerpo/análisis , Pollos , Epítopos/genética , Escherichia coli/genética , Ferritinas/inmunología , Ferritinas/aislamiento & purificación , Humanos , Hígado/metabolismo , Sustancias Macromoleculares , Modelos Moleculares , Datos de Secuencia Molecular , Miocardio/metabolismo , Ratas , Proteínas Recombinantes/inmunología , Homología de Secuencia de Ácido NucleicoRESUMEN
A library of 27 murine monoclonal antibodies was obtained by using human liver and heart ferritins as immunogens. The specificity of the antibodies for the two ferritins and their subunits was studied with five different methods. The antibodies elicited by the liver ferritin bound preferentially the immunogen and were specific for the L subunit. Some antibodies elicited by the heart ferritin had characteristics similar to the anti-liver antibodies, other ones bound preferentially the heart over the liver ferritin and were specific for the H subunit. Only two antibodies were able to bind both ferritins and subunits. Some anti-H and anti-L chain antibodies were used to develop and compare four types of immunoassay to quantitate isoferritins. The results indicate that heart ferritin is immunologically more heterogeneous than liver, the H and L subunits having large immunological differences with few, if any, identical epitopes; and that that the architecture of the immunoassays have a strong influence on the crossreactivity of the antibodies with the two isoferritins, probably because H and L chains are not arranged randomly in the assembled protein.
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Anticuerpos Monoclonales , Ferritinas/análisis , Hígado/análisis , Miocardio/análisis , Animales , Unión Competitiva , Caballos , Humanos , Inmunodifusión , Técnicas de Inmunoadsorción , Sustancias Macromoleculares , Bazo/análisisRESUMEN
Serum ferritin has been suggested as a tumor marker in the diagnosis of certain malignancies and for following the activity or dissemination of the malignant process. Since neoplastic tissues generally contain more acidic isoferritins than their normal tissue counterparts, it has also been suggested that the specific assay of such isoferritins in serum may be of particular value in the diagnosis of malignancy. In this work, we have evaluated ferritin concentration in the serum of normal subjects and patients with acute nonlymphocytic leukemia, Hodgkin's disease, breast cancer and lung cancer by simultaneously using three different immunoassays: an immunoradiometric assay based on polyclonal antibodies against human liver (basic, L-subunit rich) ferritin, a radioimmunoassay based on polyclonad antibodies against HeLa cell (acidic, H-subunit rich) ferritin, and an immunoradiometric assay based on the monoclonal antibody 2A4 raised against human heart (acidic, H-subunit rich) ferritin. Most of the patients studied had increased values for liver-type ferritin in the absence of increased iron stores. Binding of serum ferritin to concanavalin A did not prove to be useful in distinguishing a tumor-specific basic isoferritin. The HeLa ferritin assay was found to be less specific than the heart ferritin assay in the detection of acidic isoferritins, and did not provide any advantage over the liver assay in detecting the increased levels of serum ferritin associated with malignant disease. Heart-type ferritin was found in one-fifth of normal sera and 64% of sera from patients with malignancy. Values were very low compared with those for basic ferritin, ranging from less than 0.1 to 17% of total serum ferritin (geometric mean value 1.3%) in patients with malignancy. These findings indicate that at present there is little application for serum ferritin immunoassays based on antibodies to HeLa cell or heart ferritin in the diagnosis or monitoring of malignant disease. This seems to be due to the presence in human serum of biding factors which are responsible for the rapid clearance of acidic isoferritins from the circulation. The serum concentration of basic ferritin, however, can be useful in the diagnosis and management of some malignancies, and it is possible that studies on cell isoferritins can be important in biologic monitoring of neoplastic disorders. It should also be noted that the increased levels of serum ferritin found in patients with malignancy can exert adverse effects on the host immune response and perhaps an inhibitory effect on hematopoiesis.