US20110136161A1 - Use of procalcitonin (pct) in risk stratification and prognosis of patients with a primary, non-infectious disease - Google Patents

Use of procalcitonin (pct) in risk stratification and prognosis of patients with a primary, non-infectious disease Download PDF

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US20110136161A1
US20110136161A1 US12/671,702 US67170208A US2011136161A1 US 20110136161 A1 US20110136161 A1 US 20110136161A1 US 67170208 A US67170208 A US 67170208A US 2011136161 A1 US2011136161 A1 US 2011136161A1
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level
fragments
procalcitonin
patient
risk
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Joachim Struck
Andreas Bergmann
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BRAHMS GmbH
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
    • A61K31/00—Medicinal preparations containing organic active ingredients
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/02—Local antiseptics
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61P—SPECIFIC THERAPEUTIC ACTIVITY OF CHEMICAL COMPOUNDS OR MEDICINAL PREPARATIONS
    • A61P31/00—Antiinfectives, i.e. antibiotics, antiseptics, chemotherapeutics
    • A61P31/04—Antibacterial agents
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/68—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving proteins, peptides or amino acids
    • G01N33/6893—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving proteins, peptides or amino acids related to diseases not provided for elsewhere
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
    • G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
    • G01N33/74—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing involving hormones or other non-cytokine intercellular protein regulatory factors such as growth factors, including receptors to hormones and growth factors
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2333/00—Assays involving biological materials from specific organisms or of a specific nature
    • G01N2333/435—Assays involving biological materials from specific organisms or of a specific nature from animals; from humans
    • G01N2333/575—Hormones
    • G01N2333/585—Calcitonins

Definitions

  • Subject of the present invention is the in vitro diagnosis, prognosis and risk stratification of a patient having a primary, non-infectious disease, whereby the level of Procalcitonin (PCT) in a sample of a body fluid of the patient is indicative for the risk of the patient to contract a further disease or medical condition.
  • PCT Procalcitonin
  • PCT Procalcitonin
  • PCT inducible nitric oxide synthase
  • PCT has been used to guide antibiotic therapy (Christ-Crain M et al.: Effect of procalcitonin-guided treatment on antibiotic use and outcome in lower respiratory tract infections: cluster-randomised, single-blinded intervention trial, Lancet, 2004 Feb. 21; 363(9409):600-7): In patients with symptoms of lower respiratory tract infections presenting at the emergency department PCT was measured, and only patients with PCT concentrations >0.25 ng/mL or >0.5 ng/mL were treated with antibiotics, Apparently, this regimen led to a clinical outcome undistinguishable from the control group, in which also many patients with PCT concentrations ⁇ 0.25 ng/mL received antibiotics.
  • the present invention is based on the surprising finding that in samples of patients with a primary, non-infectious disease, slightly elevated procalcitonin (PCT) levels (concentrations) have been detected at a large frequency and are of diagnostic relevance.
  • PCT procalcitonin
  • the inventors have identified a large number of samples having serum levels above 0.03 ng/mL (26.0%) and 0.05 ng/mL (14.7%), respectively, from a total of 4997 samples of patients having a primary, non-infectious disease.
  • Slightly elevated PCT levels relate to PCT levels in the range of from about 0.02 to 0.25 ng/mL, preferably between about 0.02 and 0.1 ng/mL.
  • the presence of slightly elevated PCT levels may be indicative for the risk of a patient having a non-infectious primary disease to acquire a yet clinically unmanifested and/or yet asymptomatic further disease or medical condition.
  • a further disease or medical condition may be related to a local infection or the local infection may facilitate, accelerate and/or enhance the risk of contracting or acquiring the further disease or medical condition.
  • the present invention provides a method for the prognosis of a patient's risk to acquire a further disease or medical condition in addition to an non-infectious primary disease. This also allows for adaption of the treatment of these patients, e.g. by an additional antibiotics therapy which the patient would not have necessarily received if the elevated PCT level had not been detected.
  • the present invention provides an in vitro method for prognosis for a patient having a primary disease not being an infection, the method comprising: determining the level of procalcitonin or fragments thereof of at least 12 amino acids in length, preferably more than 50 amino acids in length, more preferably more than 110 amino acids in length, in a sample obtained from said patient; and correlating said level of procalcitonin or fragments thereof to a risk of the patient to contract a further disease or medical condition which has not yet been manifested and/or is not yet symptomatic.
  • FIG. 1 shows a histogram plot of the frequency of procalcitonin level ranges in patients' samples. These were 4997 unselected samples consecutively sent by physicians of various specialties to a private laboratory for various types of analysis, but not PCT.
  • FIG. 2 shows the distribution of PCT levels above 0.05 ng/mL in relation the medical field of the consulting specialist physician who provided the respective sample. Medians in all groups are indicated.
  • the present invention relates to an in vitro method for prognosis for a patient having a primary disease not being an infection, the method comprising: determining the level of procalcitonin or fragments thereof of at least 12 amino acids in length, preferably more than 50 amino acids in length, more preferably more than 110 amino acids in length, in a sample obtained from said patient; and correlating said level of procalcitonin or fragments thereof to a risk of the patient to contract a further disease or medical condition which has not yet been manifested and/or is not yet symptomatic.
  • Patients in the meaning of the invention are understood to be all persons or animals, irrespective whether or not they exhibit pathological changes, unless stated otherwise.
  • the patient according to the invention is a human.
  • the patient in the context of the present invention has a primary disease not being an infection and the level of procalcitonin or fragments thereof of at least 12 amino acids in length, in serum or plasma samples of said patient is below 0.25 ng/mL.
  • the term “prognosis” denotes a prediction of how a subject's (e.g. a patient's) medical condition will progress. This may include an estimation of the chance of recovery or the chance of an adverse outcome for said subject.
  • fragment refers to smaller proteins or peptides derivable from larger proteins or peptides, which hence comprise a partial sequence of the larger protein or peptide. Said fragments are derivable from the larger proteins or peptides by saponification of one or more of its peptide bonds.
  • Procalcitonin is a 116 amino acids comprising peptide. Smaller variants, such as for instance PCT 3-116 and others, exist as well. Thus the length of procalcitonin fragments is at least 12 amino acids, preferably more than 50 amino acids, more preferably more than 110 amino acids.
  • said risk of contracting a further disease or medical condition is related to an existing bacterial infection, particularly a local infection.
  • a local infection may facilitate, accelerate and/or enhance the risk of contracting or acquiring a further disease or medical condition in a patient having a non-infectious primary disease.
  • said level of procalcitonin or fragments thereof is indicative for a bacterial infection in the patient.
  • said infection is a local infection.
  • a local infection herein relates to all infections being less severe than a sepsis.
  • a sepsis is defined as an infection being associated with the “Systemic Inflammatory Response Syndrome” (“SIRS”) (Levy M M et al. 2001 SCCM/ESICM/ACCP/ATS/SIS International Sepsis Definitions Conference. Crit. Care Med. 2003 April; 31(4):1250-6).
  • SIRS Systemic Inflammatory Response Syndrome
  • the local infection may for example be an infection in the oral cavity, at the teeth or the root of the teeth, infection in wounds, infection in the respiratory tract, or haemorrhoids, or others.
  • Said local infection herein may be treated by administration of an antibiotic.
  • Treatment of the local infection leads to a decreased risk of the patient for acquiring the further disease or medical condition.
  • said bacterial infection is treatable with an antibiotic.
  • the risk of contracting a further disease or medical condition decreases when the patient is treated with an antibiotic.
  • the correlating step of the in vitro method of the present invention preferably comprises comparing said level of procalcitonin or fragments thereof to a threshold level, whereby, when said level of procalcitonin or fragments thereof exceeds said threshold level, said patient is predisposed to said risk.
  • Said threshold level is preferably between 0.02 and 0.25 ng/mL, more preferably between 0.02 and 0.1 ng/mL, even more preferably at about 0.05 (+/ ⁇ 0.01) ng/mL, and most preferably at about 0.03 (+1-0.01) ng/mL. Definition of these threshold levels comes from the analysis of the frequency distribution of PCT level ranges shown in the histogram of appended FIG. 1 and Example 1.
  • said primary disease is not arteriosclerosis. In another embodiment said primary disease is not heart failure. It is in some embodiments of the invention said primary disease is not an acute coronary syndrome. Furthermore, it is in a particular embodiment preferred that said primary disease is not a coronary disease. In a particular embodiment the further disease or medical condition is not selected from the group comprising acute coronary syndrome, heart failure or myocardial infarction.
  • said further disease or medical condition is not an infection, particularly not an infection of the airways and lungs.
  • said primary disease is selected from but not restricted to the group comprising cancer, diabetes, chronic gastrointestinal diseases, chronic renal diseases, hypertension, orthopaedic diseases including osteoporosis, and neurodegenerative diseases including Alzheimer's disease.
  • said further disease or medical condition is selected from the group comprising cardiological diseases selected from but not restricted to the group comprising atherosclerosis, acute coronary syndromes and heart failure.
  • the primary disease herein relates to a disease which is already manifested and/or is already symptomatic.
  • the further disease or medical condition relates to a disease which is not yet manifested and/or is not yet symptomatic.
  • the sample from the patient may for example be selected from the group comprising a blood sample, a serum sample, a plasma sample, and an urine sample or an extract of any of the aforementioned samples.
  • the in vitro method further comprises mathematically combining said level of procalcitonin or fragments thereof with the level of one or more additional prognostic biomarkers, whereby the combination of said level of procalcitonin or fragments thereof with said level of additional prognostic biomarker(s) increases the predictive value of said level of procalcitonin or fragments thereof or the level of said related biomarker for said risk of contracting a further disease or medical condition.
  • an “algorithm” or “mathematical algorithm” refers to the use of a mathematical or statistical method or model used to compare a certain measured value with values of a reference population in order to stratify said measured value.
  • This may for instance be the median of the level of a certain entity in an ensemble of pre-determined samples, which means that the measured level of said entity is compared with the mathematical median of the level of said entity in a given number of samples.
  • the number of samples used to determine the median is not particularly limited, but should be sufficient in order to ensure statistical significance of the median.
  • the number of samples used to determine the median may even increase over the course of time, as the results of further measurement values from clinical samples are added in order to increase the statistic significance of the median.
  • the sample number is chosen such that statistical significance of the median is ensured.
  • said median is used as a reference value, whereby the measured level of the aforementioned entity can be statistically correlated with a certain physiological state, e.g. the propensity of an adverse outcome for a patient, depending on the relative level above or below the median and the extent of deviation of the measured value from said median.
  • other statistical methods such as the determination of quantiles (e.g. quartiles or percentiles) or mathematical models, preferably Cox Regression may be used analogously to the above description in order to obtain the above-mentioned reference value and/or otherwise determine the significance of a measured value with respect to the physiological status of a given subject from which the sample has been obtained.
  • Said mathematical or statistical methods or models are well known to the person skilled in the art and the use thereof in the context of medicinal applications is well established.
  • the “term” biomarker (biological marker) relates to measurable and quantifiable biological parameters (e.g., specific enzyme concentration, specific hormone concentration, specific gene phenotype distribution in a population, presence of biological substances) which serve as indices for health- and physiology-related assessments, such as disease risk, psychiatric disorders, environmental exposure and its effects, disease diagnosis, metabolic processes, substance abuse, pregnancy, cell line development, epidemiologic studies, etc.
  • a biomarker is defined as a characteristic that is objectively measured and evaluated as an indicator of normal biological processes, pathogenic processes, or pharmacologic responses to a therapeutic intervention.
  • a biomarker may be measured on a biosample (as a blood, urine, or tissue test), it may be a recording obtained from a person (blood pressure, ECG, or Holter), or it may be an imaging test (echocardiogram or CT scan) (Vasan et al. 2006, Circulation 113:2335-2362).
  • Biomarkers can indicate a variety of health or disease characteristics, including the level or type of exposure to an environmental factor, genetic susceptibility, genetic responses to exposures, biomarkers of subclinical or clinical disease, or indicators of response to therapy.
  • a simplistic way to think of biomarkers is as indicators of disease trait (risk factor or risk biomarker), disease state (preclinical or clinical), or disease rate (progression).
  • biomarkers can be classified as antecedent biomarkers (identifying the risk of developing an illness), screening biomarkers (screening for subclinical disease), diagnostic biomarkers (recognizing overt disease), staging biomarkers (categorizing disease severity), or prognostic biomarkers (predicting future disease course, including recurrence and response to therapy, and monitoring efficacy of therapy).
  • Biomarkers may also serve as surrogate end points.
  • a surrogate end point is one that can be used as an outcome in clinical trials to evaluate safety and effectiveness of therapies in lieu of measurement of the true outcome of interest.
  • the underlying principle is that alterations in the surrogate end point track closely with changes in the outcome of interest.
  • Surrogate end points have the advantage that they may be gathered in a shorter time frame and with less expense than end points such as morbidity and mortality, which require large clinical trials for evaluation. Additional values of surrogate end points include the fact that they are closer to the exposure/intervention of interest and may be easier to relate causally than more distant clinical events.
  • a biomarker may be a protein, peptide or a nucleic acid molecule.
  • prognostic biomarker(s) is preferably proBNP or fragments thereof in a sample obtained from said patient. More preferably, said fragment of proBNP is NT pro-BNP or BNP.
  • the in vitro method further comprises determining the level of one or more additional prognostic biomarkers in a sample obtained from said patient, and correlating both said level of procalcitonin or fragments thereof and said level of one or more additional prognostic biomarkers to said predisposition to a risk, whereby the combination of said level of procalcitonin or fragments thereof with said level of one or more additional prognostic biomarkers increases the predictive value of said level of procalcitonin or fragments thereof for said risk.
  • the additional prognostic biomarker may for example be selected from a group comprising troponin, myeloperoxidase, CRP, neopterin, GDF-15, ST2, cystatin-C, as well as the following peptides in form of their mature peptides, prohormones (precursors) and associated prohormone fragments: natriuretic peptides, adrenomedullin, endothelins, vasopressin.
  • the correlation between said level of procalcitonin or fragments thereof and said level of one or more additional prognostic biomarkers is conducted with a mathematical algorithm.
  • the present invention relates to the use of an ultrasensitive procalcitonin assay having a lower limit of detection of below about 0.05 ng/mL, preferably below about 0.04 ng/mL, more preferably below about 0.03 ng/mL, most preferably below about 0.02 ng/mL for determining in a patient having a primary disease not being an infection the risk of the patient to contract a further disease or medical condition which has not yet been manifested and/or is not yet symptomatic.
  • the level of procalcitonin or fragments thereof of at least 12 amino acids in length or a mixture of procalicitonin and/or fragments thereof is determined in a sample from said patient. In one embodiment the level of only one fragment is determined. In another embodiment the level of a mixture of procalicitonin and/or fragments thereof is determined.
  • an “assay” or “diagnostic assay” can be of any type applied in the field of diagnostics, including but not restricted to assays methods based on enzymatic reactions, luminescence, fluorescence or radiochemicals.
  • the preferred detection methods comprise rapid tests (point-of-care tests), radioimmunoassays, chemiluminescence- and fluorescence-immunoassays, Immunoblot assays, Enzyme-linked immunoassays (ELISA), Luminex-based bead arrays, and protein microarray assays.
  • the assay types can further be microtitre plate-based, chip-based, bead-based, wherein the biomarkers can be attached to the surface or in solution.
  • the assays can be homogenous or heterogeneous assays, sandwich assays, competitive and non-competitive assays.
  • the assay is in the form of a sandwich assay, which is a noncompetitive immunoassay, wherein the molecule to be detected and/or quantified is bound to a first antibody and to a second antibody.
  • the first antibody may be bound to a solid phase, e.g. a bead, a surface of a well or other container, a chip or a strip
  • the second antibody is an antibody which is labeled, e.g. with a dye, with a radioisotope, or a reactive or catalytically active moiety.
  • the amount of labeled antibody on the site is then measured by an appropriate method.
  • the general composition and procedures involved with “sandwich assays” are well-established and known to the skilled person (The Immunoassay Handbook, Ed. David Wild, Elsevier LTD, Oxford; 3rd ed. (May 2005), ISBN-13: 978-0080445267; Hultsehig C et al., Curr Opin Chem. Biol. 2006 February; 10(1):4-10. PMID: 16376134), incorporated herein by reference.
  • the assay comprises two capture molecules (capture probes), preferably antibodies which are both present as dispersions in a liquid reaction mixture, wherein a first marking component is attached, to the first capture molecule, wherein said first marking component is part of a marking system based on fluorescence- or chemiluminescence-quenching or amplification, and a second marking component of said marking system is attached to the second capture molecule, so that upon binding of both capture molecules to the analyte to be detected, a measurable signal is generated that allows for the detection of the formed sandwich complexes in the solution comprising the sample.
  • capture molecules capture probes
  • a capture probe may be selected from the group comprising a nucleic acid molecule, particularly an aptamer, a carbohydrate molecule, a PNA molecule, a protein, an antibody, a peptide, particularly a cyclic peptide or a glycoprotein.
  • said marking system comprises rare earth cryptates or rare earth chelates in combination with a fluorescence dye or chemiluminescence dye, in particular a dye of the cyanine type.
  • fluorescence based assays comprise the use of dyes, which may for instance be selected from the group comprising FAM (5- or 6-carboxyfluorescein), VIC, NED, Fluorescein, Fluoresceinisothiocyanate (FITC), IRD-700/800, Cyanine dyes, such as CY3, CY5, CY3.5, CY5.5, Cy7, Xanthen, 6-Carboxy-2′,4′,7′,4,7-hexachlorofluorescein (HEX), TET, 6-Carboxy-4′,5′-dichloro-2′,7′-dimethodyfluorescein (JOE), N,N,N′,N′-Tetramethyl-6-carboxyrhodamine (TAMRA), 6-Carboxy-X-rhodamine (ROX), 5-Carboxyrhodamine-60 (R6G5), 6-carboxyrhodamine-6G (RG6), Rhodamine,
  • FAM fluoresc
  • chemiluminescence based assays comprise the use of dyes, based on the physical principles described for chemiluminescent materials in Kirk-Othmer, Encyclopedia of chemical technology, 4 th ed., executive editor, J. L Kroschwitz; editor, M. Howe-Grant, John Wiley & Sons, 1993, vol. 15, p. 518-562, incorporated herein by reference, including citations on pages 551-562.
  • Preferred chemiluminescent dyes are acridiniurn esters.
  • the term “ultrasensitive procalcitonin assay” means that the assay for the detection of procalcitonin or fragments thereof and/or quantification of the level thereof has a lower limit of detection of below about 0.05 ng/mL, preferably below about 0.04 ng/mL, more preferably below about 0.03 ng/mL, most preferably below about 0.02 ng/mL.
  • An ultrasensitive PCT assay is for example the PCT sensitive LIA (Luminescence immuno Assay) Kit (B.R.A.H.M.S AG, Hennigsdorf, Germany, Product No. 109.050).
  • PCT levels in the context of the present invention may for example be determined with an assay as described above, preferably with the PCT sensitive LIA. (Luminescence Immuno Assay) Kit (B.R.A.H.M.S AG, Hennigsdorf, Germany, Product No. 109.050) as in example 1 or following the general procedure described in example 2.
  • an ultrasensitive procalcitonin assay is preferably for stratifying the risk for contracting a further disease or medical in a patient having a primary disease.
  • the ultrasensitive procalcitonin assay may be used for the control of the treatment or prevention of said further disease or medical condition.
  • said treatment or prevention comprises administration of an antibiotic to the patient.
  • the ultrasensitive procalcitonin assay may for example be a sandwich assay comprising two antibodies against different moieties of procalcitonin.
  • one antibody is against the calcitonin moiety of procalcitonin, and the other antibody is a monoclonal antibody against the katacalcin moiety of procalcitonin.
  • the term “calcitonin moiety of procalcitonin” refers to a polypeptide comprising the amino acids 85-116 of pre-procalcitonin.
  • the “katacalcin moiety of procalcitonin” refers to a polypeptide comprising the amino acids 121-141 of pre-procalcitonin.
  • the above amino acid numbers refer to the sequence of human pre-procalcitonin as listed in Protein data bank entry http://www.expasy.ch/uniprot/P01258.
  • amino acid sequences of analogous origin analogous in other species as well as polypeptides with preferably, at least 90%, more preferably at lest 95%, most preferably at least 98% sequence homology to the above-mentioned human polypeptides.
  • the present invention relates to an antibiotic for the use in the treatment of a local infection for the prevention of a further disease or medical condition which has not yet been manifested in a patient having a primary disease, wherein said primary disease is not an infection and wherein the antibiotic is administered when the level of procalcitonin or fragments thereof of at least 12 amino acids in length, in a sample of the patient selected from the group comprising a blood sample, a serum sample and a plasma sample, is between 0.02 and 025 ng/mL, preferably between 0.02 and 0.1 ng/mL.
  • the risk of contracting a further disease or medical condition decreases when the said patient is treated with an antibiotic.
  • the invention relates to an in vitro method for diagnosis of the presence of a bacterial infection in a patient, the method comprising: determining the level of procalcitonin or fragments thereof of at least 12 amino acids in length, in a sample obtained from said patient:
  • the patient has a primary disease not being an infection and the level of procalcitonin or fragments thereof of at least 12 amino acids in length, in serum or plasma samples of said patient is below 0.25 ng/mL.
  • antibiotic in the context of the present invention refers to a chemical substance, which has the capacity to inhibit the growth of or to kill microorganisms.
  • Different antibiotics may have various mechanism of action, e.g. by binding to bacterial ribosomal subunits, thereby inhibiting protein biosynthesis, inhibiting cell wall synthesis, e.g. by inhibiting peptidoglycan synthesis, interacting with the bacterial cytoplasmic membrane, thereby e.g. changing its permeability, inhibit bacterial DNA gyrase or topoisomerase IV enzyme, thereby inhibiting DNA replication and transcription, inhibiting folate synthesis, or inhibiting transcription by binding to RNA polymerase.
  • the antibiotic in the context of the present invention may for example be selected from the group comprising ⁇ -Lactames, glykopeptides, polyketides, aminoglycoside antibiotics, polypeptide antibiotics, chinolones and sulfonamides.
  • the term refers to beta-lactam compounds like penicillines, cephalosporins or carbapenems; tetracyclines; macrolides; fluoroquinolones; sulphonamides; aminoglycosides; imidazoles; peptide-antibiotics and lincosamides.
  • the term relates to amoxicillin, flucloxacillin, penicillin G, ampicillin, methicillin, oxacillin, cefoxitin, ceftriaxone, ceftrizoxime, imipenem, erythromacin, tylosin, tilmicosin, spiramycin, josamycin, azithromycin, clarithromycin, tetracycline, minocycline, doxycycline, lymecycline, norfloxacin, enoxacin, ofloxacin, co-trimoxazole, ciprofloxacin, trimethoprim, gentamicin, amikacin, metronidazole, bactiracin, clindamycin or lincomycin.
  • the term relates to ampicillin, cefotaxime, erythromycin, tetracycline, ciprofloxacin, co-trimoxazole, gentamicin, metronidazole, bacitracin or clindomycin.
  • the assay has been performed according to the manual shipped with the kit, except that the sample volume has been increased form 50 ⁇ L to 100 ⁇ L to increase the functional assay sensitivity (FAS) and to reliably determine the PCT concentrations in the lower concentration range (0.05 to 0.25 ng/mL).
  • FAS functional assay sensitivity
  • the frequencies of the determined PCT levels have been plotted in a histogram (see appended FIG. 1 ). 663% of the sera samples showed PCT levels above 0.017 ng/mL, 26.0% of the sera samples showed PCT concentrations of above 0.03 ng/mL and 14.0% of the sera samples showed PCT levels of above 0.05 ng/mL.
  • the samples having PCT concentrations above 0.05 ng/mL i.e. 702 samples out of 4997 samples
  • This correlation is plotted in appended FIG. 2 .
  • the high number of patients having a primary disease not being an infection but nevertheless having PCT levels above 0.03 ng/mL and 0.05 ng/mL, respectively, is a surprising finding.
  • Procalcitonin can be measured as described (Morgenthaler N G et al.: Clin Chem, 2002 May, 48(5), 788-790). Sheep antibodies were raised against the calcitonin moiety of PCT, and a mouse monoclonal antibody was raised against the katacalcin moiety of PCT. Tubes were coated with the anti-katacalcin antibody. The anti-Calcitonin antibody was labelled with MACN Acridiniumester (InVent GmbH, Hennigsdorf, Germany) and served as tracer, Dilutions of recombinant PCT in normal horse serum served as standards. 100 ⁇ l sample or standard were incubated in the coated tubes for 30 minutes, 200 ⁇ l tracer were added.

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US11241395B2 (en) 2007-08-03 2022-02-08 B.R.A.H.M.S. Gmbh Use of procalcitonin (PCT) in risk stratification and prognosis of patients with a primary, non-infectious disease
US9046532B2 (en) 2009-04-14 2015-06-02 B.R.A.H.M.S Gmbh Risk assessment for antibiotics treatment in patients suffering from primary non-infectious disease by determining the level of procalcitonin
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