this is a case study i just completed for my doctoral-level research ethics class.
in-depth case analysis: you are one of the peer reviewers for a prestigious medical journal. you are asked to review a pilot study involving an innovative therapy using embryonic stem cells for treatment of alzheimer’s disease. this is an important piece of research that shows great promise for reversal of this devastating form of dementia. according to your personal belief system, the use of embryonic stem cells is morally reprehensible, even though this practice is now legal in the united states. you do not believe that it is ethical for any researcher to use such humanly derived biological materials, regardless of seemingly beneficial consequences. however, you wish to be fair and impartial. how should you proceed? what are the ethical issues presented in this scenario?
research ethics case analysis
alzheimer’s disease
alzheimer’s disease (ad) affects 4 to 5 percent (%) of older adults in the united states (us). it is the most common type of dementia, and its effects are devastating for both the individual and the extended family unit, as well as being very expensive for society overall. the odds of developing ad double for each five-year period after the age of 65. (eliopoulos, 2010). by age 85, nearly half of elders exhibit some signs and symptoms of this dementia (tabloski, 2006). scientists predict a dramatic increase in the prevalence of ad as the enormous baby boomer cohort, 76 million strong, rapidly approaches retirement age (eliopoulos, 2010). in fact, some authorities project that the economic cost for caring for alzheimer patients will consume the entire federal budget by the year 2030, unless a cure can be found (public broadcasting service [pbs], 2004).
alzheimer’s disease is distinguished by two degenerative pathophysiologic changes in the brain tissue: neuritic plaques and neurofibrillary tangles. the neuritic plaques consist of beta-amyloid fragment byproducts from the breakdown of neurons in the brain. the neurofibrillary tangles occur as a result of dysfunction of tau proteins. these changes first affect the neocortex and hippocampus areas of the brain (eliopoulos, 2010).
stem cells
stem cells are the body’s master cells, with the ability to differentiate into more specialized cell types. they can also renew themselves perpetually through cell division. there are two broad types of stem cells: adult and embryonic (lewis & shaw, 2007; biehl & russell, 2009).
adult stem cells are found in most tissues, as well as in umbilical cord blood. these cells are multipotent, in that they are able to give rise to closely related cells within the same tissue. the function of these cells is tissue maintenance, regeneration, and repair. examples of adult stem cells are skin precursor cells, hematopoietic bone marrow cells, mesenchymal stem cells, and neural stem cells (lewis & shaw, 2007; national institutes of health (nih), 2009b). the use of multipotent stem cells from a person’s own body (autologous) does not require immunosuppressive therapy, which is a great advantage of these types of stem cells. the cells are a perfect immunological match: the person’s unique surface proteins allow these cells to be accepted by the immune system without any host versus graft reaction (biehl & russell, 2009).
embryonic stem cells are derived from the inner cell mass of very early stage human embryos known as blastocysts. human embryos reach the blastocyst stage four to five days after the fertilization of an egg by a sperm, at which time the conceptus consists of 50 to 150 cells, with an inner cell mass of approximately 30 cells (lewis & shaw, 2007; burt et al., 2008; nih, 2009c). these cells are pluripotent, which means they have the unique ability to differentiate into any specific tissue type in the human body (lewis & shaw, 2007).
ethical arguments for and against embryonic stem cell research.
some researchers contend that embryonic stem cells are the preferred stem cell type for medical and research purposes because they are capable of developing into any type of tissue in the body. their versatility means they have the potential to provide replacement tissue to treat a wide variety of disorders, including congenital, developmental, neurological, and degenerative diseases, or catastrophic injuries such as traumatic spinal cord dysfunction resulting in paraplegia or quadriplegia (lewis & shaw, 2007; nih, 2009c). they also proliferate more rapidly, yielding higher numbers of cells than their adult stem cell counterparts (biehl & russell, 2009). embryonic stem cell replacement therapies are especially relevant for diseased and aging organs and tissues that have little capability for self-repair, such as the brain and spinal cord. nerve cells in the central nervous system are very limited in their ability to regenerate following disease or damage. this is why the prognosis is poor with standard medical treatment in the case of neurodegenerative disorders such as alzheimer’s dementia or parkinson’s disease (sumanas, inc., n.d.; tabloski, 2006).
disadvantages of embryonic stem cells include the tendency to form benign proliferative tumors called teratomas and the necessity of immunosuppressive drug therapy for the life of the transplanted cell graft (burt et al., 2008; biehl & russell, 2009).
the stem cell controversy centers on the belief by opponents that a blastocyst is fundamentally a human being in an early stage of development, with rights and interests that need to be protected. it is an indisputable fact that creation of embryonic stem cell lines requires destruction of human life. the inner cell mass containing the stem cells is harvested from the conceptus in a process that disintegrates the developing embryo. critics argue that destroying these tiny human beings is akin to murder. they also assert that research on embryos is a slippery moral slope to be avoided by an ethical society. such practices are akin to cannibalism, an egregious exploitation of living human beings to furnish raw materials for biomedical research and treatments (honig, fitzgerald, & brophy-herb, 2001; guenin, 2005; tollefsen, 2008; national right to life committee [nrlc], 2009). some fear that this type of research could ultimately lead to human cloning, since a process called somatic cell nuclear transfers (scnt) can be used to create bioengeneered human embryos (honig et al., 2001). others propose that adult stem cells should be used instead of embryonic stem cells, as adult stem cell therapy has yielded promising results (coalition of americans for research ethics, 2007; burt et al., 2008; biehl & russell, 2009) such as radical improvement in vision for persons with optic nerve hypoplasia (cbs interactive, 2009).
advocates of unrestricted stem cell research argue that the cells are typically obtained from excess embryos supplied by in vitro fertilization (ivf) processes in fertility clinics. these fertilized eggs would be discarded or cryogenically stored indefinitely anyway; therefore, there is no potential for them to become human beings (honig et al., 2001).
recent developments.
president bush ordered in august 2001 that federal research funding be made available for the first time for embryonic stem cell research, but limited to the estimated 60 lines of cells that were already in existence, since the embryo destruction for those had already taken place. but it would not fund, or in any way encourage, the ongoing destruction of human embryos (svendsen & ebert, 2008; cbs news, 2009). on march 9, 2009, president obama issued an executive order that authorized expanded federal funding for biomedical research for the creation of new stem cell lines (cbs news, 2009; executive order no. 13,505, 2009). new nih draft guidelines released on april 10, 2009, restrict the use of federal funds to research involving left-over embryos from ivf procedures. these guidelines prohibit the use of federal funding for scientific investigations involving embryos created specifically for stem cell research or for human cloning techniques such as scnt (abc news, 2009; nih, 2009a). “nih funding for research using human embryonic stem cells derived from other sources, including somatic cell nuclear transfer, parthenogenesis, and/or ivf embryos created for research purposes, is not allowed under these guidelines” (nih, 2009a, ¶ 3).
statement of the problem
peer review refers to the process of subjecting submitted morificecripts, funding applications, and research projects to the scrutiny of other experts in the same field of study. this screening process is the gate-keeping mechanism by which research or scholarly work is distinguished from other types of information and helps ensure the quality of scientific endeavor. the process encourages authors to meet professional standards and hinders the dissemination of inferior scholarly material, fraudulent claims, and flawed research (geisler, 2000; shamoo & resnik, 2003; justice, 2008). peer reviewers need to possess expertise, as well as scientific objectivity. fairness and impartiality are paramount to effective peer review (shamoo & resnik, 2003). the reviewer featured in the case study faces a conflict of interest in that he or she is biased against embryonic stem cell research due to deep-seated ethical convictions, yet is a member of the peer review panel evaluating the merits of this research. shamoo and resnik (2003) define individual conflict of interests as “personal, financial, or political interests” that obstruct a person’s ability “to meet or fulfill his or her primary professional, ethical, or legal obligations” (p. 141). ethical duties of peer reviewers include confidentiality, respect for intellectual property, impartiality, punctuality, and professional competence (shamoo & resnik, 2003). the reviewer has a professional obligation to be fair and impartial in his or her review of the published study, yet holds a bias that threatens to significantly undermine this objectivity.
what are the options?
a peer reviewer with an apparent or real conflict of interest faces three options. the first strategy is disclosure. the reviewer may simply choose to divulge his or her strong convictions against embryonic stem cell research to relevant parties such as the panel leaders and editors, but continue in the peer review function. alternately, the reviewer may opt for conflict management. this choice takes divulging a step further by the reviewer consulting with other professionals about his or her bias. the last option is avoidance. the reviewer may choose to step down from the peer review role, to remove himself or herself from the situation entirely, since his or her objectivity is called into question (shamoo & resnik, 2003).
bias can significantly impair the peer review process. one negative review may cause an otherwise stellar research proposal or paper to be rejected. the problem of bias can be especially pronounced in the case of controversial research such as studies involving embryonic stem cells (shamoo & resnik, 2003).
what are the relevant considerations?
the ethical considerations are two-fold. first, there is the underlying ethical controversy concerning embryonic stem cell research. secondly, there is the problem of the reviewer bias. the ethics of destroying human embryos for stem cell research weighs the good of the individual against the ultimate good of society (utilitarianism). interested parties include the embryos, the donors, the scientific community, health care professionals, government entities, companies and stockholders who stand to reap enormous dividends from biotechnological breakthroughs involving embryonic stem cell research, and people in society who are suffering from catastrophic conditions and devastating diseases for which traditional science offers no cure. the embryos are living entities who have no voice of their own, but must rely on the advocacy of others to represent their rights and interests. the consequences of this type of research to these tiny individuals is grim – destruction, with no hope of ever developing into a fully formed human being. the consequences to society include exciting possibilities of great advancement in areas of medical treatment such as generating tissues, organs, and body parts. incurable, progressive diseases such as alzheimer’s dementia could be reversed, alleviating untold suffering and saving society billions of health care dollars that would otherwise be spent on custodial care for the tragic victims of this disease. possible deleterious consequences to society would be the eventual ethical slippage into research involving human cloning and fetal tissues, and creating human embryos for the sole purpose of stem cell research. presently, nih guidelines and funds do not support such applications.
which options are best?
in terms of the reviewer, it is in his or her best interest to step down from the peer review panel. making a questionable negative judgment call about the research morificecript might prove injurious to the reviewer’s reputation and career. also, it may damage the group interests (the medical journal or the university with which the reviewer is affiliated), if the reviewer’s bias becomes public knowledge and the researchers call into question the integrity of the peer review process. it is in the researchers’ best interest that the reviewer step down, as they need an expert reviewer who is fair and impartial. finally, the public is being deprived of possible medical breakthroughs in the area of alzheimer’s dementia that may benefit millions of people. therefore, it is also in the best interest of the public at large (all interests) that the reviewer step down. the embryonic stem cell research needs to be evaluated objectively on its own scientific merit and should not be subjected to unwarranted scrutiny as a result of reviewer bias. fairness and impartiality are the key ethical principles here. the right and duty to be impartial trumps the researcher’s personal scruples about the sanctity of life for the embryos.
is this a good solution?
it is this author’s conviction that research involving human embryos is unethical, per the reasons stated earlier. research involving adult stem cells is a reasonable alternative, and it poses no ethical repercussions. regardless of the underlying ethics of embryonic stem cell research, however, the peer review process needs to be fair and impartial. the reviewer with a strong bias, therefore, needs to step down.
biehl, j. k., & russell, b. (2009). introduction to stem cell therapy. journal of cardiovascular nursing, 24(2), 98-103.
burt, r. k., loh, y., pearce, w., beohar, n., barr, w. g., craig, r., et al. (2008). clinical applications of blood-derived and marrow-derived stem cells for nonmalignant diseases. journal of the american medical association, 299, 925-935.
coalition of americans for research ethics. (2007). induced pluripotent stem cells: making embryonic stem cells obsolete. retrieved april 11, 2009, from http://www.stemcellresearch.org/facts/ipscq&a.pdf
eliopoulos, c. (2010). gerontological nursing (7th ed.). philadelphia: lippincott williams & wilkins.
honig, a. s., fitzgerald, h. e., & brophy-herb, h. (eds.). (2001). infancy in america: an encyclopedia. santa barbara, ca: abc-clio.
justice, l. (2008). the peer in peer review. american journal of speech pathology, 17, 106.
lewis, s. h. & shaw, c. a. (2007). genetics, altered immune responses, and transplantation. in s. h. lewis, m. m. heitkemper, s. r. dirksen, p. g. o’brien, & l. bucher (eds.), medical surgical nursing: assessment and management of clinical problems (7th ed., pp. 213-242). st. louis, mo: mosby elsevier.
national institutes of health (nih). (2009a). draft national institutes of health guidelines for human stem cell research. retrieved april 18, 2009, from http://stemcells.nih.gov/policy/2009draft
national right to life committee (nrlc). (2009). obama order opens door to widespread killing of embryonic humans in government-funded research. retrieved april 11, 2009, from http://www.nrlc.org/press_releases_new/release030909.html
svendsen, c. n., & ebert, a. d. (2008). encyclopedia of stem cell research. thousand oaks, ca: sage publications, inc.
tabloski, p. a. (2006). gerontological nursing. upper saddle river, nj: pearson prentice hall.
tollefsen, c. o. (2008). biomedical research and beyond: expanding the ethics of inquiry. new york: routledge taylor and french group.
trounson, a. (2006). the production and directed differentiation of human embryonic stem cells. endocrine review, 27(2), 208-219. retrieved february 22, 2009, from http://edrv.endojournals.org/cgi/reprint/27/2/208
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this is a case study i just completed for my doctoral-level research ethics class.
in-depth case analysis: you are one of the peer reviewers for a prestigious medical journal. you are asked to review a pilot study involving an innovative therapy using embryonic stem cells for treatment of alzheimer’s disease. this is an important piece of research that shows great promise for reversal of this devastating form of dementia. according to your personal belief system, the use of embryonic stem cells is morally reprehensible, even though this practice is now legal in the united states. you do not believe that it is ethical for any researcher to use such humanly derived biological materials, regardless of seemingly beneficial consequences. however, you wish to be fair and impartial. how should you proceed? what are the ethical issues presented in this scenario?
research ethics case analysis
alzheimer’s disease
alzheimer’s disease (ad) affects 4 to 5 percent (%) of older adults in the united states (us). it is the most common type of dementia, and its effects are devastating for both the individual and the extended family unit, as well as being very expensive for society overall. the odds of developing ad double for each five-year period after the age of 65. (eliopoulos, 2010). by age 85, nearly half of elders exhibit some signs and symptoms of this dementia (tabloski, 2006). scientists predict a dramatic increase in the prevalence of ad as the enormous baby boomer cohort, 76 million strong, rapidly approaches retirement age (eliopoulos, 2010). in fact, some authorities project that the economic cost for caring for alzheimer patients will consume the entire federal budget by the year 2030, unless a cure can be found (public broadcasting service [pbs], 2004).
alzheimer’s disease is distinguished by two degenerative pathophysiologic changes in the brain tissue: neuritic plaques and neurofibrillary tangles. the neuritic plaques consist of beta-amyloid fragment byproducts from the breakdown of neurons in the brain. the neurofibrillary tangles occur as a result of dysfunction of tau proteins. these changes first affect the neocortex and hippocampus areas of the brain (eliopoulos, 2010).
stem cells
stem cells are the body’s master cells, with the ability to differentiate into more specialized cell types. they can also renew themselves perpetually through cell division. there are two broad types of stem cells: adult and embryonic (lewis & shaw, 2007; biehl & russell, 2009).
adult stem cells are found in most tissues, as well as in umbilical cord blood. these cells are multipotent, in that they are able to give rise to closely related cells within the same tissue. the function of these cells is tissue maintenance, regeneration, and repair. examples of adult stem cells are skin precursor cells, hematopoietic bone marrow cells, mesenchymal stem cells, and neural stem cells (lewis & shaw, 2007; national institutes of health (nih), 2009b). the use of multipotent stem cells from a person’s own body (autologous) does not require immunosuppressive therapy, which is a great advantage of these types of stem cells. the cells are a perfect immunological match: the person’s unique surface proteins allow these cells to be accepted by the immune system without any host versus graft reaction (biehl & russell, 2009).
embryonic stem cells are derived from the inner cell mass of very early stage human embryos known as blastocysts. human embryos reach the blastocyst stage four to five days after the fertilization of an egg by a sperm, at which time the conceptus consists of 50 to 150 cells, with an inner cell mass of approximately 30 cells (lewis & shaw, 2007; burt et al., 2008; nih, 2009c). these cells are pluripotent, which means they have the unique ability to differentiate into any specific tissue type in the human body (lewis & shaw, 2007).
ethical arguments for and against embryonic stem cell research.
some researchers contend that embryonic stem cells are the preferred stem cell type for medical and research purposes because they are capable of developing into any type of tissue in the body. their versatility means they have the potential to provide replacement tissue to treat a wide variety of disorders, including congenital, developmental, neurological, and degenerative diseases, or catastrophic injuries such as traumatic spinal cord dysfunction resulting in paraplegia or quadriplegia (lewis & shaw, 2007; nih, 2009c). they also proliferate more rapidly, yielding higher numbers of cells than their adult stem cell counterparts (biehl & russell, 2009). embryonic stem cell replacement therapies are especially relevant for diseased and aging organs and tissues that have little capability for self-repair, such as the brain and spinal cord. nerve cells in the central nervous system are very limited in their ability to regenerate following disease or damage. this is why the prognosis is poor with standard medical treatment in the case of neurodegenerative disorders such as alzheimer’s dementia or parkinson’s disease (sumanas, inc., n.d.; tabloski, 2006).
disadvantages of embryonic stem cells include the tendency to form benign proliferative tumors called teratomas and the necessity of immunosuppressive drug therapy for the life of the transplanted cell graft (burt et al., 2008; biehl & russell, 2009).
the stem cell controversy centers on the belief by opponents that a blastocyst is fundamentally a human being in an early stage of development, with rights and interests that need to be protected. it is an indisputable fact that creation of embryonic stem cell lines requires destruction of human life. the inner cell mass containing the stem cells is harvested from the conceptus in a process that disintegrates the developing embryo. critics argue that destroying these tiny human beings is akin to murder. they also assert that research on embryos is a slippery moral slope to be avoided by an ethical society. such practices are akin to cannibalism, an egregious exploitation of living human beings to furnish raw materials for biomedical research and treatments (honig, fitzgerald, & brophy-herb, 2001; guenin, 2005; tollefsen, 2008; national right to life committee [nrlc], 2009). some fear that this type of research could ultimately lead to human cloning, since a process called somatic cell nuclear transfers (scnt) can be used to create bioengeneered human embryos (honig et al., 2001). others propose that adult stem cells should be used instead of embryonic stem cells, as adult stem cell therapy has yielded promising results (coalition of americans for research ethics, 2007; burt et al., 2008; biehl & russell, 2009) such as radical improvement in vision for persons with optic nerve hypoplasia (cbs interactive, 2009).
advocates of unrestricted stem cell research argue that the cells are typically obtained from excess embryos supplied by in vitro fertilization (ivf) processes in fertility clinics. these fertilized eggs would be discarded or cryogenically stored indefinitely anyway; therefore, there is no potential for them to become human beings (honig et al., 2001).
recent developments.
president bush ordered in august 2001 that federal research funding be made available for the first time for embryonic stem cell research, but limited to the estimated 60 lines of cells that were already in existence, since the embryo destruction for those had already taken place. but it would not fund, or in any way encourage, the ongoing destruction of human embryos (svendsen & ebert, 2008; cbs news, 2009). on march 9, 2009, president obama issued an executive order that authorized expanded federal funding for biomedical research for the creation of new stem cell lines (cbs news, 2009; executive order no. 13,505, 2009). new nih draft guidelines released on april 10, 2009, restrict the use of federal funds to research involving left-over embryos from ivf procedures. these guidelines prohibit the use of federal funding for scientific investigations involving embryos created specifically for stem cell research or for human cloning techniques such as scnt (abc news, 2009; nih, 2009a). “nih funding for research using human embryonic stem cells derived from other sources, including somatic cell nuclear transfer, parthenogenesis, and/or ivf embryos created for research purposes, is not allowed under these guidelines” (nih, 2009a, ¶ 3).
statement of the problem
peer review refers to the process of subjecting submitted morificecripts, funding applications, and research projects to the scrutiny of other experts in the same field of study. this screening process is the gate-keeping mechanism by which research or scholarly work is distinguished from other types of information and helps ensure the quality of scientific endeavor. the process encourages authors to meet professional standards and hinders the dissemination of inferior scholarly material, fraudulent claims, and flawed research (geisler, 2000; shamoo & resnik, 2003; justice, 2008). peer reviewers need to possess expertise, as well as scientific objectivity. fairness and impartiality are paramount to effective peer review (shamoo & resnik, 2003). the reviewer featured in the case study faces a conflict of interest in that he or she is biased against embryonic stem cell research due to deep-seated ethical convictions, yet is a member of the peer review panel evaluating the merits of this research. shamoo and resnik (2003) define individual conflict of interests as “personal, financial, or political interests” that obstruct a person’s ability “to meet or fulfill his or her primary professional, ethical, or legal obligations” (p. 141). ethical duties of peer reviewers include confidentiality, respect for intellectual property, impartiality, punctuality, and professional competence (shamoo & resnik, 2003). the reviewer has a professional obligation to be fair and impartial in his or her review of the published study, yet holds a bias that threatens to significantly undermine this objectivity.
what are the options?
a peer reviewer with an apparent or real conflict of interest faces three options. the first strategy is disclosure. the reviewer may simply choose to divulge his or her strong convictions against embryonic stem cell research to relevant parties such as the panel leaders and editors, but continue in the peer review function. alternately, the reviewer may opt for conflict management. this choice takes divulging a step further by the reviewer consulting with other professionals about his or her bias. the last option is avoidance. the reviewer may choose to step down from the peer review role, to remove himself or herself from the situation entirely, since his or her objectivity is called into question (shamoo & resnik, 2003).
bias can significantly impair the peer review process. one negative review may cause an otherwise stellar research proposal or paper to be rejected. the problem of bias can be especially pronounced in the case of controversial research such as studies involving embryonic stem cells (shamoo & resnik, 2003).
what are the relevant considerations?
the ethical considerations are two-fold. first, there is the underlying ethical controversy concerning embryonic stem cell research. secondly, there is the problem of the reviewer bias. the ethics of destroying human embryos for stem cell research weighs the good of the individual against the ultimate good of society (utilitarianism). interested parties include the embryos, the donors, the scientific community, health care professionals, government entities, companies and stockholders who stand to reap enormous dividends from biotechnological breakthroughs involving embryonic stem cell research, and people in society who are suffering from catastrophic conditions and devastating diseases for which traditional science offers no cure. the embryos are living entities who have no voice of their own, but must rely on the advocacy of others to represent their rights and interests. the consequences of this type of research to these tiny individuals is grim – destruction, with no hope of ever developing into a fully formed human being. the consequences to society include exciting possibilities of great advancement in areas of medical treatment such as generating tissues, organs, and body parts. incurable, progressive diseases such as alzheimer’s dementia could be reversed, alleviating untold suffering and saving society billions of health care dollars that would otherwise be spent on custodial care for the tragic victims of this disease. possible deleterious consequences to society would be the eventual ethical slippage into research involving human cloning and fetal tissues, and creating human embryos for the sole purpose of stem cell research. presently, nih guidelines and funds do not support such applications.
which options are best?
in terms of the reviewer, it is in his or her best interest to step down from the peer review panel. making a questionable negative judgment call about the research morificecript might prove injurious to the reviewer’s reputation and career. also, it may damage the group interests (the medical journal or the university with which the reviewer is affiliated), if the reviewer’s bias becomes public knowledge and the researchers call into question the integrity of the peer review process. it is in the researchers’ best interest that the reviewer step down, as they need an expert reviewer who is fair and impartial. finally, the public is being deprived of possible medical breakthroughs in the area of alzheimer’s dementia that may benefit millions of people. therefore, it is also in the best interest of the public at large (all interests) that the reviewer step down. the embryonic stem cell research needs to be evaluated objectively on its own scientific merit and should not be subjected to unwarranted scrutiny as a result of reviewer bias. fairness and impartiality are the key ethical principles here. the right and duty to be impartial trumps the researcher’s personal scruples about the sanctity of life for the embryos.
is this a good solution?
it is this author’s conviction that research involving human embryos is unethical, per the reasons stated earlier. research involving adult stem cells is a reasonable alternative, and it poses no ethical repercussions. regardless of the underlying ethics of embryonic stem cell research, however, the peer review process needs to be fair and impartial. the reviewer with a strong bias, therefore, needs to step down.
references
abc news. (2009). government revises rules on stem cell funding. retrieved april 17, 2009, from http://abcnews.go.com/health/wirestory?id=7363394
biehl, j. k., & russell, b. (2009). introduction to stem cell therapy. journal of cardiovascular nursing, 24(2), 98-103.
burt, r. k., loh, y., pearce, w., beohar, n., barr, w. g., craig, r., et al. (2008). clinical applications of blood-derived and marrow-derived stem cells for nonmalignant diseases. journal of the american medical association, 299, 925-935.
cbs interactive. (2009). chinese stem cell therapy helps girl see. retrieved april 17, 2009, from http://www.cbsnews.com/stories/2009/03/10/national/main4856566.shtml
cbs news. (2009). stem cell debate. retrieved april 17, 2009, from http://www.cbsnews.com/elements/2007/06/20/in_depth_scitech/timeline2956166.shtml
coalition of americans for research ethics. (2007). induced pluripotent stem cells: making embryonic stem cells obsolete. retrieved april 11, 2009, from http://www.stemcellresearch.org/facts/ipscq&a.pdf
eliopoulos, c. (2010). gerontological nursing (7th ed.). philadelphia: lippincott williams & wilkins.
exec. order no. 13,505, 3 c.f.r., 74(46), 10667 (2009). retrieved april 18, 2009, from http://edocket.access.gpo.gov/2009/pdf/e9-5441.pdf
geisler, c. (2000). the metrics of science and technology. westport, ct: quorum books.
guenin, l. (2005). the ethics of human embryonic stem cell research. retrieved march 1, 2009, from http://www.isscr.org/public/ethics.htm
honig, a. s., fitzgerald, h. e., & brophy-herb, h. (eds.). (2001). infancy in america: an encyclopedia. santa barbara, ca: abc-clio.
justice, l. (2008). the peer in peer review. american journal of speech pathology, 17, 106.
lewis, s. h. & shaw, c. a. (2007). genetics, altered immune responses, and transplantation. in s. h. lewis, m. m. heitkemper, s. r. dirksen, p. g. o’brien, & l. bucher (eds.), medical surgical nursing: assessment and management of clinical problems (7th ed., pp. 213-242). st. louis, mo: mosby elsevier.
national institutes of health (nih). (2009a). draft national institutes of health guidelines for human stem cell research. retrieved april 18, 2009, from http://stemcells.nih.gov/policy/2009draft
national institutes of health (nih). (2009b). what are adult stem cells? retrieved april 7, 2009, from http://stemcells.nih.gov/info/basics/basics4.asp
national institutes of health (nih). (2009c). what are embryonic stem cells? retrieved april 7, 2009, from http://stemcells.nih.gov/info/basics/basics3.asp
national right to life committee (nrlc). (2009). obama order opens door to widespread killing of embryonic humans in government-funded research. retrieved april 11, 2009, from http://www.nrlc.org/press_releases_new/release030909.html
public broadcasting service (pbs). (2004). the forgetting: a portrait of alzheimer’s. retrieved february 15, 2009, from http://www.pbs.org/theforgetting/watch/index.html
shamoo, a. e., & resnk, d. b. (2003). responsible conduct of research. new york: oxford university press.
sumanas, inc. (n.d.). human embryonic stem cells. retrieved april 11, 2009, from http://www.sumanasinc.com/scienceinfocus/sif_stemcells.html
svendsen, c. n., & ebert, a. d. (2008). encyclopedia of stem cell research. thousand oaks, ca: sage publications, inc.
tabloski, p. a. (2006). gerontological nursing. upper saddle river, nj: pearson prentice hall.
tollefsen, c. o. (2008). biomedical research and beyond: expanding the ethics of inquiry. new york: routledge taylor and french group.
trounson, a. (2006). the production and directed differentiation of human embryonic stem cells. endocrine review, 27(2), 208-219. retrieved february 22, 2009, from http://edrv.endojournals.org/cgi/reprint/27/2/208