Organ transplantation
In 1954, a young man named Richard Herrick lay on an operating table at Brigham & Women's Hospital in Boston. He suffered from acute renal failure and faced certain death without intervention. His identical twin brother Ronald agreed to donate one of his kidneys. The surgeon performing the operation was Dr. Joseph Murray. This specific case marked the first successful kidney transplant between living related donors. Before this moment, no human recipient had survived more than thirty days after receiving an organ from another person. The success of this surgery relied entirely on the genetic identity between the two brothers. Because they were twins, their immune systems did not recognize the new kidney as foreign tissue. Consequently, there was no need for anti-rejection medications, which were unknown at that time. Richard Herrick lived for eight years following the procedure. This event proved that transplantation could work if the biological match was perfect.
British scientist Peter Medawar worked at the National Institute for Medical Research during the late 1940s. He identified the specific immune reactions that caused transplanted organs to fail within weeks or months. In 1951, he suggested that immunosuppressive drugs might solve this problem. Cortisone was discovered shortly before this period, but it offered limited protection. Azathioprine became available in 1959, yet it still failed to ensure long-term survival for most patients. A breakthrough arrived in 1970 with the discovery of cyclosporine. This drug allowed surgeons to manage rejection effectively and transformed transplantation from experimental research into a life-saving treatment. By 1984, two-thirds of heart transplant patients survived five years or more. The development of these drugs changed the landscape of modern medicine forever. Without them, the complex surgeries performed today would remain impossible.
Christiaan Barnard stood in Cape Town, South Africa on the 3rd of December 1967. He prepared to perform the world's first human-to-human heart transplant. His patient was Louis Washkansky, a man suffering from severe heart disease. The operation took place under intense media scrutiny that many described as a distasteful publicity circus. Washkansky survived for eighteen days before dying of pneumonia. Despite his short life, the procedure sparked over one hundred transplants globally during 1968 and 1969. Almost all those early recipients died within sixty days. Barnard's second patient, Philip Blaiberg, lived for nineteen months. This case demonstrated that success was possible if the timing and medical care were precise. The media attention brought both hope and ethical controversy to the field. It forced society to confront questions about the value of life and the risks of surgery.
In the United States, nearly 35,000 organ transplants occurred in 2017 alone. Yet approximately 115,000 Americans remained on waiting lists at that time. Only 18 percent of these procedures came from living donors who gave a kidney or part of their liver. Global analyses indicate that available transplants meet only a minority of worldwide need. The Transplant Observatory reports substantial gaps between demand and supply year after year. In China, more than two million people require organ transplants while data remains incomplete elsewhere. Latin America has approximately 50,000 individuals on waiting lists with ninety percent awaiting kidneys. Thousands more await transplantation across Africa despite less comprehensive data. These shortages create desperate situations where patients die before receiving an organ. The disparity between availability and need drives many to seek alternatives abroad.
In Pakistan, forty percent to fifty percent of residents in some villages possess only one kidney. They sold the other for a transplant into a wealthy person likely from another country. Dr. Farhat Moazam stated this fact at a World Health Organization conference. Pakistani donors received about $2,500 but kept only half because middlemen took the rest. In Chennai, India, poor fishermen and families sold kidneys after the Indian Ocean tsunami destroyed their livelihoods on the 26th of December 2004. About 100 mostly women sold kidneys for amounts ranging from 40,000 to 60,000 rupees. Thilakavathy Agatheesh, aged thirty, said she could no longer work due to post-surgery stomach cramps. Most sellers later called it a mistake. In Cyprus, police closed the Petra Clinic in 2010 under charges of trafficking human eggs. Women from Ukraine and Russia were brought there for harvesting and sale to foreign fertility tourists. These illegal markets often leave donors without adequate care and expose recipients to dangerous infections like HIV or Hepatitis C.
The United States created the Organ Procurement and Transplantation Network through the Organ Transplant Act of 1984. This network allocates organs according to methodologies deemed most equitable by experts. The Scientific Registry of Transplant Recipients supports continuous research on outcomes. In 2003, a case at Duke University raised ethical concerns when a teenage girl received priority for a second transplant despite being physically unfit. She had initially received an incompatible heart-lung transplant due to a critical error. The case highlighted tensions between fairness and public pressure. In contrast, countries like the United Kingdom allocate organs based solely on medical criteria and waiting list position. No allowance exists for directed donation outside immediate family except in exceptional circumstances. Spain maintains the highest worldwide donor rate with over 35 donors per million population annually. These systems attempt to balance scarcity with equity while preventing exploitation.
Common questions
When did the first successful kidney transplant between living related donors take place?
The first successful kidney transplant between living related donors took place in 1954. Richard Herrick received a kidney from his identical twin brother Ronald at Brigham & Women's Hospital in Boston under the care of Dr. Joseph Murray.
What year was cyclosporine discovered and how did it change organ transplantation?
Cyclosporine was discovered in 1970 to allow surgeons to manage rejection effectively. This drug transformed transplantation from experimental research into a life-saving treatment by enabling long-term survival for recipients who previously would have died within weeks or months.
Who performed the world's first human-to-human heart transplant and when did it occur?
Christiaan Barnard performed the world's first human-to-human heart transplant on the 3rd of December 1967 in Cape Town, South Africa. His patient Louis Washkansky survived for eighteen days before dying of pneumonia despite the procedure sparking over one hundred transplants globally during 1968 and 1969.
How many organ transplants occurred in the United States in 2017 compared to waiting lists?
Nearly 35,000 organ transplants occurred in the United States in 2017 alone while approximately 115,000 Americans remained on waiting lists at that time. Only 18 percent of these procedures came from living donors who gave a kidney or part of their liver.
What illegal organ trafficking activities were reported in Pakistan and India around 2004?
In Pakistan forty percent to fifty percent of residents in some villages sold kidneys for about $2,500 with middlemen taking half the profit. In Chennai poor fishermen and families sold kidneys after the Indian Ocean tsunami destroyed their livelihoods on the 26th of December 2004 for amounts ranging from 40,000 to 60,000 rupees.
Which country maintains the highest worldwide donor rate and what system does the United States use?
Spain maintains the highest worldwide donor rate with over 35 donors per million population annually. The United States created the Organ Procurement and Transplantation Network through the Organ Transplant Act of 1984 to allocate organs according to methodologies deemed most equitable by experts.
All sources
208 references cited across the entry
- 1webTransplantation
- 3journalPerspectivesWinter 1985
- 4journalSolid organ transplantation in the 21st centuryCara K. Black et al. — October 2018
- 8journalThe effect of HLA-C matching on acute renal transplant rejectionFrohn C, Fricke L, Puchta JC, Kirchner H — February 2001
- 10journalAchieving Equity in Organ TransplantationDP McCarthy — 2023-02-01
- 12journalSolid organ transplantation in the 21st centuryPP Reese — 2018-10-30
- 13journalWorld first pig-to-human cardiac xenotransplantationWayne J. Hawthorne — January 2022
- 14journalClinical solid organ transplantation: current success and challenges for the futureG Novelli — 2023-03-01
- 15journalAllografts in Soft Tissue Reconstructive ProceduresGiedraitis A, Arnoczky SP, Bedi A — Sports Health — March 2014
- 16journalPsychological issues in solid organ transplantationA De Sousa — February 2008
- 17journalWhy is organ transplantation clinically important?Josep M. Grinyó — 2013-06-01
- 18journalThe history of organ transplantationKristen D. Nordham et al. — 2022
- 19newsHow House Republicans Derailed a Scientist Whose Research Could Save LivesLaura Bassett — 2016-11-03
- 20journalHeart-lung transplantation for cystic fibrosis and subsequent domino heart transplantationM. H. Yacoub et al. — 1990
- 22webMayo Clinic Performs First 'Domino' Transplant in Arizona; Rare Procedure Saves Two Lives at Once, Optimizing Organ SupplyMayo Clinic — 28 January 2003
- 23newsSeattle Times Article on domino transplants at Johns HopkinsKaren Blum — Seattletimes.nwsource.com — 1 August 2003
- 24webGood Morning America Video on four-way domino 47674874 transplant at Northwestern Memorial HospitalAbcnews.go.com — 8 April 2008
- 25newsKidney transplant chains shorten the wait for wellnessTurnbull, Barbara — Healthzone.ca — 24 February 2012
- 26news60 lives linked in kidney donor chainLaurence, Jeremy — 27 February 2012
- 28webABO Incompatible Heart Transplantation in Young InfantsAmerican Society of Transplantation — 30 July 2009
- 29journalABO-incompatible (ABOi) heart transplantation in infantsWest, L.J. et al. — 2001
- 30journalDoes ABO-incompatible and ABO-compatible neonatal heart transplant have equivalent survival?Saczkowski, R. et al. — 2010
- 31journalCurrent status of paediatric heart, lung, and heart-lung transplantationBurch, M et al. — 2004
- 32webOPTN Policy 3.7 – Allocation of Thoracic OrgansUnited Network for Organ Sharing — 31 January 2013
- 33journalABO-incompatible heart transplantation in early childhood: An international multicenter study of clinical experiences and limitsUrschel S, Larsen IM, Kirk R, Flett J, Burch M, Shaw N, Birnbaum J, Netz H, Pahl E, Matthews KL, Chinnock R, Johnston JK, Derkatz K, West LJ — 2013
- 34journalImpact of ABO-Incompatible Listing on Wait-List Outcomes Among Infants Listed for Heart Transplantation in the United States: A Propensity AnalysisAlmond CS, Gauvreau K, Thiagarajan RR, Piercey GE, Blume ED, Smoot LB, Fynn-Thompson F, Singh TP — May 2010
- 35journalDonor-specific B-cell tolerance after ABO-incompatible infant heart transplantationFan X, Ang A, Pollock-Barziv SM, Dipchand AI, Ruiz P, Wilson G, Platt JL, West LJ — 2004
- 36journalIntentional ABO-incompatible heart transplantation: a case report of 2 adult patientsTydén, G. et al. — 2012
- 37journalWorld's first whole-eye transplant: the innovations that made it possibleJulian Nowogrodzki — 9 September 2024
- 40webIn a first, a woman with a uterus transplanted from a deceased donor gives birthAimee Cunningham — 2018-12-04
- 41journalLivebirth after uterus transplantation from a deceased donor in a recipient with uterine infertilityDani Ejzenberg et al. — December 2018
- 42newsDoctors plan first testicle transplantSteve Connor — 24 September 1999
- 43journalInterventional Management of Vascular Complications after Renal TransplantationNiklas Verloh et al. — June 2023
- 44journalA Narrative Review of the Evaluation and Management of Liver Transplant Complications in the Emergency DepartmentRayan El Sibai et al. — May 2023
- 45journalPancreatic TransplantationBenjamin M. Mervak et al. — September 2023
- 46journalHeart TransplantationMarkus Y. Wu et al. — September 2023
- 48citationAcute Transplantation RejectionAngel A. Justiz Vaillant et al. — StatPearls Publishing — 2025
- 50journalMinimally invasive robotic kidney transplantation for obese patients previously denied access to transplantation.Oberholzer J, Giulianotti P, Danielson KK, Spaggiari M, Bejarano-Pineda L, Bianco F, Tzvetanov I, Ayloo S, Jeon H, Garcia-Roca R, Thielke J, Tang I, Akkina S, Becker B, Kinzer K, Patel A, Benedetti E — March 2013
- 51journalReactivation of a transplant recipient's inherited human herpesvirus 6 and implications to the graftLeo Hannolainen et al. — 2024
- 52journalOrgan donation after trauma: A 30-year reviewAdam Ackerman et al. — July 2019
- 55journalGrand Challenges in Organ TransplantationJerzy W. Kupiec-Weglinski — 2022
- 56journalResults of Kidney Transplantation From Donors After Cardiac DeathH. Ledinh et al. — September 2010
- 57journalDonation After Cardiac Death as a Strategy to Increase Deceased Donor Liver AvailabilityR. M. Merion et al. — 2006
- 58journalLiver Transplantation Using Donation After Cardiac Death Donors: Long-Term Follow-Up from a Single CenterVera, M.E et al. — 2009
- 59newsAn Ontario man chose a medically assisted death at home. In a world first, he was able to donate his lungsMegan Ogilvie — 7 March 2021
- 62newsSaved By His Daughter's Heart. Man Dying From Heart Disease Gets Gift From Late DaughterCBS Broadcasting Inc — 20 August 2004
- 63journalThe Ultimate GiftMarjorie Rosen — 19 December 1994
- 64journalEthics of a paired-kidney-exchange programRoss LF, Rubin DT, Siegler M, Josephson MA, Thistlethwaite JR, Woodle ES — June 1997
- 65bookLegal and Ethical Aspects of Organ TransplantationDavid Price — Cambridge University Press — 2000
- 66journalThe case for a living emotionally related international kidney donor exchange registryRapaport FT — June 1986
- 68journalA cooperative kidney typing and exchange programHorisberger B, Jeannet M, De Weck A, Frei PC, Grob P, Thiel G — October 1970
- 69webThe Johns Hopkins Hospital | Johns Hopkins Medicine in Baltimore, MDJohns Hopkins Medicine — 24 June 2011
- 70newsJohns Hopkins Leads First 12-Patient, Multicenter "Domino Donor" Kidney TransplantEric Vohr — 16 February 2009
- 71newsKidney donations connect strangers in "Chain of Life" forged by transplantsAmy Ellis Nutt/The Star-Ledger — 5 June 2009
- 72webFirst 16-patient, Multicenter 'Domino Donor' Kidney Transplant11 July 2009
- 73newsMassive transplant effort pairs 13 kidneys to 13 patientsVal Willingham — CNN — 14 December 2009
- 74bookethics and the acquisition of organsT.M. Wilkinson — Oxford University Press — 2011
- 75newsWould you give your kidney to a stranger?CNN — 5 June 2006
- 76newsSupporting Paid Leave for Living Organ DonorsTanya Plibersek — 7 April 2013
- 77journalSingapore legalises compensation payments to kidney donorsBland B — 2008
- 78journalOrgan Trafficking and Transplant Tourism: A Commentary on the Global RealitiesD.A. Budiani-Saberi et al. — May 2008
- 80webBlack Market Kidneys, $160,000 a PopEdecio Martinez — 27 July 2009
- 81journalHuman Organ Donations Under the 'Iranian Model': A Rewarding Scheme for U.S. Regulatory Reform?Movassagh Hooman — 2016
- 82magazinePsst, wanna buy a kidney?The Economist Newspaper Limited 2011 — 16 November 2006
- 83journalKidneys and Controversies in the Islamic Republic of Iran: The Case of Organ SaleDiane M. Tober — September 2007
- 84webA New Outlook on Compensated Kidney DonationsJohn A. Schall — American Association of Kidney Patients — May 2008
- 85newsIntroducing Incentives in the Market for Live and Cadaveric Organ DonationsGary S. Becker et al.
- 86newsShopped Liver: The worldwide market in human organsWilliam Saletan — 14 April 2007
- 87journalOrgan solicitation on the Internet: every man for himself?Appel JM, Fox MD — 2005
- 88journalPaying for Kidneys? A Randomized Survey and Choice ExperimentJulio J. Elías et al. — August 2019
- 89journalHow to Get Real About OrgansAlexander Tabarrok — Fraser Institute — April 2004
- 90journalIranian model of paid and regulated living-unrelated kidney donationGhods AJ, Savaj S — November 2006
- 91journalKidneys on demandGriffin A — March 2007
- 92newsOrgan transplants: Psst, wanna buy a kidney?16 November 2006
- 93webTo Save Lives, Legalize Trade in OrgansDavid Holcberg — The Ayn Rand Center for Individual Rights — 2005
- 94newsWHO says organ demand outstrips supplyAlexander G. Higgins — 30 March 2007
- 95newsIndian police probe kidney sales by tsunami victimsR. Bhagwan Singh — 16 January 2007
- 96journalEthical and social consequences of selling a kidneyRothman DJ — October 2002
- 97webCyprus Clinic Accused of Human Egg Harvesting2010-08-17
- 98newsUntold Stories: The Cyprus ScrambleScott Carney — 17 August 2010
- 99magazineUnpacking the Global Human Egg Trade | Human Eggs for SaleCarney, Scott — 1 September 2010
- 100webWMA Council Resolution on Organ Donation in ChinaWorld Medical Association — May 2006
- 101webUncovering Evil: Illegal Organ Harvesting in China and the 2025 "Stop Forced Organ Harvesting Act"Staci McDermott — 2025-08-07
- 103newsChina may still be using executed prisoners' organs, official admitsStephanie Kirchgaessner — 8 February 2017
- 108journalBlood Harvest: The SlaughterDavid Kilgour
- 109webChina kills millions of innocent meditators for their organs, report findsGabriel Samuels — 2016-06-29
- 112newsOrgan-transplant black market thrives in IndiaAnuj Chopra, Chronicle Foreign Service — 9 February 2008
- 113newsPatients seeking transplants turn to China / Rights activists fear organs are taken from executed prisonersVanessa Hua — 17 April 2006
- 114newsJapan's rich buy organs from executed Chinese prisonersClifford Coonan — 21 March 2006
- 115journalNature's 10: Ten people who mattered in science in 2019David Cyranoski et al. — 19 December 2019
- 116journalCompliance with ethical standards in the reporting of donor sources and ethics review in peer-reviewed publications involving organ transplantation in China: a scoping reviewWendy Rogers et al. — February 2019
- 117journalThe global diffusion of organ transplantation: trends, drivers and policy implications.SL White et al. — 1 November 2014
- 119webDeceased Organ Donors, Annual Rate (p. m. p.) EuropeCouncil of Europe
- 120webDonantes de órganos en España. Número total y tasa anual (p. m. p.)Organización Nacional de Transplantes
- 121webLa ONT estima en 94.500 los transplantes de órganos solidos realizados en 2006 en todo el mundoTransplant Commission of the Council of Europe — 28 August 2007
- 123journalDeceased Donor Program in India: Listing and Allocation Practices and the Legal Process With Respect to Liver TransplantationReddy MS, Varghese J, Mathur SK — January–February 2025
- 124webPrime Minister Organ Donation Compulsion Will Affect MuslimsRamadhan Foundation — 13 January 2008
- 125webIslam and Organ Donation
- 126webNational Organ Transplant UnitMinistry of Health, Singapore
- 127webThe Medical (Therapy, Education and Research) Act (MTERA)Ministry of Health, Singapore
- 128webHuman Organ Transplant ActMinistry of Health, Singapore
- 129webAbout Live OnMinistry of Health, Singapore
- 130journalGovernment policy and organ transplantation in ChinaHuang J, Mao Y, Millis JM — December 2008
- 131journalThe Falun Gong, organ transplantation, the holocaust and ourselvesTom Treasure — March 2007
- 132bookAutonomy and Human Rights in Health Care: An International PerspectiveSpringer — 2007
- 133newsChina fury at organ snatching 'lies'28 June 2001
- 134webIllegal Human Organ Trade from Executed Prisoners in ChinaAmerican University Washington D.C.
- 135webThe Bellagio Task Force Report on Transplantation, Bodily Integrity, and the International Traffic in OrgansInternational Committee of the Red Cross
- 136citationOrgan TransplantationMohammed Ali Al-Bar et al. — Springer — 2015-05-28
- 137webFrequently Asked Questions about the Halachic Organ Donor (HOD) Society14 March 2007
- 138journalBarriers to cadaveric renal transplantation among blacks, women, and the poorAlexander GC, Sehgal AR — October 1998
- 140webU.S. reaches historic milestone of 1 million transplantssaramoriarty — 2022-09-09
- 141journalThe first leg transplant for the treatment of a cancer by Saints Cosmas and DamianG. Androutsos et al. — 2008
- 142bookThe Golden Ledent or Lives of the SaintsJacobus de Voragine — 1275
- 143bookThe Origins of Organ Transplantation: Surgery and Laboratory ScienceThomas Schlich — University of Rochester Press — 2010
- 144journalPodmlađivanje hirurškim putem u Zaječaru 19262004
- 145journalHistory of nephrology: Ukrainian aspectsDmytro Khadzhynov et al. — January 2012
- 146journalSurgeon Yurii Voronoy (1895–1961) – a pioneer in the history of clinical transplantation: in memoriam at the 75th anniversary of the first human kidney transplantationMatevossian E, Kern H, Hüser N, Doll D, Snopok Y, Nährig J, Altomonte J, Sinicina I, Friess H, Thorban S — December 2009
- 147journalLung Homotransplantation in Man: Report of the Initial CaseJames D. Hardy et al. — 21 December 1963
- 148journalLung TransplantationNT Griscom — 21 December 1963
- 152journalRenal Heterotransplantation in ManKeith Reemtsma et al. — September 1964
- 155journalRenal Heterotransplantation From Baboon to Man: Experience With 6 CasesT. E. Stabzl et al. — November 1964
- 156journalClinical xenotransplantation: past, present and future.S. Taniguchi et al. — January 1997
- 157journalHeart Transplantation in ManHardy, James D. et al. — 1964
- 159journalA brief history of cross-species organ transplantationCooper DK — 2012
- 160webZ. Süttő: How Did Denise Darvall Die? A Contribution to the History of the First Heart TransplantThe Linacre Quarterly — 2025-11-20
- 163journalSteroid avoidance or withdrawal for kidney transplant recipientsMaria C Haller et al. — 22 August 2016
- 165newsR.H. Lawler, Pioneer of Kidney Transplants27 July 1982
- 168journalThe history of liver transplantation in TurkeyGökhan Moray et al. — March 2014
- 169newsMan rejects first penis transplantIan Sample — 18 September 2006
- 170journalA preliminary report of penile transplantationW Hu et al. — 2006
- 171newsWoman to give birth after first ovary transplant pregnancyJames Randerson — 9 November 2008
- 172newsPolish man gets quick face transplant after injury22 May 2013
- 173webDoctors claim first successful penis transplantJoseph Netto — CNN — 13 March 2015
- 174newsNewborn baby is youngest organ donor in BritainKat Lay — 20 January 2015
- 175webProducts: RECELL - AVITA Medical, Inc.2024-11-19
- 176webSpray-on skin regeneration system is 'game changer' for burn patientsHolly Pupino — 2021-07-23
- 177newsFirst drone delivery of a donated kidney ends with successful transplantSusan Scutti — 1 May 2019
- 178newsDouble greffe des bras et des épaules à Lyon, une première mondialeSciences et Avenir with AFP — 15 January 2021
- 180webMan who received landmark pig heart transplant died of pig virus, surgeon saysMaya Yang — 6 May 2022
- 181journalSurgery for advanced thymic malignancies: how far can we push the limit?Marcello Carlo Ambrogi et al. — 3 April 2023
- 182journalResection of thymic carcinoma after induction therapy and reconstruction of right ventricular outflow tract with pulmonary homograftStefano Cafarotti et al. — April 2023
- 183webPrima mondiale al CardiocentroRadiotelevisione svizzera — 12 April 2023
- 190newsSurgeons Perform First Human Bladder TransplantEmily Baumgaertner Nunn — 2025-05-18
- 192journalHistory of Lung TransplantationDabak G, Şenbaklavacı Ö — 2016
- 193webQuestions about Tissues – Tissue and Tissue Product Questions and AnswersCenter for Biologics Evaluation and Research
- 194journalRecommendations for Screening of Donor and Recipient Prior to Solid Organ Transplantation and to Minimize Transmission of Donor-Derived InfectionsLen, O. et al. — 29 January 2014
- 195citationIntroduction and Study ContextNational Academies Press (US) — 2022-02-25
- 196newsChina issues new rules on organsBBC — 7 April 2007
- 197newsTwo Indonesians plead guilty in Singapore midorgan trading caseAbs-Cbn Interactive — 28 June 2008
- 198newsCK Tang boss quizzed by policeLee Hui Chieh et al. — 28 June 2008
- 199webIt's Perfectly Legal in Many States to Deny People With Down Syndrome Organ TransplantsPepper Stetler — 2021-06-14
- 200journalUse of neurodevelopmental delay in pediatric solid organ transplant listing decisions: Inconsistencies in standards across major pediatric transplant centersChristopher T. Richards et al. — November 2009
- 201journalPro/con ethics debate: When is dead really dead?Whetstine L, Streat S, Darwin M, Crippen D — 2005
- 203webCancer Patient Gets First Totally Artificial WindpipeNPR — 8 July 2011
- 205magazineThe Celebrity Surgeon Who Used Love, Money, and the Pope to Scam an NBC News ProducerAdam Ciralsky — 31 January 2016
- 206webKarolinskas "superkirurg" utreds och granskas13 January 2016
- 209journalA randomized trial of normothermic preservation in liver transplantationDavid Nasralla et al. — 2018
- 210bookExploring the State of the Science of Solid Organ Transplantation and Disability: Proceedings of a WorkshopNational Academies of Sciences Engineering and Medicine — National Academies Press — 30 June 2021
- 211journalAdolescent non-adherence: prevalence and consequences in liver transplant recipientsR. K. Berquist et al. — 2006