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Singapore
By Sushant Shukla 14 min read

Ang Peng Tiam v Singapore Medical Council and another matter [2017] SGHC 143

A doctor commits professional misconduct if they intentionally and deliberately depart from professional standards, such as by making a false representation to a patient without a reasonable basis or failing to inform a patient of a viable treatment option.

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Case Details

  • Citation: [2017] SGHC 143
  • Court: Court of Three Judges of the Republic of Singapore
  • Decision Date: 27 June 2017
  • Coram: Sundaresh Menon CJ, Andrew Phang Boon Leong JA, Judith Prakash JA
  • Case Number: Originating Summons No 8 of 2016; Originating Summons No 9 of 2016
  • Hearing Date(s): 13 February 2017
  • Appellant / Applicant: ANG PENG TIAM
  • Respondent: SINGAPORE MEDICAL COUNCIL
  • Counsel for Appellant: Edwin Tong, S.C., Mak Wei Munn, Tan Ruyan Kristy and Ong Hui Fen Rachel (Allen & Gledhill LLP)
  • Counsel for Respondent: Ho Pei Shien Melanie, Lim Xian Yong Alvin, Lim Wan Yu Cheronne, Chang Man Phing Jenny, and Lim Ying Min (Wongpartnership LLP)
  • Practice Areas: Professions; Medical profession and practice; Professional conduct; Professional Misconduct
  • Statutory Basis: Section 53(1)(d) of the Medical Registration Act (Cap 174, 2004 Rev Ed)

Summary

The decision in Ang Peng Tiam v Singapore Medical Council [2017] SGHC 143 represents a watershed moment in Singapore’s medical jurisprudence, particularly concerning the boundaries of professional misconduct in the context of patient communication and informed consent. The Court of Three Judges was tasked with determining whether Dr Ang Peng Tiam, a prominent medical oncologist, committed professional misconduct under s 53(1)(d) of the Medical Registration Act. The dispute centered on two primary allegations: first, that Dr Ang made a false representation to a patient, MT, regarding the probability of her cancer responding to a specific treatment regimen; and second, that he failed to offer surgery as a viable treatment option for her Stage IIB lung cancer.

The Disciplinary Tribunal (DT) had originally convicted Dr Ang on these two charges, imposing a global fine of $25,000. Dr Ang appealed against the conviction, while the Singapore Medical Council (SMC) cross-appealed, arguing that the sentence was manifestly inadequate. The High Court’s judgment provides a rigorous analysis of the "objective patient" standard in interpreting medical representations. The Court held that a doctor’s statements must be assessed from the perspective of a reasonable layperson in the patient’s position. Crucially, the Court determined that providing a specific, high-percentage probability of success (70%) without a patient-specific clinical basis (specifically, the patient's EGFR mutation status) constituted a false representation and a deliberate departure from professional standards.

Furthermore, the Court reinforced the principle that doctors have a non-delegable duty to inform patients of all viable treatment options, even those the doctor may personally disfavor or believe to be less effective. By failing to mention surgery, Dr Ang deprived the patient of her autonomy to choose a different clinical path. The doctrinal contribution of this case lies in its clarification of the first limb of the Low Cze Hong test for professional misconduct: an intentional and deliberate departure from the standards observed by members of the profession of good repute and competence.

Ultimately, the Court dismissed Dr Ang’s appeal against conviction and allowed the SMC’s appeal on sentence. The Court substituted the $25,000 fine with an eight-month suspension, signaling that misleading patients on the efficacy of treatments is a grave breach of the doctor-patient relationship that warrants a custodial-style professional sanction rather than a mere financial penalty. This case serves as a stern reminder to the medical community that eminence and seniority do not provide immunity from disciplinary oversight; rather, they may serve as aggravating factors when professional standards are breached.

Timeline of Events

  1. 30 March 2010: MT, a 55-year-old female, first consulted Dr Ang at the Parkway Cancer Centre (PCC) at Mount Elizabeth Hospital following a referral for suspected lung cancer.
  2. 31 March 2010: MT returned to review PET-CT and MRI results. Dr Ang explained the findings, suggesting an aggressive tumour, and a biopsy was performed later that day.
  3. 1 April 2010: The biopsy confirmed adenocarcinoma. Dr Ang recommended chemotherapy (gemcitabine and cisplatin) and targeted therapy (gefitinib). During this consultation, Dr Ang made the representation that there was "at least a 70% chance" of disease control.
  4. October 2010: MT passed away approximately six months after starting the treatment recommended by Dr Ang.
  5. 15 December 2010: MT’s daughters lodged a formal complaint with the Singapore Medical Council (SMC).
  6. 27 June 2011: The Complaints Committee (CC) requested an explanation from Dr Ang.
  7. 19 July 2011: Dr Ang provided his initial explanation to the CC.
  8. 2 May 2012: The CC informed Dr Ang that the matter would be referred to a Disciplinary Tribunal (DT).
  9. 3 April 2015: A second DT was finally constituted after significant delays in the initial proceedings.
  10. 22 April 2015: A Notice of Inquiry was served on Dr Ang, containing four charges of professional misconduct.
  11. November 2015 – February 2016: The DT conducted the inquiry over two tranches.
  12. 12 July 2016: The DT delivered its verdict, convicting Dr Ang on the 1st and 2nd charges and acquitting him on the 3rd and 4th charges.
  13. 16 July 2016: The DT sentenced Dr Ang to a global fine of $25,000.
  14. 13 February 2017: The Court of Three Judges heard the cross-appeals (OS 8/2016 and OS 9/2016).
  15. 27 June 2017: The High Court delivered its judgment, dismissing Dr Ang's appeal and imposing an 8-month suspension.

What Were the Facts of This Case?

Dr Ang Peng Tiam is a highly experienced medical oncologist in private practice and the founding head of the Department of Medical Oncology at the Singapore General Hospital. The patient, MT, was 55 years old when she was referred to Dr Ang on 30 March 2010. She had been diagnosed with a 6.8cm mass in the lower lobe of her right lung at Tan Tock Seng Hospital. During the initial consultation, Dr Ang ordered several tests, including blood work, an MRI of the brain, and a PET-CT scan. However, he did not order an epidermal growth factor receptor (EGFR) mutation analysis at this stage, which is a critical diagnostic tool for determining the efficacy of targeted therapies like gefitinib.

On 31 March 2010, Dr Ang reviewed the test results with MT and her family. The PET-CT scan showed a large, hypermetabolic, and aggressive tumour with "satellite nodules" in the same lung, but no distant metastasis. Dr Ang explained that while the tumour was fast-growing, the MRI showed no cancer in the brain. A biopsy was performed that afternoon, which confirmed the diagnosis of adenocarcinoma, a common type of non-small cell lung cancer (NSCLC).

The core of the dispute arose during the third consultation on 1 April 2010. Dr Ang recommended a treatment plan consisting of chemotherapy (gemcitabine and cisplatin) combined with targeted therapy (gefitinib at 250mg every other day). During this meeting, Dr Ang made a representation to MT and her family that there was "at least a 70% chance" the tumour would shrink and that this was a "very high percentage." He supported this by circling "70%" on a memo and drawing diagrams to illustrate the expected shrinkage. MT’s husband recorded part of this conversation. Dr Ang’s justification for the 70% figure was based on four "phenotypes": MT was Chinese, female, a non-smoker, and had adenocarcinoma. He believed these factors indicated a high likelihood of an EGFR mutation, which would make the cancer highly responsive to gefitinib.

Crucially, Dr Ang did not inform MT that surgery was a viable treatment option. MT’s cancer was classified as Stage IIB (cT3 N0 M0). While Dr Ang personally believed that surgery was not the best option due to the "satellite nodules" and the aggressive nature of the tumour, expert evidence from Dr Tan Yew Oo (the SMC's expert) and even Dr Ang's own expert, Dr Peter Mack, suggested that surgery was a standard and viable option for Stage IIB patients that should at least have been discussed. MT proceeded with Dr Ang’s recommended chemo-targeted therapy. Unfortunately, her condition deteriorated, and she passed away in October 2010.

Following MT's death, her daughters filed a complaint with the SMC in December 2010. The disciplinary process was notably protracted, taking over five years to reach a DT hearing. The SMC eventually preferred four charges against Dr Ang. The 1st Charge alleged that Dr Ang made a false representation regarding the 70% chance of success without a proper clinical basis. The 2nd Charge alleged that he failed to offer surgery as a treatment option. The 3rd and 4th charges related to the specific dosage of gefitinib and the failure to perform an EGFR test before starting treatment; Dr Ang was acquitted of these latter two charges by the DT, and the SMC did not appeal those acquittals.

The DT found that the 70% representation was false because, without an EGFR test, the actual probability of response was significantly lower—approximately 20% to 30% for chemotherapy alone, and only if the patient was EGFR-positive would the combined rate approach 70-80%. By stating "at least 70%" without knowing the EGFR status, Dr Ang had misled the patient. Regarding the 2nd Charge, the DT found that surgery was a viable option for Stage IIB lung cancer and that Dr Ang's failure to mention it constituted a serious omission. The DT sentenced Dr Ang to a $25,000 fine, noting his long and unblemished record but also the gravity of the misconduct.

The appeal brought several critical legal issues to the forefront of the Court of Three Judges' deliberation, focusing on the definition of professional misconduct and the standards of patient communication:

  • The Interpretation of Medical Representations: How should a doctor’s statements to a patient be interpreted? Should the court apply a subjective test based on the doctor’s intent, or an objective test based on how a reasonable patient would understand the words in context?
  • The Basis for Clinical Representations: Does a doctor commit professional misconduct by providing a specific percentage of success (e.g., 70%) if that percentage is based on general "phenotypes" rather than patient-specific diagnostic tests (e.g., EGFR status) that are available?
  • The Scope of the Duty to Inform: Does the duty to inform a patient of treatment options extend to options that the doctor, in his professional judgment, considers inferior or inappropriate, provided those options are considered "viable" by a respectable body of medical opinion?
  • The Application of the Low Cze Hong Test: Did Dr Ang’s conduct amount to an "intentional, deliberate departure from standards observed or approved by members of the profession of good repute and competence"?
  • Sentencing Principles in Disciplinary Proceedings: Is a fine an adequate deterrent for professional misconduct involving false representations to patients, or does the protection of the public and the standing of the profession require a term of suspension? Furthermore, how should significant procedural delay affect the final sentence?

How Did the Court Analyse the Issues?

The Court began its analysis by reaffirming the two-limb test for professional misconduct established in Low Cze Hong v Singapore Medical Council [2008] 3 SLR(R) 612. The first limb requires an "intentional, deliberate departure from standards observed or approved by members of the profession of good repute and competence." The second limb involves conduct that brings disrepute to the profession. The Court focused primarily on the first limb.

The 1st Charge: False Representation

Regarding the "70% chance" representation, the Court rejected Dr Ang’s argument that the statement was merely an expression of opinion or a "possibility." The Court held that the meaning of the statement must be determined objectively:

"The DT was correct to approach the question of the meaning of the Statement from the perspective of how a reasonable person in MT’s position would have understood it in the context in which it was made." (at [43])

The Court found that by using a specific number like "70%" and describing it as a "very high percentage," Dr Ang was conveying a high degree of certainty. The Court then examined whether there was a reasonable basis for this figure. The evidence showed that the 70-80% response rate was only applicable to patients who were EGFR-positive. Without an EGFR test, the probability of MT being EGFR-positive was approximately 50-60% based on her phenotypes. Therefore, the "mathematical probability" of a response was the product of the likelihood of her being EGFR-positive and the response rate of EGFR-positive patients, which resulted in a figure much lower than 70%.

The Court concluded that Dr Ang had no reasonable basis to offer a "70%" assurance without the EGFR test results. To do so was to "overstate the prospects of success" and "mislead the patient." This was not a mere error of judgment but a deliberate choice to present an optimistic figure to persuade the patient to undergo the treatment he preferred. This constituted professional misconduct under the first limb of Low Cze Hong.

The 2nd Charge: Failure to Offer Surgery

The Court then addressed the failure to offer surgery. Dr Ang argued that he did not believe surgery was appropriate for MT because her cancer was aggressive and likely to have spread despite the PET-CT results. However, the Court relied on the expert evidence which stated that surgery is the "gold standard" for Stage IIB lung cancer. The Court referred to the then-recent decision in [2017] SGCA 38, noting that while that case dealt with negligence, the underlying principle of patient autonomy was relevant:

"it was not open to Dr Ang to limit MT’s treatment options by excluding from her consideration, those which he, even if for good reason, thought were not the best options for her. It was not Dr Ang’s role to decide, but to inform." (at [86])

The Court held that because surgery was a "viable" option supported by a respectable body of medical opinion, Dr Ang had a professional duty to disclose it. His failure to do so was a "conscious and deliberate" departure from the required standard of conduct, thus satisfying the test for professional misconduct.

Sentencing Analysis

In evaluating the sentence, the Court emphasized that the primary purposes of disciplinary sanctions are the protection of the public and the maintenance of the profession's reputation. The Court found the DT’s fine of $25,000 to be "manifestly inadequate." The Court noted that misleading a patient about the efficacy of a treatment is a "serious matter" because it "strikes at the very heart of the trust" in the doctor-patient relationship.

The Court considered Dr Ang’s seniority as an aggravating factor, citing Singapore Medical Council v Kwan Kah Yee [2015] 5 SLR 201. A senior doctor is expected to set a higher standard. While the Court acknowledged the 5.5-year delay in proceedings, it held that delay could only mitigate a sentence, not justify an inadequate one. The Court determined that a suspension was necessary to reflect the gravity of the misconduct, ultimately settling on eight months as a proportionate response.

What Was the Outcome?

The Court of Three Judges delivered a clear and decisive outcome that significantly increased the severity of the sanctions against Dr Ang Peng Tiam. The operative orders of the Court were as follows:

"we dismiss Dr Ang’s appeal in Originating Summons No 8 of 2016. His conviction in respect of both charges is upheld. We allow the SMC’s appeal in Originating Summons No 9 of 2016, and substitute the DT’s sentence of a global fine of $25,000 in respect of both charges with a total term of suspension for eight months." (at [129])

The Court’s decision resulted in the following specific consequences:

  • Conviction Upheld: Dr Ang’s appeal against the Disciplinary Tribunal’s findings on the 1st and 2nd charges was dismissed in its entirety. The Court affirmed that he had committed professional misconduct by making a false representation and by failing to inform the patient of a viable treatment option (surgery).
  • Sentence Substituted: The global fine of $25,000 was set aside. In its place, the Court imposed a suspension from medical practice for a period of eight months. This reflected the Court's view that the misconduct was too serious for a mere financial penalty.
  • Costs: The Court did not make an immediate order on costs. Instead, it directed the parties to attempt to reach an agreement. Failing such agreement, the parties were ordered to file written submissions (limited to eight pages) within 14 days of the judgment (by 11 July 2017) for the Court to determine the appropriate costs order.
  • Professional Standing: The judgment reaffirmed that Dr Ang’s seniority and previously unblemished 35-year career, while noted, did not outweigh the need for a deterrent sentence given the nature of the breach of trust involved in misleading a patient.

Why Does This Case Matter?

The Ang Peng Tiam decision is a cornerstone of Singapore medical law for several reasons, primarily because it bridges the gap between the law of informed consent and the law of professional discipline. For practitioners, the case establishes that the standards for "informed consent" articulated in the context of medical negligence (such as in [2017] SGCA 38) are mirrored by professional disciplinary standards. A failure to provide a patient with the information necessary to make an autonomous decision is not just a potential tort; it is a "deliberate departure" from professional standards that can lead to suspension.

Secondly, the case provides a strict warning against the use of "statistical optimism." Doctors often use percentages to explain risks and benefits to patients. This judgment clarifies that if a doctor uses a specific number, they must have a patient-specific clinical basis for that number. Relying on general population statistics (phenotypes) when a specific diagnostic test (EGFR) is available but not yet performed renders the representation "false" if the specific test is required to validate that probability. This emphasizes the need for precision in medical communication.

Thirdly, the Court’s treatment of "viable options" is significant. It removes the "doctor knows best" shield in disciplinary proceedings. Even if a doctor has a strong, evidence-based preference for one treatment over another, they cannot unilaterally "filter" the options presented to the patient. If an option is "viable"—meaning it is supported by a respectable body of medical opinion—the patient must be told about it. This reinforces the shift toward a more patient-centric model of medicine in Singapore.

Fourthly, the sentencing aspect of the case is a major development. By substituting a fine with an eight-month suspension, the Court signaled that "false representations" are among the most serious forms of professional misconduct. The Court explicitly rejected the idea that a fine is sufficient for a doctor who misleads a patient, even if there is no evidence of "dishonesty" in the sense of a desire for personal gain. The "intentional" element of the misconduct is satisfied if the doctor intended to make the statement and intended to omit the alternative option, regardless of whether they thought they were acting in the patient's best interests.

Finally, the case addresses the issue of procedural delay. While the Court acknowledged that a 5.5-year delay is "unsatisfactory," it established that delay is a mitigating factor that goes to the *length* of a suspension, rather than a factor that can downgrade a suspension to a fine. This provides clarity for future disciplinary cases where the SMC’s processes may be protracted.

Practice Pointers

  • Objective Communication: Doctors must realize that their words will be interpreted as a reasonable patient would understand them. Avoid using high-percentage figures (e.g., "70% chance") unless they are backed by the specific patient's diagnostic data.
  • Disclosure of All Viable Options: A doctor must disclose all treatment options that are considered "viable" by a respectable body of medical opinion, even if the doctor believes those options are inferior to the recommended course.
  • Patient Autonomy is Paramount: The role of the doctor is to inform, not to decide. Withholding a viable option like surgery because of a personal clinical preference constitutes a deliberate departure from professional standards.
  • Basis for Statistics: When providing prognostic statistics, clearly state the assumptions behind those numbers (e.g., "This 70% figure assumes you have a specific mutation which we have not yet confirmed").
  • Seniority as a Double-Edged Sword: Eminent and senior practitioners should be aware that their seniority is an aggravating factor in sentencing. The Court expects senior doctors to be the "standard-bearers" of the profession.
  • Impact of Delay: While significant delays in SMC proceedings can mitigate a sentence, they will not prevent a suspension if the underlying misconduct is sufficiently grave.
  • Documentation: Ensure that memos and notes given to patients (like the one Dr Ang circled "70%" on) accurately reflect the clinical reality and the conditional nature of any prognostic statements.

Subsequent Treatment

The ratio in Ang Peng Tiam has been consistently applied in subsequent medical disciplinary cases to define the threshold for "intentional and deliberate departure" from professional standards. It is frequently cited alongside [2017] SGCA 38 to emphasize the professional duty of disclosure. Later cases have followed its lead in treating the misleading of patients as a category of misconduct that generally warrants suspension rather than a fine, reinforcing the "deterrence" and "public protection" mandates of the Court of Three Judges.

Legislation Referenced

Cases Cited

Source Documents

Written by Sushant Shukla
Topics
Singapore SLW Case Law Singapore High Court Medical Law Medical 2017 cases
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