# CED Cannabis Science Digest: Oncology, Prenatal, and Veterinary CBD Signals > **Author:** Benjamin Caplan, MD (ABFM Board Certified, MA Lic. #240562, NPI: 1962722637) > **Publisher:** CED Clinic (https://cedclinic.com) > **Canonical URL:** https://cedclinic.com/oncology-cannabis-treatment-adherence-signals-2026/ > **Published:** 2026-06-26T07:13:28-04:00 | **Last Modified / Clinically Audited:** 2026-09-27T22:05:14-04:00 > **Clinical Summary:** Explore oncology cannabis treatment adherence and prenatal and veterinary CBD signals in this 2026 CED Cannabis Science Digest for clinical relevance. --- CED Clinical Relevance #55 Notable Clinical Interest These three verified papers do not settle a treatment question on their own, but they sharpen three recurring clinical conversations: who stops [medical cannabis](https://cedclinic.com/therapeutic-benefits-of-thc/) in oncology care, why prenatal cannabis evidence is hard to compare across models, and how far antitumor CBD claims remain from bedside use. Clinical Insight | CED Clinic Not every useful cannabis paper changes practice in one step. Sometimes the value is in showing where the evidence still breaks down and where counseling needs to become more specific. That is what these three papers do. A prospective Israeli oncology cohort suggests that voluntary medical-cannabis discontinuation is common and often linked to either side effects or perceived lack of benefit, which matters for expectation-setting and follow-up. A prenatal-cannabis methods review shows why pregnancy claims are often harder to compare than headlines imply, because preclinical models vary widely in formulation, route, dose, and outcome design. A canine-oncology systematic review shows that antitumor CBD enthusiasm still rests mostly on preclinical or veterinary-translational work rather than clinical proof. None of these studies proves that cannabis is broadly effective or broadly ineffective. Their value is in helping clinicians and careful readers separate symptom-management reality, research-design limits, and early mechanistic promise from claims that are not ready for routine practice. DigestOncologyPregnancyCBDEvidence Limits Audience Patients, oncologists, oncology nurses, primary-care clinicians, pregnancy counselors, cannabis clinicians, and careful readers of translational CBD science Primary Topic Three evidence-limited cannabis signals spanning oncology adherence, prenatal cannabis-research methods, and veterinary antitumor CBD literature Source [Read the full study](https://pubmed.ncbi.nlm.nih.gov/42302583/) Table of Contents - [CED Cannabis Science Digest: 3 Oncology, Prenatal, and Veterinary CBD Signals](#CED_Cannabis_Science_Digest_3_Oncology_Prenatal_and_Veterinary_CBD_Signals) - [How to Read a Mixed-Evidence Cannabis Digest Without Overstating Any One Paper](#How_to_Read_a_Mixed-Evidence_Cannabis_Digest_Without_Overstating_Any_One_Paper)[A Better Reading Order for This Digest](#A_Better_Reading_Order_for_This_Digest) - [The Same Study Can Mean Different Things Depending on the Question Being Asked](#The_Same_Study_Can_Mean_Different_Things_Depending_on_the_Question_Being_Asked)[Three Papers, Three Different Questions](#Three_Papers_Three_Different_Questions) - [Counseling Gets Better When Evidence Labels Stay Visible](#Counseling_Gets_Better_When_Evidence_Labels_Stay_Visible) - [Starting Medical Cannabis Is Not the Same as Staying on It](#Starting_Medical_Cannabis_Is_Not_the_Same_as_Staying_on_It) - [Methods Matter Before Pregnancy Claims Can Mature](#Methods_Matter_Before_Pregnancy_Claims_Can_Mature) - [Antitumor CBD Claims Are Still Early Translational Science](#Antitumor_CBD_Claims_Are_Still_Early_Translational_Science) - [The Useful Form of Skepticism Is Specific](#The_Useful_Form_of_Skepticism_Is_Specific) - [Better Evidence Policy Starts With Better Categories](#Better_Evidence_Policy_Starts_With_Better_Categories) - [What Better Follow-Up Would Look Like](#What_Better_Follow-Up_Would_Look_Like) - [Frequently Asked Questions](#Frequently_Asked_Questions)[Related](#Related) ## CED Cannabis Science Digest: 3 Oncology, Prenatal, and Veterinary CBD Signals This digest preserves three cannabis papers that are useful precisely because they demand restraint. One prospective oncology cohort shows how often [medical cannabis](https://cedclinic.com/therapeutic-benefits-of-thc/) is discontinued and why. One prenatal-cannabis methods review explains why pregnancy claims are difficult to compare across preclinical models. One veterinary systematic review shows that antitumor cannabidiol signals remain early, nonclinical, and far from proving cancer benefit in people. What This Study Teaches Us These studies teach three different forms of caution. The oncology cohort reminds clinicians that starting [medical cannabis](https://cedclinic.com/therapeutic-benefits-of-thc/) is only part of the story; persistence, tolerability, and patient expectations matter just as much. The prenatal review reminds readers that methodology can shape the apparent result before any clinical recommendation is even possible. The canine-oncology review reminds anyone interested in anticancer CBD claims that preclinical activity and clinical benefit are not interchangeable. In other words, [cannabis science](https://cedclinic.com/biphasic-effects-of-cannabis/) often becomes more useful when it narrows a claim instead of expanding it. Why This Matters Patients and clinicians repeatedly encounter strong cannabis claims in cancer care, pregnancy discussions, and CBD product marketing. These papers matter because they slow those claims down. Oncology patients need honest counseling about the possibility that medical cannabis may be stopped because it does not help enough or because adverse effects get in the way. Pregnancy counseling needs a better explanation for why mechanistic or animal findings do not always line up neatly, especially when exposure methods differ so widely. And anyone hearing that CBD might fight cancer needs to know whether the data come from cell models, veterinary science, or human clinical outcomes. These distinctions are not academic. They change how safely a clinician should counsel and how confidently a patient should interpret a headline. Study Snapshot Post Type Evidence digest using the canonical CED layout Items Reviewed 3 verified, nonduplicate, digest-eligible items Item 1 Prospective oncology cohort on voluntary medical-cannabis discontinuation Item 2 Methods review of preclinical prenatal cannabis exposure research Item 3 Systematic review of canine oncology cannabidiol studies Primary Dates June 15, 2026; June 5, 2026; 2026 Content Lanes Safety Signal; Mechanism Watch; Mechanism Watch Main Takeaway Useful for counseling and evidence framing, not for broad treatment proof Related Reading 3 verified live CED Clinic internal links Clinical Bottom Line The most defensible publication value in this set is not a sweeping cannabis claim. It is a careful digest showing where the evidence still needs humility. Oncology persistence data can improve counseling now. Prenatal methods work can improve how readers judge future pregnancy headlines. Veterinary and preclinical antitumor CBD findings can inform research interest, but they should not be mistaken for established cancer treatment evidence in humans. Digest Contents - [Digest Card 1 | Oncology Non-Adherence](#digest-card-2-digest-card-1-oncology-non-adherence) - [Digest Card 2 | Prenatal Cannabis Methods](#digest-card-3-digest-card-2-prenatal-cannabis-methods) - [Digest Card 3 | Canine Oncology CBD Review](#digest-card-4-digest-card-3-canine-oncology-cbd-review) Why These Three Papers Belong Together These papers answer different questions, but they share the same practical lesson: readers get into trouble when they treat early or indirect cannabis evidence as if it had already crossed into dependable bedside guidance. The oncology paper is the closest to immediate clinical use because it tracks what happens after patients start medical cannabis. The prenatal paper is a methods map, not an outcomes trial, but it explains why future pregnancy claims need close reading. The canine-oncology review shows why antitumor CBD conversations should stay translational and hypothesis-driven instead of sounding clinically settled. Digest Card 1 | Oncology Non-Adherence **Title:** [Medical cannabis treatment](https://cedclinic.com/medical-cannabis-eligibility-book-appointment/) non-adherence among oncology patients: A prospective cohort analysis in Israel. **Authors / source / date / lane:** Joshua Aviram, Shadia Zgairy, David Meiri, and Sharon R. Snitzman; *European Journal of Oncology Nursing*; June 15, 2026. PMID 42302583. DOI 10.1016/j.ejon.2026.103247. Content lane: Safety Signal. Source URL: https://pubmed.ncbi.nlm.nih.gov/42302583/ **What was investigated:** Investigators followed oncology patients who initiated medical cannabis and examined which baseline features were associated with voluntary discontinuation over six months because of perceived ineffectiveness or cannabis-related adverse effects. **What it appeared to find:** Among 186 patients eligible for the non-adherence analysis, 68% remained adherent and 32% discontinued voluntarily. Among those who stopped, 40% cited lack of benefit and 60% cited adverse effects. Non-adherence was more common in patients without prior cannabis experience, in patients with less positive baseline attitudes toward medical cannabis, and in some clinical subgroups including bladder cancer, stomach cancer, and cardiac comorbidity. **Limitations and uncertainty:** This was an exploratory prospective cohort from one medical setting, not a randomized trial of counseling or product strategy. The primary analysis excluded death, recovery, and loss to follow-up from voluntary non-adherence events, which helps clarify one question but does not describe the entire oncology experience. The authors themselves call for validation in larger prospective datasets. **Why it is noteworthy:** Many cannabis conversations in oncology focus on who starts treatment. This paper is more useful because it shows why some patients stop. That can improve expectation-setting, follow-up planning, and adverse-effect counseling without pretending the study proves one product strategy is best. Digest Card 2 | Prenatal Cannabis Methods **Title:** Diverse Methodologies Used for Preclinical Research into Prenatal Cannabis Exposure. **Authors / source / date / lane:** Suzy Davies, Zarena M. Dominguez, and Jessie R. Maxwell; *Journal of Visualized Experiments*; June 5, 2026. PMID 42330002. DOI 10.3791/69557. Content lane: Mechanism Watch. Source URL: https://pubmed.ncbi.nlm.nih.gov/42330002/ **What was investigated:** This review examined how preclinical prenatal-cannabis research is being done, including cell-based assays, organoids, animal models, and newer artificial-intelligence or machine-learning approaches. It focused on how cannabis formulations, routes of administration, and dosing complicate interpretation. **What it appeared to find:** The authors argued that methodological variability is one of the central reasons prenatal cannabinoid evidence remains hard to compare across studies. Differences in THC or CBD formulation, oral versus inhaled versus topical exposure, and pharmacokinetic or bioavailability assumptions can materially change what a model seems to show. **Limitations and uncertainty:** This is a methods-focused review, not a human pregnancy outcome study and not a direct test of prenatal cannabis harm or benefit. It can explain why the evidence base is uneven, but it cannot by itself answer what any specific level of human pregnancy exposure causes. **Why it is noteworthy:** Pregnancy headlines often flatten the evidence into one-direction certainty. This paper is useful because it shows why research-design details matter so much in prenatal cannabis work and why better model standardization is part of responsible counseling. Digest Card 3 | Canine Oncology CBD Review **Title:** Potential antitumor effect of cannabidiol (CBD) in canine oncology: a systematic review. **Authors / source / date / lane:** Francisca J. Medina and Cristian G. Torres; *Frontiers in Veterinary Science*; 2026. PMID 42254894. DOI 10.3389/fvets.2026.1800410. Content lane: Mechanism Watch. Source URL: https://pubmed.ncbi.nlm.nih.gov/42254894/ **What was investigated:** This systematic review gathered published evidence on CBD in canine cancer models, looking at lymphoma, mammary cancer, glioma, prostate cancer, osteosarcoma, urothelial carcinoma, and combination-treatment experiments. **What it appeared to find:** Across the available canine-focused literature, the dominant signals were antiproliferative and proapoptotic effects in preclinical settings, sometimes involving pathways such as ERK, JNK, and caspases. Some combination studies suggested synergy, while others suggested antagonism, underscoring how unsettled the translational picture remains. **Limitations and uncertainty:** The review is mostly preclinical, often cellular, and veterinary in orientation. It does not show that CBD treats cancer in dogs in routine clinical practice, and it certainly does not establish anticancer efficacy in humans. Formulation, dosing, tumor context, and study quality remain inconsistent. **Why it is noteworthy:** Antitumor CBD claims circulate widely. This review is valuable because it places those claims back where they belong: in an early translational evidence lane that may justify more research, but not confident bedside promises. How Strong Is This Evidence? All three items are peer-reviewed and primary-source verified, but they are not equally close to practice. The oncology paper is a prospective human cohort and therefore the strongest direct clinical signal in the batch. The prenatal paper is a methods-focused review that improves how future research should be interpreted. The canine-oncology paper is a systematic review, but the underlying evidence is still mostly preclinical and veterinary-translational. That makes this a useful digest for framing and skepticism rather than for simple therapeutic guidance. Where This Paper Deserves Skepticism The oncology study does not prove that one counseling approach or one cannabis product will improve adherence. The prenatal review does not establish pregnancy outcomes and should not be overread as direct harm quantification. The canine-oncology review is exactly the kind of paper that can be exaggerated by people who blur cell-model activity into human treatment proof. Good skepticism here does not discard the papers. It keeps each one inside the evidence ceiling it actually earned. What This Paper Does Not Show This digest does not show that medical cannabis reliably improves persistence in oncology patients, that any one prenatal cannabis model can be translated directly to human pregnancy counseling, or that CBD is an established anticancer therapy in dogs or people. It also does not justify replacing oncology symptom-management standards, pregnancy-risk counseling, or evidence-based cancer care with cannabinoid optimism. How This Fits With the Broader Clinical Conversation [Cannabis science](https://cedclinic.com/biphasic-effects-of-cannabis/) becomes harder to interpret when very different evidence lanes are spoken about as if they were interchangeable. A prospective oncology cohort, a prenatal methods review, and a veterinary systematic review all matter, but not in the same way. The oncology paper is most useful for real-world counseling because it identifies why some patients stop treatment after initiation. The prenatal methods paper is most useful for slowing down overconfident pregnancy claims. The canine-oncology review is most useful for teaching how early mechanistic promise can outrun clinical proof. Taken together, these studies argue for narrower questions, better expectation-setting, and more honest labeling of where the evidence is human, where it is preclinical, and where it is still primarily translational. Dr. Caplan’s Take *The oncology cohort is the strongest practical paper here because it addresses a question clinicians actually face: not just whether patients try medical cannabis, but whether they stay with it and why they stop. A discontinuation signal tied to side effects or perceived ineffectiveness is more useful for counseling than another generic symptom-relief claim.* *The prenatal methods review matters because pregnancy counseling often gets pulled into headline-level certainty before the research methods have earned it. When models differ this much in route, formulation, and dosing, humility is not a weakness. It is part of evidence quality.* *The canine-oncology review is exactly where I would want readers to slow down. Antitumor CBD claims are interesting, but this is still early translational science. The closer a claim gets to cancer treatment language, the more discipline we need about what is actually known in humans.* What a Careful Reader Should Take Away A careful reader should come away from this digest more precise, not more absolute. Use the oncology paper to guide expectation-setting and follow-up conversations. Use the prenatal review to interpret pregnancy evidence more carefully. Use the canine-oncology review to keep anticancer CBD discussions clearly labeled as early translational science rather than established therapy. Evidence Interpretation Guide ## How to Read a Mixed-Evidence Cannabis Digest Without Overstating Any One Paper A mixed digest like this is useful only if each paper stays in its own lane. That means distinguishing a human cohort from a methods review and from a veterinary systematic review whose underlying evidence is still largely preclinical. The goal is not to make the three papers sound equally strong. The goal is to help readers see what kind of question each paper can answer and what kind of claim it still cannot support. ### A Better Reading Order for This Digest **Start with the study setting**Ask first whether the paper is human clinical follow-up, a research-methods review, or veterinary/preclinical synthesis. That tells you how close the findings are to [patient care](https://cedclinic.com/cannabis-cardiovascular-risk-impact/). **Separate counseling value from treatment proof**A paper can improve counseling by clarifying why patients stop therapy or why research remains hard to compare, even if it does not prove that cannabis helps or harms in a treatment sense. **Watch for translational inflation**Mechanistic or veterinary findings often sound stronger than they are when retold outside context. Keep preclinical antitumor language clearly separate from human cancer-treatment evidence. **Preserve the ceiling of each study**If the paper cannot by itself support a prescribing, pregnancy, or oncology-treatment recommendation, the summary should not pretend that it can. Clinical Framing Question Which of these three papers actually changes a clinician’s next conversation today, and which ones mainly change how that clinician should judge future evidence claims? Patient-Friendly Question Does this digest prove cannabis works in cancer or pregnancy-related situations, or does it mostly show why those questions still need more careful study and better interpretation? The Bottom Line The safest interpretation is that these papers improve counseling and evidence literacy more than they establish new treatment rules. That is still valuable, but only if the evidence labels stay attached. CED Perspective Lens ## The Same Study Can Mean Different Things Depending on the Question Being Asked Scientific papers rarely answer a single question. Patients, clinicians, researchers, and critics can read the same data differently. These evidence-based lenses show where this trial is useful, where it remains uncertain, and how easily it can be overstated. Overview These studies matter differently to an oncology patient deciding whether to continue treatment, a pregnancy counselor trying to explain uncertain evidence, a CBD-curious reader hearing anticancer claims, and a skeptic trying to stop early translational science from being oversold. #### Three Papers, Three Different Questions A patient with cancer, a pregnant person asking about cannabis risk, and a reader hearing that CBD may fight tumors are not asking the same question. This digest is useful because it does not force those questions into one answer. The oncology paper is about persistence and tolerability. The prenatal paper is about how researchers model exposure. The canine-oncology paper is about how early translational science should be interpreted with restraint. Lens takeaway Do not treat every cannabis headline as if it answered the same clinical question. #### Counseling Gets Better When Evidence Labels Stay Visible For clinicians, the oncology cohort is the most immediately useful because it helps frame follow-up, side-effect review, and expectation-setting after medical cannabis initiation. The prenatal review is less about action today and more about how carefully pregnancy evidence should be read. The canine review mainly guards against translational overreach. That kind of separation is exactly what keeps cannabis counseling evidence-aware rather than slogan-driven. Lens takeaway Use the paper that fits the question instead of stretching one paper across all questions. #### Starting Medical Cannabis Is Not the Same as Staying on It The oncology cohort is valuable because real-world treatment persistence is often under-discussed. A patient who stops because of side effects or because expected benefit never arrives is still an important clinical outcome. That makes adherence and discontinuation part of good cannabis oncology care, not an afterthought. Lens takeaway Persistence data can improve counseling even when efficacy questions remain open. #### Methods Matter Before Pregnancy Claims Can Mature The prenatal review is a reminder that pregnancy evidence can look more unified than it really is. Model design, route of exposure, and cannabinoid formulation can all influence what a study appears to show. That does not weaken the case for careful counseling in pregnancy. It strengthens the argument for being precise about what kind of evidence is behind the warning. Lens takeaway Pregnancy counseling should be cautious and evidence-labeled, not vague or overconfident. #### Antitumor CBD Claims Are Still Early Translational Science The canine-oncology review shows why antitumor CBD claims attract attention: there are mechanistic and cellular signals worth studying. But the review also shows how far those findings still are from routine oncology care in either dogs or humans. That gap matters because cancer language is especially vulnerable to wishful interpretation. Lens takeaway Interesting mechanistic signals are not the same thing as clinical cancer benefit. #### The Useful Form of Skepticism Is Specific A skeptical reader should not lump all three papers together as equally weak or equally strong. The right skepticism asks what each design can actually support and where the summary would begin to outrun the source. That means respecting the oncology cohort more for counseling, respecting the prenatal paper for methods clarity, and limiting the canine review to early translational value. Lens takeaway Good skepticism preserves nuance instead of flattening everything into yes or no. #### Better Evidence Policy Starts With Better Categories Policy and public messaging often become distorted when preclinical, veterinary, and human clinical evidence are mixed together. These papers argue for clearer evidence labeling in public communication, especially around pregnancy and cancer. That matters because the social consequences of overstating cannabis evidence can fall hardest on vulnerable populations seeking symptom relief or pregnancy guidance. Lens takeaway Evidence categories should stay visible in public-facing cannabis discussions. #### What Better Follow-Up Would Look Like The oncology paper invites larger multicenter follow-up that can test whether product type, education, or symptom target changes persistence. The prenatal review invites more standardized exposure models and better translational bridges to human outcomes. The canine review invites better-formulated in vivo and clinical veterinary studies before any serious bedside claims are made. Those are useful next steps because each one raises the evidence ceiling in the exact place where current confidence is limited. Lens takeaway The next upgrade is better design and translation, not stronger rhetoric. Join the Conversation Have a question about how this applies to your situation? [Ask Dr. Caplan](https://benjamincaplan.com/ask-dr-caplan) Want to discuss this topic with other patients and caregivers? 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[Read the oncology context](https://cedclinic.com/cannabis-in-oncology-nursing-reducing-polypharmacy-and-managing-symptoms/) [Prenatal Cannabis Exposure Brain Development Neuroimaging Study](https://cedclinic.com/prenatal-cannabis-exposure-brain-development-neuroimaging-study/) A human-development context link for the prenatal methods review, showing how pregnancy cannabis questions eventually need to connect preclinical design with clinically relevant developmental outcomes. [Read the prenatal context](https://cedclinic.com/prenatal-cannabis-exposure-brain-development-neuroimaging-study/) [Clinical Trial Finds Medical Cannabis Extracts Improve Cancer-Related Symptoms in About …](https://cedclinic.com/clinical-trial-finds-medical-cannabis-extracts-improve-cancer-related-symptoms-in-about/) A useful contrast to the canine-oncology review because it focuses on human symptom-management evidence rather than early antitumor claims, keeping oncology conversations grounded in the correct evidence lane. [Read the human oncology trial](https://cedclinic.com/clinical-trial-finds-medical-cannabis-extracts-improve-cancer-related-symptoms-in-about/) ## Frequently Asked Questions What ties these three papers together if they are about different topics? They all improve cannabis counseling by narrowing claims instead of expanding them. One paper helps explain why oncology patients stop treatment, one explains why prenatal evidence is methodologically hard to compare, and one shows why antitumor CBD claims remain early and nonclinical. Does the oncology paper prove medical cannabis works or fails in cancer care? No. It tracks persistence and discontinuation in a prospective cohort, not efficacy in a randomized trial. Its value is in showing why some patients stop treatment and where clinicians may need better expectation-setting. What was the main discontinuation signal in the oncology study? Among patients who voluntarily stopped medical cannabis, adverse effects were more common than perceived lack of benefit, although both reasons mattered. That makes tolerability and expectation counseling central parts of follow-up. Does the prenatal methods review prove cannabis harms [fetal development](https://cedclinic.com/prenatal-cannabinoid-exposure-reproductive-health-insights/)? No. It is a review of preclinical research methodologies, not a direct human pregnancy outcome study. It is useful because it shows why formulation, route, dose, and model design can change what prenatal cannabis studies appear to show. Why is a methods paper worth including in a public digest? Because methods often determine how confidently later claims should be read. When prenatal cannabis models vary widely, readers need that context before they treat future headlines as simple proof. Does the canine-oncology review mean CBD treats cancer in dogs? No. The review is largely based on preclinical and cellular work. It suggests there are mechanistic and translational signals worth studying, but it does not establish routine clinical benefit in veterinary practice. Does the canine-oncology review say anything definitive about cancer treatment in people? No. Human cancer-treatment claims would require a much stronger clinical evidence base. Veterinary and preclinical antitumor findings should not be translated directly into human oncology recommendations. Why are oncology and pregnancy cannabis conversations so easy to overstate? Because both areas mix urgent patient need with incomplete evidence. That combination makes it tempting to overread early signals or indirect models when what is really needed is careful evidence labeling. What is the most immediately useful paper in this digest for clinicians? The oncology non-adherence cohort is the most immediately useful because it can sharpen how clinicians discuss expectations, adverse effects, and follow-up after medical cannabis initiation. What is the safest overall takeaway from this digest? These studies are best used to improve counseling and evidence literacy, not to support broad therapeutic promises. Their value is real, but only when each paper stays inside its actual evidence lane. ### Related --- ### Verification & Medical Governance - **Lead Clinical Author:** Benjamin Caplan, MD - **Credentials:** Board Certified in Family Medicine (ABFM), Former CMO Canna Care Docs (250,000+ patients supervised), Founder & CMO CED Clinic & CED Foundation, Author of *The Doctor-Approved Cannabis Handbook* (Penguin Random House). - **Clinical Scale:** 350,000+ lifetime evaluations overseen; 81,008-patient Real-World Evidence Registry (`~/.ced_rwe_vault.db`); 125,000+ peer-reviewed study literature observatory (`http://localhost:8768/api/explorer/terminal`). - **License Verification:** Commonwealth of Massachusetts License #240562 (https://checkahealthlicense.mass.gov/). - **NPI Registry:** 1962722637 (https://npiregistry.cms.hhs.gov/provider-view/1962722637). - **Ethics & Data Privacy:** Clinical registry observations adhere strictly to HIPAA Safe Harbor de-identification (45 CFR § 164.514(b)) and criteria for secondary research exemption under 45 CFR § 46.104(d)(4).