A Phase 2 interventional study of Trastuzumab Deruxtecan (T-DXd) and Pyrotinib in Breast Cancer, sponsored by Fujian Medical University. Not yet recruiting at 1 site in China. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2026-09-23.
Sponsored by Fujian Medical University · Phase 2, Interventional, and Treatment
This is a single-arm, exploratory, phase II study evaluating the efficacy and safety of trastuzumab deruxtecan (T-DXd) in combination with pyrotinib in patients with HER2-positive advanced breast cancer whose disease has progressed after prior treatment with T-DXd.T-DXd is the established standard second-line therapy for HER2-positive advanced breast cancer. However, acquired resistance inevitably develops, and there is currently no approved standard treatment for patients progressing after T-DXd. Real-world studies report an objective response rate (ORR) of approximately 14.5% and a median progression-free survival of only 3 to 4 months in this setting, representing a major unmet medical need.Pyrotinib is an oral, irreversible pan-ErbB receptor tyrosine kinase inhibitor that potently inhibits HER1, HER2 and HER4 kinase activity and blocks downstream PI3K/AKT and MAPK signaling. Preclinical and clinical data (including the HER2CLIMB-02 and TROPHY studies) support the synergistic potential of combining an anti-HER2 antibody-drug conjugate with a tyrosine kinase inhibitor.Participants receive T-DXd 5.4 mg/kg intravenously on Day 1 of each 21-day cycle plus pyrotinib 320 mg orally once daily, continuously, until disease progression, unacceptable toxicity, withdrawal of consent, or other protocol-defined discontinuation criteria. Tumor response is assessed using RECIST v1.1.The primary endpoint is objective response rate (ORR). Secondary endpoints include disease control rate (DCR), duration of response (DoR), progression-free survival (PFS), overall survival (OS), and safety/tolerability. Approximately 28 participants will be enrolled.
HER2-positive breast cancer accounts for approximately 15-20% of all breast cancers and is characterized by high aggressiveness and a propensity for relapse and metastasis. The CLEOPATRA study established taxane plus trastuzumab and pertuzumab as the international first-line standard. For patients failing first-line therapy, trastuzumab deruxtecan (T-DXd, DS-8201) has become the globally accepted second-line standard. T-DXd is a next-generation HER2-directed antibody-drug conjugate composed of a humanized anti-HER2 monoclonal antibody, a cleavable tetrapeptide linker, and a topoisomerase I inhibitor payload (DXd), with a drug-to-antibody ratio of approximately 8. Its bystander effect enables activity against neighboring tumor cells with low or absent HER2 expression. In DESTINY-Breast03, T-DXd prolonged median progression-free survival from 6.8 months (T-DM1) to 28.8 months, reducing the risk of progression or death by 67%. Both the Chinese CSCO guidelines and major international guidelines recommend T-DXd as the highest-level second-line option.On August 12, 2026, based on the results of the DESTINY-Breast09 Phase III clinical trial, the indication of T-DXd for the first-line treatment of adult patients with unresectable or metastatic HER2-positive breast cancer was approved in China.Nevertheless, resistance to T-DXd is inevitable, and the population progressing after T-DXd continues to grow. No approved standard therapy and no high-level evidence exist for this setting. Across regimens including other ADCs, chemotherapy, HER2 monoclonal antibodies or TKIs, the ORR after T-DXd progression is approximately 14.5% with a median PFS of only 3-4 months. Real-world data show a median rwPFS of 4.7 months with tucatinib plus trastuzumab plus capecitabine and 2.6 months with sacituzumab govitecan. New clinical evidence is therefore urgently needed.
RATIONALE Mechanisms of T-DXd resistance are multifactorial and include reduced HER2 expression or altered HER2 binding, increased drug efflux (e.g., ABCC1 overexpression) and secondary genomic alterations (ERBB2, NFE2L2, KEAP1, TOP1). We hypothesize that combining T-DXd with pyrotinib may produce synergistic antitumor activity through: (1) complementary mechanisms providing vertical dual blockade of HER2 signaling (extracellular antibody-mediated payload delivery plus intracellular kinase inhibition); (2) suppression of bypass pathway activation such as PI3K/AKT, thereby reversing or circumventing resistance; (3) enhanced ADC cytotoxicity induced by TKI-mediated alteration of intracellular signaling and cell-cycle distribution; and (4) clinical precedent from the TROPHY study, in which T-DXd plus pyrotinib showed a favorable safety profile with the recommended pyrotinib dose established at 320 mg.
STUDY DESIGN This is an investigator-initiated, open-label, single-arm, exploratory phase II study conducted at Fujian Cancer Hospital. Approximately 28 evaluable participants will be enrolled. A Simon's minimax two-stage design is used, with a null hypothesis ORR of 14.5%, an alternative hypothesis ORR of 35%, a one-sided alpha of 0.05 and power of at least 80%. In stage 1, 15 participants will be evaluated; if 2 or fewer responses are observed the study will be stopped for futility, otherwise an additional 13 participants will be enrolled to a total of 28. If more than 7 responses are observed among the 28 participants, the regimen will be considered worthy of further investigation.
INTERVENTION
Treatment continues until radiographic or clinical disease progression, unacceptable toxicity, pregnancy, participant request, loss to follow-up, death, or investigator decision.
ASSESSMENTS Screening (within 28 days before the first dose; laboratory tests and 12-lead ECG within 7 days) includes demographics, medical and treatment history, ECOG performance status, vital signs, physical examination, hematology, serum chemistry, urinalysis, coagulation, thyroid/cardiac evaluation (echocardiography, LVEF), 12-lead ECG, virology (HBV, HCV, HIV), pregnancy testing, tumor markers (CEA, CA153, CA125, CA199) and imaging (CT/MRI of chest, abdomen, and pelvis; bone scan; brain imaging if clinically indicated).
During treatment, hematology, serum chemistry, urinalysis, ECOG assessment, vital signs, physical examination and 12-lead ECG are performed before each cycle; echocardiography, coagulation and urinalysis/stool tests every 2 cycles. Tumor imaging is performed at Cycles 3, 5 and 7 (3-5 days before Day 1) and every 3 cycles starting from Cycle 10 Day 1, with a window of ±7 days.
End-of-treatment visit occurs within 28 days after the last dose. Safety follow-up occurs 28±7 days after the last dose. Efficacy follow-up imaging is performed every 3 months in participants who discontinue for reasons other than progression or death. Survival follow-up is performed every 12 weeks (±7 days) to collect survival status and subsequent anticancer therapy.
STATISTICAL CONSIDERATIONS Efficacy analyses will be based on the Full Analysis Set (FAS), comprising all enrolled participants who receive at least one dose of study treatment (ITT principle); the Per-Protocol Set (PPS) will be used for sensitivity analyses. Safety analyses will be based on the Safety Set (SS), comprising all treated participants. Categorical variables including ORR and DCR will be summarized by frequency and percentage; the 95% CI for ORR will be calculated using the Clopper-Pearson exact method and for other categorical variables using the Wilson method. Time-to-event endpoints (PFS, OS, DoR) will be estimated by the Kaplan-Meier method, with medians and 95% CIs (Brookmeyer-Crowley). Adverse events will be graded according to NCI-CTCAE version 5.0.
14,825 studies on the registry are indexed under Breast Neoplasms; 3,319 are open to participants now.
This study's planned enrollment of 28 is below the median of 72 across 10,896 interventional studies indexed under Breast Neoplasms.
Browse Breast Neoplasms studies →Fujian Medical University is the lead sponsor of 148 studies on the registry; 52 are open to participants now.
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Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.
Adequate organ function as defined below, without transfusion or hematopoietic growth factor support within 14 days prior to the first dose:
a. ≥ 1.5 × 10\^9/L; b. count ≥ 100 × 10\^9/L; c. ≥ 80 g/L; d. Total ≤ 1.5 × ; e. and AST ≤ 2.5 × ULN within 7 days prior to the first dose (≤ 5 × ULN in patients with hepatic metastases); f. Serum creatinine ≤ 1.25 × ULN and ≥ 60 mL/min.
Exclusion Criteria:
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
The diagnosis was confirmed by looking at a sample under a microscope: tissue from a biopsy or surgery (histology), or cells from a fluid or needle sample (cytology).
Your pathology report is the document that shows this.
Cancer that has spread from where it began to other parts of the body. “Metastatic” cancer is cancer that has spread this way.
HER2 is a protein, made from the ERBB2 gene, that drives the growth of some cancers. A study may look for a level of the protein, extra copies of the gene, or a particular change in it.
In breast cancer, protein tests are read as HER2-positive, HER2-low or HER2-negative; other cancers use their own rules. Check which test result the study requires.
A line of therapy is one course of treatment, which may combine several drugs. First-line is the first course given; second-line follows when that stops working or is not tolerated.
“Two prior lines” means two courses that count separately under the study’s rules — not simply two drugs. Ask the study team if you are unsure how yours are counted.
The standard rules for measuring tumours on CT or MRI scans, to tell whether a cancer is shrinking, stable or growing during treatment.
“Measurable disease per RECIST 1.1” usually means at least one tumour 10 mm or more at its longest on a CT scan, or a lymph node 15 mm or more across its short axis.
The amount of disease can be tracked with a defined measurement, so the study can see whether it shrinks or grows. It might be a tumour measured on a scan or, in some blood cancers such as myeloma, a marker measured in blood or urine.
The criteria or the study team say which measurement counts — having no tumour visible on a scan does not by itself rule you out.
Cancer deposits in the brain from a cancer that started elsewhere in the body (CNS metastases include the spinal cord).
Studies differ: some leave out any brain metastases, some accept ones treated and stable for some weeks. Check what this study allows.
A planned gap after a treatment, so that its effects can lessen before the study treatment or a study assessment. Ask the study team and the doctor who prescribed it before changing any medicine.
A scale of how much an illness limits everyday activity. For people being assessed to join a study, scores run from 0 (fully active) to 4; lower is more active.
Studies most often ask for 0–1 or 0–2. Your doctor gives the score; the WHO scale uses the same steps. The full scale also has 5, which records death.
The study doctor’s estimate of how long someone is likely to live. Criteria use it so that people can stay in the study long enough for it to answer its question.
The number of neutrophils, white blood cells that help fight infection, in a given amount of blood. Too few raises the risk of infection.
It is a count, not a percentage of the white cells. Limits are written in units that mean the same: ≥ 1.5 × 10⁹/L is ≥ 1,500 per mm³ (µL). Each lab has its own reference range.
Blood cells that help blood clot. Too few raises the risk of bleeding and bruising. A usual adult range is about 150–400 × 10⁹/L (150,000–400,000 per µL); each lab has its own reference range.
The protein in red blood cells that carries oxygen. A low level is anaemia, which can cause tiredness and breathlessness. Measured in g/dL or g/L (9 g/dL is 90 g/L).
A yellow substance made when red blood cells are broken down, which the liver clears. A high level can mean a problem with the liver or the bile ducts.
Criteria often allow more for people with Gilbert’s syndrome, a harmless inherited condition that raises bilirubin.
The top of the normal range for a blood test, as set by the laboratory that runs it. Each lab prints its own range next to your result.
“≤ 2.5 × ULN” means the result can be up to two and a half times that top value.
Two enzymes measured in a routine blood test of the liver. Higher levels can mean the liver is under strain or damaged. SGPT and SGOT are older names for ALT and AST.
Criteria usually give a limit as a multiple of the upper limit of normal (ULN), often higher when cancer has spread to the liver.
How quickly the kidneys clear creatinine, a waste product, from the blood. A study may estimate it from a blood test with age, weight and sex (often by the Cockcroft–Gault formula), or measure it using blood and urine collected over a set time. Given in mL/min; higher is better.
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
An allergy, or another reaction of the immune system, to a substance. “Hypersensitivity to the study drug” means a known allergic reaction to it — not every side effect a medicine can have.
The other ingredients in a medicine besides the active drug, such as fillers, colours or preservatives.
Judged by the study doctor to matter for your health or for the study. It is a doctor’s decision, so ask the study team if you are unsure whether something counts.
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
A “mini-stroke”: temporary stroke-like symptoms caused by reduced blood flow to part of the brain, spinal cord or eye, without signs of a new stroke on a scan.
Stroke symptoms need emergency care at once, even if they go away.
The New York Heart Association’s four classes of how much heart failure limits physical activity.
Studies set their own limit — many outside heart failure leave out class III–IV, while heart failure studies may ask for a particular class. Check the class this study names.
On an ECG, the QT interval is the time the heart’s lower chambers take to activate electrically and recover in each beat. QTc is that time adjusted for heart rate (QTcF by Fridericia’s formula, QTcB by Bazett’s). Some medicines lengthen it, and a long QTc can raise the risk of a dangerous heart rhythm.
The study may name a correction formula and a limit in milliseconds, often around 450–480.
The human immunodeficiency virus, which weakens the immune system.
Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.
Hepatitis B is a virus that infects the liver. These are separate tests: HBsAg positive usually means a current infection (a recent vaccination can briefly cause it too); total anti-HBc (HBcAb) positive means an infection now or in the past; HBV DNA measures how much virus is in the blood.
Some studies accept a past infection if HBV DNA is undetectable, sometimes with antiviral medicine during the study. Check what this study allows.
Hepatitis C is a virus that infects the liver. An HCV antibody test can stay positive after an infection has cleared (and is occasionally positive without one); an HCV RNA test shows whether the virus is there now.
After treatment, hepatitis C counts as cured when HCV RNA is still undetectable 12 weeks or more after the treatment ended. Studies often accept people cured this way.
A drug or device being studied in a clinical trial.
It may be new, or already approved and being studied for another use, dose or form. Criteria often leave out people who took part in another study of one within a recent period, commonly 30 days or five half-lives.
Informed consent
Before you join, the study team explains what taking part involves — its purpose, what happens, the risks and possible benefits — and answers your questions, so you can decide freely. Consent is usually recorded on a form (the informed consent form, ICF) signed by you or, where the law allows, by someone legally authorised to decide for you.
You can keep asking questions during the study, you are told of new information that matters, and you can choose to leave at any time.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Histologically or cytologically confirmed
The diagnosis was confirmed by looking at a sample under a microscope: tissue from a biopsy or surgery (histology), or cells from a fluid or needle sample (cytology).
Your pathology report is the document that shows this.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Metastases
Cancer that has spread from where it began to other parts of the body. “Metastatic” cancer is cancer that has spread this way.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
HER2
HER2 is a protein, made from the ERBB2 gene, that drives the growth of some cancers. A study may look for a level of the protein, extra copies of the gene, or a particular change in it.
In breast cancer, protein tests are read as HER2-positive, HER2-low or HER2-negative; other cancers use their own rules. Check which test result the study requires.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Line of therapy
A line of therapy is one course of treatment, which may combine several drugs. First-line is the first course given; second-line follows when that stops working or is not tolerated.
“Two prior lines” means two courses that count separately under the study’s rules — not simply two drugs. Ask the study team if you are unsure how yours are counted.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
RECIST
The standard rules for measuring tumours on CT or MRI scans, to tell whether a cancer is shrinking, stable or growing during treatment.
“Measurable disease per RECIST 1.1” usually means at least one tumour 10 mm or more at its longest on a CT scan, or a lymph node 15 mm or more across its short axis.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Measurable disease
The amount of disease can be tracked with a defined measurement, so the study can see whether it shrinks or grows. It might be a tumour measured on a scan or, in some blood cancers such as myeloma, a marker measured in blood or urine.
The criteria or the study team say which measurement counts — having no tumour visible on a scan does not by itself rule you out.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Brain metastases
Cancer deposits in the brain from a cancer that started elsewhere in the body (CNS metastases include the spinal cord).
Studies differ: some leave out any brain metastases, some accept ones treated and stable for some weeks. Check what this study allows.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Washout period
A planned gap after a treatment, so that its effects can lessen before the study treatment or a study assessment. Ask the study team and the doctor who prescribed it before changing any medicine.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
ECOG performance status
A scale of how much an illness limits everyday activity. For people being assessed to join a study, scores run from 0 (fully active) to 4; lower is more active.
Studies most often ask for 0–1 or 0–2. Your doctor gives the score; the WHO scale uses the same steps. The full scale also has 5, which records death.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Life expectancy
The study doctor’s estimate of how long someone is likely to live. Criteria use it so that people can stay in the study long enough for it to answer its question.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Absolute neutrophil count (ANC)
The number of neutrophils, white blood cells that help fight infection, in a given amount of blood. Too few raises the risk of infection.
It is a count, not a percentage of the white cells. Limits are written in units that mean the same: ≥ 1.5 × 10⁹/L is ≥ 1,500 per mm³ (µL). Each lab has its own reference range.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Platelets
Blood cells that help blood clot. Too few raises the risk of bleeding and bruising. A usual adult range is about 150–400 × 10⁹/L (150,000–400,000 per µL); each lab has its own reference range.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Hemoglobin (Hb)
The protein in red blood cells that carries oxygen. A low level is anaemia, which can cause tiredness and breathlessness. Measured in g/dL or g/L (9 g/dL is 90 g/L).
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Bilirubin
A yellow substance made when red blood cells are broken down, which the liver clears. A high level can mean a problem with the liver or the bile ducts.
Criteria often allow more for people with Gilbert’s syndrome, a harmless inherited condition that raises bilirubin.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
ULN (upper limit of normal)
The top of the normal range for a blood test, as set by the laboratory that runs it. Each lab prints its own range next to your result.
“≤ 2.5 × ULN” means the result can be up to two and a half times that top value.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
ALT and AST (liver enzymes)
Two enzymes measured in a routine blood test of the liver. Higher levels can mean the liver is under strain or damaged. SGPT and SGOT are older names for ALT and AST.
Criteria usually give a limit as a multiple of the upper limit of normal (ULN), often higher when cancer has spread to the liver.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Creatinine clearance (CrCl)
How quickly the kidneys clear creatinine, a waste product, from the blood. A study may estimate it from a blood test with age, weight and sex (often by the Cockcroft–Gault formula), or measure it using blood and urine collected over a set time. Given in mL/min; higher is better.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Childbearing potential
Able to become pregnant: from the first period until menopause, unless permanently unable to through surgery (removal of the womb, or of both ovaries or both fallopian tubes).
Criteria for people of childbearing potential usually ask for a negative pregnancy test and for contraception during the study and for a time after it.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Contraception
Ways of preventing pregnancy. “Highly effective” methods fail less than 1% of the time a year when used correctly — for example an IUD or an implant.
Criteria usually say which methods count and how long to keep using them after the last dose, sometimes for male participants too. Some studies accept a partner’s vasectomy if it was confirmed successful and that person is the participant’s only sexual partner.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Hypersensitivity
An allergy, or another reaction of the immune system, to a substance. “Hypersensitivity to the study drug” means a known allergic reaction to it — not every side effect a medicine can have.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Excipients
The other ingredients in a medicine besides the active drug, such as fillers, colours or preservatives.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Clinically significant
Judged by the study doctor to matter for your health or for the study. It is a doctor’s decision, so ask the study team if you are unsure whether something counts.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Corticosteroids (steroids)
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
TIA (transient ischaemic attack)
A “mini-stroke”: temporary stroke-like symptoms caused by reduced blood flow to part of the brain, spinal cord or eye, without signs of a new stroke on a scan.
Stroke symptoms need emergency care at once, even if they go away.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
NYHA class (heart failure)
The New York Heart Association’s four classes of how much heart failure limits physical activity.
Studies set their own limit — many outside heart failure leave out class III–IV, while heart failure studies may ask for a particular class. Check the class this study names.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
QT and QTc
On an ECG, the QT interval is the time the heart’s lower chambers take to activate electrically and recover in each beat. QTc is that time adjusted for heart rate (QTcF by Fridericia’s formula, QTcB by Bazett’s). Some medicines lengthen it, and a long QTc can raise the risk of a dangerous heart rhythm.
The study may name a correction formula and a limit in milliseconds, often around 450–480.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
HIV
The human immunodeficiency virus, which weakens the immune system.
Many studies now accept people whose HIV is controlled on treatment, judged by the viral load and the CD4 count. Check the limits this study sets.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Hepatitis B tests
Hepatitis B is a virus that infects the liver. These are separate tests: HBsAg positive usually means a current infection (a recent vaccination can briefly cause it too); total anti-HBc (HBcAb) positive means an infection now or in the past; HBV DNA measures how much virus is in the blood.
Some studies accept a past infection if HBV DNA is undetectable, sometimes with antiviral medicine during the study. Check what this study allows.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Hepatitis C tests
Hepatitis C is a virus that infects the liver. An HCV antibody test can stay positive after an infection has cleared (and is occasionally positive without one); an HCV RNA test shows whether the virus is there now.
After treatment, hepatitis C counts as cured when HCV RNA is still undetectable 12 weeks or more after the treatment ended. Studies often accept people cured this way.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Investigational drug or device
A drug or device being studied in a clinical trial.
It may be new, or already approved and being studied for another use, dose or form. Criteria often leave out people who took part in another study of one within a recent period, commonly 30 days or five half-lives.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Trastuzumab Deruxtecan (T-DXd): Intravenous infusion at 5.4 mg/kg on Day 1 of each 21-day cycle. The first infusion is administered over not less than 90 minutes; if well tolerated, subsequent infusions may be shortened to approximately 30 minutes. Protocol-defined dose reduction levels are 4.4 mg/kg (first reduction) and 3.2 mg/kg (second reduction); further reduction requires treatment discontinuation. Pyrotinib:Oral tablet, 320 mg once daily on a continuous schedule, taken with or immediately after a meal. A single dose reduction to 240 mg once daily is permitted for toxicity management; multiple interruptions and dose adjustments are allowed.
Drug: Trastuzumab Deruxtecan (T-DXd) · Drug: Pyrotinib
Intravenous infusion at 5.4 mg/kg on Day 1 of each 21-day cycle. The first infusion is administered over not less than 90 minutes; if well tolerated, subsequent infusions may be shortened to approximately 30 minutes. Protocol-defined dose reduction levels are 4.4 mg/kg (first reduction) and 3.2 mg/kg (second reduction); further reduction requires treatment discontinuation.
Oral tablet, 320 mg once daily on a continuous schedule, taken with or immediately after a meal. A single dose reduction to 240 mg once daily is permitted for toxicity management; multiple interruptions and dose adjustments are allowed.
The objective response rate（ORR） was evaluated according to the RECIST v1.1 standard
Time frame: 3 years
The Disease Control Rate (DCR) was evaluated according to the RECIST v1.1 standard
Time frame: 3 years
progression-free survival (PFS)
Time frame: 3 years
Overall Survival (OS)
Time frame: 3 years
The safety was according to the classification standard of drug AE in NCI-CTCAE 5.0
Time frame: 3 years
Plan to share: Yes
Supporting information: Study protocol
No publications or documents are linked to this record.
Start is estimated for Oct 2026; primary completion for Oct 2028, 24 months later.
Of 1,070 non-industry phase 2 interventional studies under Breast Neoplasms, half reached primary completion within 56 months of starting (the median), counting those still running; a quarter within 34 and three quarters within 87. This study's planned 24 months is below that.
Counting every sponsor, half of 1,302 studies reached it within 51 months; a quarter within 30 and three quarters within 82.
How these figures are worked out, and which studies are left out of them.
This study is not yet recruiting, as verified in Sep 2026. You cannot join it, but the record below documents what was studied.
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Studies of the drug tested here: Pyrotinib