A Study of JNJ-95597528 in Participants With Inadequately Controlled Moderate to Severe Asthma

Prior treatment

• Participants with either of the following events within the 2 weeks prior to the screening visit: a. Treatment with systemic steroids (oral or parenteral) for worsening asthma, b. Hospitalization or an emergency medical care visit for worsening asthma

Other illness

• History of uncontrolled, significant renal, cardiac, vascular, pulmonary (other than asthma), gastrointestinal, endocrine, neurologic, hematologic, rheumatologic, psychiatric, or metabolic disturbances that makes the participant unsuitable for the trial per investigator judgment
• Experienced primary efficacy failure (no response within 16 weeks) or an adverse event (AE) requiring discontinuation related to agents inhibiting interleukin (IL)-13, IL-4Rα, and IL-4 signaling

Lab values

• Any clinically important pulmonary disease other than asthma or pulmonary or systemic diseases, other than asthma, that are associated with elevated peripheral eosinophil counts

Other

• Current smokers or former smokers with a smoking history \>=20 pack-years. Former smokers must have stopped smoking within 6 months of the screening visit. This includes participants using vaping products and e-cigarettes

• Medically stable on the basis of physical examination, medical history, and vital signs performed at screening or at baseline
• Confirmed variable expiratory flow (1 or more of the following) per global initiative for asthma (GINA) 2025 at the baseline visit: a. Evidence of bronchodilator responsiveness at screening and baseline: Post-bronchodilator forced expiratory volume in 1 second (FEV1) increases by greater than or equal to (\>=) 200 milliliter (mL) and \>=12 percent (%) of pre- bronchodilator value, or increase in peak expiratory flow (PEF) \>=20%, if spirometry is not available; b. Demonstrated increase in lung function within the past 3 years after \>=4 weeks of daily inhaled corticosteroids (ICS)-containing treatment, shown by: increase from baseline FEV1 by \>=12% and \>=200 mL, or increase in PEF by \>=20%; c. Positive bronchial provocation test within the past 3 years, as defined by: \>=20% decrease from baseline in FEV1 with standard doses of methacholine, or \>=15% decrease from baseline in FEV1 with standardized hyperventilation, hypertonic saline or mannitol challenge, or decrease from baseline in FEV1 of \>10% and \>200 mL with standardized exercise challenge
• Inhaled corticosteroid: Prescribed medium- or high-dose ICS for at least 1 year and a stable dose of medium- or high-dose ICS for at least 3 months prior to the screening visit per GINA 2025: • High-dose ICS is defined as a total daily dose \>=500 microgram (mcg) fluticasone propionate or equivalent, • Medium-dose ICS is defined as a total daily dose \>=250 to 500 mcg fluticasone propionate or equivalent
• Additional controller medication: Must be on a stable dose of at least 1 additional maintenance asthma controller, in addition to ICS, per GINA 2025, for at least 3 months prior to screening (for example, long-acting beta-agonist \[LABA\], long-acting muscarinic antagonist \[LAMA\] \[can be combined with ICS in 1 inhaler or can be separate inhalers\], leukotriene receptor antagonist \[LTRA\])
• Asthma control questionnaire, 5-item (ACQ-5) score \>=1.5 at the screening visit and the baseline visit