Citius Pharmaceuticals, Inc.Lymphir (denileukin diftitox-cxdl) for injection

BLA 761312 COMPLETE RESPONSE

Citius Pharmaceuticals, Inc. Attention: Catherine Kessler Executive VP, Regulatory Affairs 11 Commerce Dr., 1‘ Floor Cranford, NJ 07016

Dear Ms. Kessler:

Please refer to your biologics license application (BLA) dated and received September 28, 2022, and your amendments, submitted under section 351 (a) of the Public Health Service Act for Lymphir (denileukin diftitox-cxdl) for injection.

We also acknowledge receipt of your amendment dated July 26, 2023, which was not reviewed for this action. You may incorporate applicable sections of the amendment by specific reference as part of your response to the deficiencies cited in this letter.

We have completed our review of this application, as amended, and have determined that we cannot approve this application in its present form. We have described our reasons for this action below and, where possible, our recommendations to address these issues.

PRODUCT QUALITY 1)

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(b) (4)

PRESCRIBING INFORMATION

Submit draft labeling that is responsive to our electronic communication dated July 14, 2023.

Prior to resubmitting the labeling, use the SRPI checklist to correct any formatting errors to ensure conformance with the format items in regulations and guidances. In addition, submit updated content of labeling [21 CFR 601.14(b) in structured product labeling (SPL) format as described at FDA.gov.'

To facilitate review of your submission, provide a highlighted or marked-up copy that shows all changes, as well as a clean Word version. The marked-up copy should include annotations that support any proposed changes.

Your proposed Prescribing Information (PI) must conform to the content and format regulations found at 21 CFR 201.56(a) and (d) and 201.57. As you develop your proposed PI, we encourage you to review the labeling review resources on the Prescription Drug Labeling Resources? and Pregnancy and Lactation Labeling Final Rule? websites, which include:

e The Final Rule (Physician Labeling Rule) on the content and format of the Pl for human drug and biological products.

e The Final Rule (Pregnancy and Lactation Labeling Rule) on the content and format of information in the PI on pregnancy, lactation, and females and

’ http:/Awww.fda.gow/ForIndustry/DataStandards/StructuredProductLabeling/default.htm

2 https://www.fda.gov/drugs/laws-acts-and-rules/prescription-drug-labeling-resources

3 https://www.fda.gov/drugs/labeling-information-drug-products/pregnancy-and-lactation-labeling-drugs- final-rule

U.S. Food and Drug Administration Silver Spring, MD 20993 www.fda.gov

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males of reproductive potential. e Regulations and related guidance documents. e Asample tool illustrating the format for Highlights and Contents.

e The Selected Requirements for Prescribing Information (SRPI) - a checklist of important format items from labeling regulations and guidances.

e FDA's established pharmacologic class (EPC) text phrases for inclusion in the Highlights Indications and Usage heading.

e Additional resources for the PI, patient labeling, and carton/container labeling.

CARTON AND CONTAINER LABELING

We reserve comment on the proposed labeling until the application is otherwise adequate.

PROPRIETARY NAME

Please refer to correspondence dated, March 24, 2023 which addresses the proposed proprietary name, Lymphir. This name was found acceptable pending approval of the application in the current review cycle. Please resubmit the proposed proprietary name when you respond to the application deficiencies.

FACILITY INSPECTIONS

An inspection of the O® (FEL # we

®®) facility is required before this application can be approved. FDA must assess the ability of that facility to conduct the listed manufacturing operations in compliance with CGMP. Due to the timing of incorporation of the site into the license application, we were unable to conduct an inspection during the current review cycle for your application.

SAFETY UPDATE

When you respond to the above deficiencies, include a safety update as described at 21 CFR 314.50(d)(5)(vi)(b). The safety update should include data from all nonclinical and clinical studies/trials of the product under consideration regardless of indication, dosage form, or dose level.

(1) Describe in detail any significant changes or findings in the safety profile.

(2) When assembling the sections describing discontinuations due to adverse events, serious adverse events, and common adverse events, incorporate new

U.S. Food and Drug Administration Silver Spring, MD 20993 www.fda.gov

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BLA 761312 Page 6 safety data as follows:

e Present new safety data from the studies/clinical trials for the proposed indication using the same format as in the original submission.

e Present tabulations of the new safety data combined with the original application data.

e Include tables that compare frequencies of adverse events in the original application with the retabulated frequencies described in the bullet above.

e For indications other than the proposed indication, provide separate tables for he frequencies of adverse events occurring in Clinical trials.

(3) Present a retabulation of the reasons for premature trial discontinuation by incorporating the drop-outs from the newly completed trials. Describe any new trends or patterns identified.

(4) Provide case report forms and narrative summaries for each subject who died during a Clinical trial or who did not complete a trial because of an adverse event. In addition, provide narrative summaries for serious adverse events.

(5) Describe any information that suggests a substantial change in the incidence of common, but less serious, adverse events between the new data and the original application data.

(6) Provide updated exposure information for the clinical studies/trials (e.g., number of subjects, person time).

(7) Provide a summary of worldwide experience on the safety of this product. Include an updated estimate of use for product marketed in other countries.

(8) Provide English translations of current approved foreign labeling not previously submitted.

ADDITIONAL COMMENTS

We have the following comments/recommendations that are not approvability issues:

1)

(b) (4)

2)

U.S. Food and Drug Administration Silver Spring, MD 20993 www.fda.gov

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(b) (4)

OTHER

Within one year after the date of this letter, you are required to resubmit or take other actions available under 21 CFR 601.3(b). If you do not take one of these actions, we

may consider your lack of response a request to withdraw the application under

21 CFR 601.3(c). You may also request an extension of time in which to resubmit the application.

A resubmission must fully address all the deficiencies listed in this letter and should be clearly marked with "RESUBMISSION" in large font, bolded type at the beginning of the cover letter of the submission. The cover letter should clearly state that you consider this resubmission a complete response to the deficiencies outlined in this letter. A partial response to this letter will not be processed as a resubmission and will not start a new review cycle.

You may request a meeting or teleconference with us to discuss what steps you need to take before the application may be approved. If you wish to have such a meeting, submit your meeting request as described in the draft guidance for industry Formal Meetings Between the FDA and Sponsors or Applicants of PDUFA Products.

The product may not be legally marketed until you have been notified in writing that this application is approved.

U.S. Food and Drug Administration Silver Spring, MD 20993 www.fda.gov

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If you have any questions, contact Ashlee Bow, Regulatory Project Manager, at

301-796-6716, or email ashlee.bow@fda.hhs.gov. Sincerely, {See appended electronic signature page}

Nicholas Richardson, DO, MPH

Deputy Division Director (Acting)

Division of Hematologic Malignancies II Office of Oncologic Diseases

Office of New Drugs

Center for Drug Evaluation and Research

U.S. Food and Drug Administration Silver Spring, MD 20993 www.fda.gov

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Signature Page 1 of 1

This is a representation of an electronic record that was signed electronically. Following this are manifestations of any and all electronic signatures for this electronic record.

NICHOLAS C RICHARDSON 07/28/2023 11:20:32 AM

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