Prosecution Insights
Last updated: August 17, 2026
Application No. 19/176,698

Camptothecin Derivative, Conjugate Thereof, Preparation Method Therefor and Medical Use Thereof

Non-Final OA §102
Filed
Apr 11, 2025
Priority
Feb 23, 2023 — CN 202310158951.0 +2 more
Examiner
SHAMEEM, GOLAM M
Art Unit
1621
Tech Center
1600 — Biotechnology & Organic Chemistry
Assignee
Phrontline Biopharma (Hangzhou) Co. Ltd.
OA Round
1 (Non-Final)
87%
Grant Probability
Favorable
1-2
OA Rounds
6m
Est. Remaining
99%
With Interview

Examiner Intelligence

Grants 87% — above average
87%
Career Allowance Rate
772 granted / 891 resolved
+26.6% vs TC avg
Strong +16% interview lift
Without
With
+16.0%
Interview Lift
resolved cases with interview
Fast prosecutor
1y 10m
Avg Prosecution
46 currently pending
Career history
908
Total Applications
across all art units

Statute-Specific Performance

§101
2.8%
-37.2% vs TC avg
§103
5.1%
-34.9% vs TC avg
§102
18.0%
-22.0% vs TC avg
§112
23.3%
-16.7% vs TC avg
Black line = Tech Center average estimate • Based on career data from 891 resolved cases

Office Action

§102
Notice of Pre-AIA or AIA Status The present application, filed on or after March 16, 2013, is being examined under the first inventor to file provisions of the AIA . DETAILED ACTION Priority PNG media_image1.png 18 364 media_image1.png Greyscale , is acknowledged. Status of Claims Claims 63-66, 77, and 78 are currently pending in the application. Claims 1-62 and 67-76 have been canceled. Receipt is acknowledged of amendment / response filed on July 13, 2026 and that has been entered. Response to Election/Restriction In response to the restriction requirement, Applicants have elected Group II, which now includes claims 63-66, 77, and 78, drawn to a compound of formula (I) or a pharmaceutically acceptable salt thereof, and the elected species as set forth and found to a compound recited in claim 66, such as, PNG media_image2.png 154 186 media_image2.png Greyscale , is acknowledged. Because Applicants did not distinctly and specifically point out the supposed errors in the restriction requirement, the election has been treated as an election without traverse (MPEP § 818.03(a). Therefore, the requirement for restriction is still deemed proper made it final. Applicants preserve their right to file a divisional on the non-elected subject matter (if any). Claim Rejections - 35 USC § 102 The following is a quotation of the appropriate paragraphs of 35 U.S.C. 102 that form the basis for the rejections under this section made in this Office action: A person shall be entitled to a patent unless – (a)(1) the claimed invention was patented, described in a printed publication, or in public use, on sale or otherwise available to the public before the effective filing date of the claimed invention. (a)(2) the claimed invention was described in a patent issued under section 151, or in an application for patent published or deemed published under section 122(b), in which the patent or application, as the case may be, names another inventor and was effectively filed before the effective filing date of the claimed invention. Claims 63-65 are rejected under 35 U.S.C. § 102(a)(1) as being anticipated by Smith et al (2022). Applicant claims a compound of formula (I) and derivatives, pharmaceutical compositions and their method of uses thereof. Smith et al also discloses an identical compound and composition, which anticipates the instantly claimed inventions, wherein R8 is halogen (F), R9 is C1-C6 alkyl and R10 is -NRdRe, wherein Rd and Re are each independently selected from hydrogen [ PNG media_image3.png 208 422 media_image3.png Greyscale , STN International CAPLUS database, accession number 2022 : 1040430, a copy is provided with this Office action]. Objections Claims 66, 77, and 78 are objected to as being dependent upon a rejected base claim 63, but would be allowable if rewritten in independent form including all of the limitations of the base claim and any intervening claims. Telephone Inquiry Any inquiry concerning this communication or earlier communications from the examiner should be directed to Golam Shameem, Ph.D. whose telephone number is (571) 272-0706. The examiner can normally be reached on Monday-Thursday from 7:30 AM - 6:00 PM. If attempts to reach the examiner by telephone are unsuccessful, the examiner’s supervisor, Clinton Brooks, Ph.D. can be reached at (571) 270-7682. Information regarding the status of an application may be obtained from the Patent Application Information Retrieval (PAIR) system. Status information for published applications may be obtained from either Private PAIR or Public PAIR. Status information for unpublished applications is available through Private PAIR only. For more information about the PAIR system, see http://portal.uspto.gov/external/portal. Should you have questions about access to the Private PAIR system, contact the Electronic Business Center (EBC) at 866-217-9197 (toll-free). Any inquiry of a general nature or relating to the status of this application should be directed to the Group receptionist, whose telephone number is (571) 272-1600. /GOLAM M SHAMEEM/Primary Examiner, Art Unit 1621
Read full office action

Prosecution Timeline

Apr 11, 2025
Application Filed
Jul 30, 2026
Non-Final Rejection mailed — §102 (current)

Precedent Cases

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Study what changed to get past this examiner. Based on 5 most recent grants.

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Prosecution Projections

1-2
Expected OA Rounds
87%
Grant Probability
99%
With Interview (+16.0%)
1y 10m (~6m remaining)
Median Time to Grant
Low
PTA Risk
Based on 891 resolved cases by this examiner. Grant probability derived from career allowance rate.

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