Prosecution Insights
Last updated: July 17, 2026
Application No. 18/240,392

EXATECAN-DERIVED TOPOISOMERASE-1 INHIBITORS PHARMACEUTICAL COMPOSITIONS, AND USES THEREOF

Non-Final OA §102§103§112
Filed
Aug 31, 2023
Priority
Sep 02, 2022 — provisional 63/403,515 +2 more
Examiner
SHIM, DAVID M.
Art Unit
1626
Tech Center
1600 — Biotechnology & Organic Chemistry
Assignee
Merck Sharp & Dohme LLC
OA Round
3 (Non-Final)
58%
Grant Probability
Moderate
3-4
OA Rounds
0m
Est. Remaining
99%
With Interview

Examiner Intelligence

Grants 58% of resolved cases
58%
Career Allowance Rate
51 granted / 88 resolved
-2.0% vs TC avg
Strong +56% interview lift
Without
With
+55.9%
Interview Lift
resolved cases with interview
Typical timeline
2y 11m
Avg Prosecution
63 currently pending
Career history
126
Total Applications
across all art units

Statute-Specific Performance

§101
1.5%
-38.5% vs TC avg
§103
59.1%
+19.1% vs TC avg
§102
13.1%
-26.9% vs TC avg
§112
19.7%
-20.3% vs TC avg
Black line = Tech Center average estimate • Based on career data from 88 resolved cases

Office Action

§102 §103 §112
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 Claims 23-37 are pending in the application. Claims 23-37 are rejected. Claim 37 is objected to. Continued Examination Under 37 CFR 1.114 A request for continued examination under 37 CFR 1.114, including the fee set forth in 37 CFR 1.17(e), was filed in this application after final rejection. Since this application is eligible for continued examination under 37 CFR 1.114, and the fee set forth in 37 CFR 1.17(e) has been timely paid, the finality of the previous Office action has been withdrawn pursuant to 37 CFR 1.114. Applicant's submission filed on May 18, 2026 has been entered. Priority This application claims benefit of Provisional Application No. 63/488,007, filed on March 2, 2023, which claims benefit of Provisional Application No. 63/421,844, filed on November 2, 2022, which claims benefit of Provisional Application No. 63/403,515, filed on September 2, 2022. Restriction As indicated previously, pursuant to MPEP § 803.02, the Markush claims that read on Applicant’s elected species (structure shown below) were examined fully with respect to the elected species. PNG media_image1.png 209 234 media_image1.png Greyscale Upon examination, the elected species was found to be anticipated or rendered obvious by prior art; therefore, the Markush claim and claims to the elected species was rejected. The claim(s) and subject matter that did not read on the elected species were NOT examined and searched and were withdrawn from further consideration by the examiner. Accordingly, the search and examination was extended to include the following compounds: PNG media_image2.png 217 369 media_image2.png Greyscale PNG media_image3.png 255 247 media_image3.png Greyscale PNG media_image4.png 259 246 media_image4.png Greyscale . In response to Applicant’s amendments, filed on May 18, 2026, the Examiner has extended the search and examination to further include the following compounds: PNG media_image5.png 534 586 media_image5.png Greyscale and PNG media_image6.png 486 590 media_image6.png Greyscale . Response to Amendments Objections and rejections made in the Office Action mailed February 25, 2026 that do not appear below have been overcome by Applicant’s amendments to the claims and have been withdrawn. Claim Objections Claim 37 is objected to because of the following informalities: Claim 37 should be amended to replace “a compound of claim 23” with -the compound of claim 23- for sake of consistency. Appropriate correction is required. Claim Rejections - 35 USC § 112(b) The following is a quotation of 35 U.S.C. § 112(b): (b) CONCLUSION — The specification shall conclude with one or more claims particularly pointing out and distinctly claiming the subject matter which the inventor or a joint inventor regards as the invention. The following is a quotation of 35 U.S.C. § 112 (pre-AIA ), second paragraph: The specification shall conclude with one or more claims particularly pointing out and distinctly claiming the subject matter which the applicant regards as his invention. Claims 23-33 and 37 are rejected under 35 U.S.C. § 112(b) or 35 U.S.C. § 112 (pre-AIA ), second paragraph, as being indefinite for failing to particularly point out and distinctly claim the subject matter which the inventor or a joint inventor (or for applications subject to pre-AIA 35 U.S.C. § 112, the applicant), regards as the invention. Claim 23 recites the expression “compound having a structural Formula I” and is rejected as indefinite. The term “having” is open-ended; therefore, it is unclear what additional, unrecited elements- if any- Applicant intended the claim to encompass. It is suggested Applicant replace the aforementioned open-ended expression with a closed-ended transitional phrase which limits the claim to the recited Formula I. Dependent claims 24-33 and 37 do not correct this issue of indefiniteness and are hence rejected. 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. (1 of 3) Claims 23-31 and 34-37 are rejected under 35 U.S.C. § 102(a)(1) and 35 U.S.C. § 102(a)(2) as being anticipated by Tian et al. (PCT Publication No. WO 2022/166762 A1; August 11, 2022). Tian et al. teach Compound 1-10-2 having the following chemical structure (see e.g., page 99): PNG media_image5.png 534 586 media_image5.png Greyscale . Regarding instant claims 23-26, 29-31 and 34, the above prior art compound is encompassed by variable definitions of the instantly claimed compound having a structural Formula I, wherein Rj represents hydrogen; Rk is PNG media_image7.png 93 108 media_image7.png Greyscale , further wherein R2 is hydrogen; R3 is OH; and R4 is –(CH2)nNH2 where n is 1. Regarding instant claims 27-31 and 34, the above prior art compound is encompassed by variable definitions of the instantly claimed compound having a structural Formula I, wherein Rj represents hydrogen; Rk is PNG media_image7.png 93 108 media_image7.png Greyscale , further wherein R2 is OH; R3 is hydrogen; and R4 is –(CH2)nNH2 where n is 1. Regarding instant claim 35, the above prior art compound corresponds to at least the following (i.e., the first compound as recited on page 12 of the claims filed on May 18, 2026): PNG media_image8.png 97 908 media_image8.png Greyscale . Regarding instant claim 36, the above prior art compound corresponds to at least the following (i.e., the second compound as recited on page 24 of the claims filed on May 18, 2026): PNG media_image9.png 251 252 media_image9.png Greyscale . Regarding instant claim 37, the prior art teaches pharmaceutical compositions comprising one or more pharmaceutically acceptable carriers. See e.g., page 174 of attached machine translation. (2 of 3) Claims 23-28 and 30-32 are rejected under 35 U.S.C. § 102(a)(1) and 35 U.S.C. § 102(a)(2) as being anticipated by Chinese Application No. CN111689980A (September 22, 2020). The prior art teaches the following chemical compound (see e.g., page 3): PNG media_image10.png 239 284 media_image10.png Greyscale . Regarding instant claims 23-28, 30 and 32, the above prior art compound is encompassed by variable definitions of the instantly claimed compound having a structural Formula I, wherein Rj represents hydrogen; Rk is PNG media_image7.png 93 108 media_image7.png Greyscale , further wherein R2 is -C1 alkyl; R3 is OH; and R4 is -C1 alkyl. Regarding instant claims 23-28 and 30-32, the above prior art compound is encompassed by variable definitions of the instantly claimed compound having a structural Formula I, wherein Rj represents hydrogen; Rk is PNG media_image7.png 93 108 media_image7.png Greyscale , further wherein R2 is -C1 alkyl; R3 is -C1 alkyl; and R4 is OH. (3 of 3) Claim 36 is rejected under 35 U.S.C. § 102(a)(2) as being anticipated by PCT Publication No. WO 2022/236136 A1 (claims priority to Provisional Application No. 63/185,736 filed on May 7, 2021). The prior art teaches Compound 6 having the following chemical structure (see e.g., page 26 and also seventh compound as disclosed in paragraph [0057] of 63/185,736): PNG media_image11.png 259 246 media_image11.png Greyscale . Regarding instant claim 36, the above prior art Compound 6 corresponds to the second compound as recited on page 16 of the claims filed on May 18, 2026. Claim Rejections - 35 USC § 103 The following is a quotation of 35 U.S.C. § 103 which forms the basis for all obviousness rejections set forth in this Office action: A patent for a claimed invention may not be obtained, notwithstanding that the claimed invention is not identically disclosed as set forth in section 102, if the differences between the claimed invention and the prior art are such that the claimed invention as a whole would have been obvious before the effective filing date of the claimed invention to a person having ordinary skill in the art to which the claimed invention pertains. Patentability shall not be negated by the manner in which the invention was made. The factual inquiries for establishing a background for determining obviousness under 35 U.S.C. § 103 are summarized as follows: 1. Determining the scope and contents of the prior art. 2. Ascertaining the differences between the prior art and the claims at issue. 3. Resolving the level of ordinary skill in the pertinent art. 4. Considering objective evidence present in the application indicating obviousness or nonobviousness. Claims 33 is rejected under 35 U.S.C. § 103 as being unpatentable over Chinese Application No. CN111689980A (September 22, 2020). Determining the scope and contents of the prior art (See MPEP § 2141.01) Regarding instant claim 33, the prior art teaches the following chemical compound (see e.g., page 3): PNG media_image10.png 239 284 media_image10.png Greyscale . The above prior art compound is encompassed by variable definitions of the instantly claimed compound having a structural Formula I, wherein Rj represents hydrogen; Rk is PNG media_image7.png 93 108 media_image7.png Greyscale , further wherein R2 is -C1 alkyl; R3 is OH; and R4 is -C1 alkyl (i.e., -CH3). Ascertainment of the differences between the prior art and the claims (See MPEP § 2141.02) Regarding instant claim 33, the prior art teaches the position corresponding to instant variable R4 is -CH3 in the above prior art compound (i.e., the prior art compound does not read on the R4 variable definitions required by instant claim 33). However, the broadest disclosure of the prior art invention corresponds to the following genus (see e.g., prior art claim 1) which encompasses the instantly claimed Formula I: PNG media_image12.png 856 794 media_image12.png Greyscale Moreover, the above prior art genus provides for prior art variables R1 and R2 (which corresponds to the position for instant variable R4) as being defined as inter alia a C1 alkyl or -CF3. Finding of prima facie obviousness --- rationale and motivation (See MPEP § 2142-2143) Therefore, it would have been obvious to a person of ordinary skill in the art to substitute a prior art R1/R2 variable (i.e., methyl) of PNG media_image10.png 239 284 media_image10.png Greyscale with a -CF3 to result in the following structure: PNG media_image13.png 486 590 media_image13.png Greyscale . The above structure is encompassed by instant claim 33, wherein Rj is hydrogen; Rk is PNG media_image7.png 93 108 media_image7.png Greyscale , and R2 is -C1 alkyl; R3 is OH; and R4 is -C1haloalkyl (i.e., -CF3). At least in the interest of providing additional compounds for downstream application(s), a person of ordinary skill in the art would have been motivated to arrive at the instantly claimed invention. Conclusion No claims are allowed. Any inquiry concerning this communication or earlier communications from the examiner should be directed to DAVID SHIM whose telephone number is (571)270-1205. The examiner can normally be reached Monday - Friday, 9 AM - 5 PM EST. Examiner interviews are available via telephone, in-person, and video conferencing using a USPTO supplied web-based collaboration tool. To schedule an interview, applicant is encouraged to use the USPTO Automated Interview Request (AIR) at http://www.uspto.gov/interviewpractice. If attempts to reach the examiner by telephone are unsuccessful, the examiner’s supervisor, RENEE CLAYTOR can be reached at (571)272-8394. The fax phone number for the organization where this application or proceeding is assigned is 571-273-8300. Information regarding the status of published or unpublished applications may be obtained from Patent Center. Unpublished application information in Patent Center is available to registered users. To file and manage patent submissions in Patent Center, visit: https://patentcenter.uspto.gov. Visit https://www.uspto.gov/patents/apply/patent-center for more information about Patent Center and https://www.uspto.gov/patents/docx for information about filing in DOCX format. For additional questions, contact the Electronic Business Center (EBC) at 866-217-9197 (toll-free). If you would like assistance from a USPTO Customer Service Representative, call 800-786-9199 (IN USA OR CANADA) or 571-272-1000. /D.M.S./Examiner, Art Unit 1626 /REBECCA L ANDERSON/Primary Examiner, Art Unit 1626
Read full office action

Prosecution Timeline

Aug 31, 2023
Application Filed
Nov 19, 2025
Non-Final Rejection mailed — §102, §103, §112
Jan 16, 2026
Response Filed
Feb 25, 2026
Final Rejection mailed — §102, §103, §112
Mar 18, 2026
Response after Non-Final Action
May 18, 2026
Request for Continued Examination
May 19, 2026
Response after Non-Final Action
Jul 06, 2026
Non-Final Rejection mailed — §102, §103, §112 (current)

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

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Prosecution Projections

3-4
Expected OA Rounds
58%
Grant Probability
99%
With Interview (+55.9%)
2y 11m (~0m remaining)
Median Time to Grant
High
PTA Risk
Based on 88 resolved cases by this examiner. Grant probability derived from career allowance rate.

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