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A Patient with Adenocarcinoma Stomach on FLOT (5-Fluorouracil/Leucovorin, Oxaliplatin, and Docetaxel) Chemotherapy Presents with Tooth Discoloration: Spot the Diagnosis

CC BY 4.0 · Indian J Med Paediatr Oncol 2026; 47(01): 070-071

DOI: DOI: 10.1055/s-0045-1813664

Author : Mayank Kapoor,? Deepak Sundriyal, Amit Sehrawat.

Description

A male in his 70s, with no known comorbidities or history of substance abuse, presented with complaints of abdominal discomfort and dyspepsia. Despite being prescribed proton pump inhibitors, his symptoms persisted. An upper gastrointestinal endoscopy revealed a gastric ulcer. Histopathological examination of the biopsy confirmed a diagnosis of moderately differentiated adenocarcinoma stomach. A positron emission tomography PET scan showed hypermetabolic, asymmetrical, circumferential wall nodular thickening involving the medial wall of the antropyloric region of the stomach, along with hypermetabolic enlarged perigastric lymph nodes. The patient was started on perioperative chemotherapy as per the FLOT (5-fluorouracil/leucovorin, oxaliplatin, and docetaxel) protocol. After completion of four cycles of chemotherapy, he underwent surgery. He was then started on postoperative adjuvant chemotherapy.

Following six cycles of chemotherapy, discoloration of the patient's teeth was observed. Specifically, yellow-black discoloration was noted on the lower teeth, and yellowish discoloration on the upper incisors ([Fig. 1]) of the patient. The patient was not taking any additional medications and denied any history of tobacco use. What can be the differential diagnosis?


  Fig 1: Left: presence of yellow-black discoloration in the lower teeth (arrowhead). Right: yellowish discoloration in the upper incisors (arrowhead).


After completion of a total of eight cycles of chemotherapy as planned, he was then advised to have 3 monthly follow-up. At his 3-month review, the discoloration had partially resolved, implying chemotherapy to be the causative agent. ([Fig. 2]) While chemotherapy-induced tooth discoloration has been previously reported, such occurrences remain relatively rare.[1] [2] [3] Discoloration of teeth and enamel hypoplasia may result from chemotherapeutic agents like vincristine, vinblastine, and cyclophosphamide, which can interfere with ameloblast activity, particularly by disrupting their microtubule-dependent calcium transport systems.[4] This is a rare case of FLOT chemotherapy-induced tooth discoloration. Clinicians must remain vigilant for this adverse effect while administering this chemotherapy regimen to patients.


 Fig 2 : Left: showing resolution of discoloration in the lower teeth 3 months post last chemotherapy. Right: showing resolution of yellowish discoloration in the upper incisors 3 months post last chemotherapy.


Patient Consent

Patient consent has been taken for this article.

Publication History

Article published online:
01 December 2025

© 2025. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution License, permitting unrestricted use, distribution, and reproduction so long as the original work is properly cited. (https://creativecommons.org/licenses/by/4.0/)

Thieme Medical and Scientific Publishers Pvt. Ltd.
A-12, 2nd Floor, Sector 2, Noida-201301 UP, India

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Description

A male in his 70s, with no known comorbidities or history of substance abuse, presented with complaints of abdominal discomfort and dyspepsia. Despite being prescribed proton pump inhibitors, his symptoms persisted. An upper gastrointestinal endoscopy revealed a gastric ulcer. Histopathological examination of the biopsy confirmed a diagnosis of moderately differentiated adenocarcinoma stomach. A positron emission tomography PET scan showed hypermetabolic, asymmetrical, circumferential wall nodular thickening involving the medial wall of the antropyloric region of the stomach, along with hypermetabolic enlarged perigastric lymph nodes. The patient was started on perioperative chemotherapy as per the FLOT (5-fluorouracil/leucovorin, oxaliplatin, and docetaxel) protocol. After completion of four cycles of chemotherapy, he underwent surgery. He was then started on postoperative adjuvant chemotherapy.

Following six cycles of chemotherapy, discoloration of the patient's teeth was observed. Specifically, yellow-black discoloration was noted on the lower teeth, and yellowish discoloration on the upper incisors ([Fig. 1]) of the patient. The patient was not taking any additional medications and denied any history of tobacco use. What can be the differential diagnosis?


  Fig 1: Left: presence of yellow-black discoloration in the lower teeth (arrowhead). Right: yellowish discoloration in the upper incisors (arrowhead).


After completion of a total of eight cycles of chemotherapy as planned, he was then advised to have 3 monthly follow-up. At his 3-month review, the discoloration had partially resolved, implying chemotherapy to be the causative agent. ([Fig. 2]) While chemotherapy-induced tooth discoloration has been previously reported, such occurrences remain relatively rare.[1] [2] [3] Discoloration of teeth and enamel hypoplasia may result from chemotherapeutic agents like vincristine, vinblastine, and cyclophosphamide, which can interfere with ameloblast activity, particularly by disrupting their microtubule-dependent calcium transport systems.[4] This is a rare case of FLOT chemotherapy-induced tooth discoloration. Clinicians must remain vigilant for this adverse effect while administering this chemotherapy regimen to patients.



 Fig 2 : Left: showing resolution of discoloration in the lower teeth 3 months post last chemotherapy. Right: showing resolution of yellowish discoloration in the upper incisors 3 months post last chemotherapy.


Acknowledgment

The manuscript has been read and approved by all the authors, and the requirements for authorship as stated earlier in this document have been met, and each author believes that the manuscript represents honest work.

Patient Consent

Patient consent has been taken for this article.


    References

  1. Busenhart DM, Erb J, Rigakos G, Eliades T, Papageorgiou SN. Adverse effects of chemotherapy on the teeth and surrounding tissues of children with cancer: a systematic review with meta-analysis. Oral Oncol 2018; 83: 64-72
    Crossref PubMed Search in Google Scholar
  2. Poulopoulos A, Papadopoulos P, Andreadis D. Chemotherapy: oral side effects and dental interventions -a review of the literature. Stomatol Dis Sci 2017; 1: 35-49
    Search in Google Scholar
  3. Oral Complications of Chemotherapy and Head/Neck Radiation. (PDQ)–Patient Version - NCI. May 23, 2022. Accessed February 24, 2023 at:  https://www.cancer.gov/about-cancer/treatment/side-effects/mouth-throat/oral-complications-pdq
  4. Oğuz A, Cetiner S, Karadeniz C, Alpaslan G, Alpaslan C, Pinarli G. Long-term effects of chemotherapy on orodental structures in children with non-Hodgkin's lymphoma. Eur J Oral Sci 2004; 112 (01) 8-11
    Crossref PubMed Search in Google Scholar

Address for correspondence

Mayank Kapoor, MBBS, MD
Department of Medical Oncology, Hematology, All India Institute of Medical Sciences (AIIMS)
Rishikesh, Uttarakhand 249203
India   

Publication History

Article published online:
01 December 2025

© 2025. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution License, permitting unrestricted use, distribution, and reproduction so long as the original work is properly cited. (https://creativecommons.org/licenses/by/4.0/)

Thieme Medical and Scientific Publishers Pvt. Ltd.
A-12, 2nd Floor, Sector 2, Noida-201301 UP, India

Address for correspondence

Mayank Kapoor, MBBS, MD
Department of Medical Oncology, Hematology, All India Institute of Medical Sciences (AIIMS)
Rishikesh, Uttarakhand 249203
India   

Publication History

Article published online:
01 December 2025

© 2025. The Author(s). This is an open access article published by Thieme under the terms of the Creative Commons Attribution License, permitting unrestricted use, distribution, and reproduction so long as the original work is properly cited. (https://creativecommons.org/licenses/by/4.0/)

Thieme Medical and Scientific Publishers Pvt. Ltd.
A-12, 2nd Floor, Sector 2, Noida-201301 UP, India

We recommend

  Fig 1: Left: presence of yellow-black discoloration in the lower teeth (arrowhead). Right: yellowish discoloration in the upper incisors (arrowhead).


 Fig 2 : Left: showing resolution of discoloration in the lower teeth 3 months post last chemotherapy. Right: showing resolution of yellowish discoloration in the upper incisors 3 months post last chemotherapy.

    References

  1. Busenhart DM, Erb J, Rigakos G, Eliades T, Papageorgiou SN. Adverse effects of chemotherapy on the teeth and surrounding tissues of children with cancer: a systematic review with meta-analysis. Oral Oncol 2018; 83: 64-72
    Crossref PubMed Search in Google Scholar
  2. Poulopoulos A, Papadopoulos P, Andreadis D. Chemotherapy: oral side effects and dental interventions -a review of the literature. Stomatol Dis Sci 2017; 1: 35-49
    Search in Google Scholar
  3. Oral Complications of Chemotherapy and Head/Neck Radiation. (PDQ)–Patient Version - NCI. May 23, 2022. Accessed February 24, 2023 at:  https://www.cancer.gov/about-cancer/treatment/side-effects/mouth-throat/oral-complications-pdq
  4. Oğuz A, Cetiner S, Karadeniz C, Alpaslan G, Alpaslan C, Pinarli G. Long-term effects of chemotherapy on orodental structures in children with non-Hodgkin's lymphoma. Eur J Oral Sci 2004; 112 (01) 8-11
    Crossref PubMed Search in Google Scholar

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