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Year : 2020  |  Volume : 35  |  Issue : 3  |  Page : 248-250  

Rare case of docetaxel-induced myositis detected on fluorodeoxyglucose positron emission tomography/computed tomography in a patient with carcinoma breast


1 Department of Nuclear Medicine and PET-CT, Tata Main Hospital, Jamshedpur, Jharkhand, India
2 Department of Medical Oncology, Tata Main Hospital, Jamshedpur, Jharkhand, India

Date of Submission10-Feb-2020
Date of Acceptance23-Mar-2020
Date of Web Publication01-Jul-2020

Correspondence Address:
Dr. Girish Kumar Parida
Department of Nuclear Medicine and PET-CT, Tata Main Hospital, Jamshedpur - 831 001, Jharkhand
India
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/ijnm.IJNM_25_20

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   Abstract 


We report an extremely rare case of acute inflammatory myopathy during combination chemotherapy with docetaxel and transtuzumab for metastatic breast carcinoma in a 44-year-old female patient. Despite the significant response in the follow-up fluorodeoxyglucose (FDG) positron emission tomography/computed tomography, of the underlying malignancy to the chemotherapeutic regimen, there was diffusely increased FDG uptake in the upper and lower limb muscles with associated painful, proximal muscle weakness. These symptoms regressed after the discontinuation of docetaxel and the administration of corticosteroids, suggesting it to be the drug-induced myositis.

Keywords: Docetaxel, fluorodeoxyglucose positron emission tomography/computed tomography, myositis


How to cite this article:
Parida GK, Upadhyay A, Mitra S, Suman A, Muthu GS. Rare case of docetaxel-induced myositis detected on fluorodeoxyglucose positron emission tomography/computed tomography in a patient with carcinoma breast. Indian J Nucl Med 2020;35:248-50

How to cite this URL:
Parida GK, Upadhyay A, Mitra S, Suman A, Muthu GS. Rare case of docetaxel-induced myositis detected on fluorodeoxyglucose positron emission tomography/computed tomography in a patient with carcinoma breast. Indian J Nucl Med [serial online] 2020 [cited 2020 Aug 10];35:248-50. Available from: http://www.ijnm.in/text.asp?2020/35/3/248/288457



A 44-year-old woman, presented to our hospital with a right breast lump. Trucut biopsy from the right breast lump showed invasive mammary carcinoma, no special type (Ductal, not otherwise specified), Nottingham score 9, Grade III, with a hormonal status of estrogen receptor −ve, progesterone receptor −ve, and human epidermal growth factor receptor 2neu +ve. Staging work up showed, right breast mass along with right axillary and right internal mammary lymph nodes. Then, the patient received four cycles of epirubicin and cyclophosphamide. Interim positron emission tomography/computed tomography (PET/CT) showed [Figure 1]a- maximum intensity projection image] right breast mass [Figure 1]f and [Figure 1]g along with right axillary [Figure 1]d and [Figure 1]e, right supraclavicular [Figure 1]b and [Figure 1]c and mediastinal lymph nodal and presternal subcutaneous nodule metastases [Figure 1]f and [Figure 1]g. Following this the patient was put on docetaxel and transtuzumab and underwent another PET/CT after four cycles. This PET/CT showed near complete metabolic response to the therapy with only minimal residual right breast lesion [Figure 2]a, [Figure 2]d and [Figure 2]e. However, in addition to that, the PET/CT images showed diffusely increased fluorodeoxyglucose (FDG) uptake in the skeletal muscles predominantly around shoulder and hip girdles [Figure 2]a, [Figure 2]b, [Figure 2]c, [Figure 2]d, [Figure 2]e, [Figure 2]f, [Figure 2]g. The patient also had an associated history of muscle and joint pains with weakness involving bilateral upper and lower limbs, approximately 3 weeks after the starting of docetaxel, which progressed gradually after each cycle. In suspicion of docetaxel induced myositis, erythrocyte sedimentation rate (ESR), and creatine phosphokinase (CPK) was advised which were found out to be raised, 41 mm/h (normal <20 mm/h) and 395 u/l (normal range: 30–135 u/l), respectively. Hence, docetaxel was stopped, and the patient was put on tapered doses of prednisolone, to which she responded quickly. The ESR and CPK also came down to normal within a week. Instant response to corticosteroid and withdrawal of docetaxel, confirmed the diagnosis of docetaxel-induced myositis.
Figure 1: Interim positron emission tomography/computed tomography showed right breast mass along with right axillary, right supraclavicular and mediastinal lymph nodal and presternal subcutaneous nodule metastases (a) showing maximum intensity projection image and (b-g) showing fused positron emission tomography/computed tomography images and computed tomography images

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Figure 2: Follow-up positron emission tomography/computed tomography showed near complete metabolic response to the therapy with only minimal residual right breast lesion (a, d, e). Diffusely increased fluorodeoxyglucose uptake in the skeletal muscles predominantly around shoulder and hip girdles. (a) Showing maximum intensity projection and (b-g) showing fused positron emission tomography/computed tomography and computed tomography images of muscle uptake

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Docetaxel is a taxane-based chemotherapeutic agent that promotes the polymerization and inhibits depolymerization of microtubules causing interference of cell division. It has been widely used in breast, ovarian, refractory prostate, head and neck, gastric, and non-small cell lung cancers.[1] The common side effects of taxane agents include peripheral edema and fluid retention; however, it can also cause dose-dependent severe myelosuppression, most commonly neutropenia. Myalgia and neuropathies were not noted as common taxane side effects. There are few studies in the late 1980s to mid-1990s which reported peripheral neuropathy [2],[3],[4] and myalgias [5],[6],[7],[8],[9] as side effects. This side effect can be easily overlooked by physicians particularly in the setting of other existing causative factors. However, as it is treatable, we should have a higher index of suspicion when monitoring patients on taxane therapies. FDG PET-CT has already been used for different inflammatory myopathies which showed increased tracer uptake in the inflamed muscles.[10],[11],[12],[13],[14],[15] Hence, it is important for nuclear medicine physicians to be familiar with FDG PET-CT findings attributable to chemotherapy induced myositis so that an appropriate differential diagnosis can be established. Our case demonstrates a rare side effect of docetaxel on 18 F FDG PET/CT. These rarer side-effects may become more important in future clinical practice as the use of docetaxel increases.

Declaration of patient consent

The authors certify that they have obtained all appropriate patient consent forms. In the form the patient(s) has/have given his/her/their consent for his/her/their images and other clinical information to be reported in the journal. The patients understand that their names and initials will not be published and due efforts will be made to conceal their identity, but anonymity cannot be guaranteed.

Financial support and sponsorship

Nil.

Conflicts of interest

There are no conflicts of interest.



 
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