Table 1. Clam specimens and tissues sequenced with Illumina paired-ends.

Sixteen specimens (eight neoplastic and eight non-neoplastic) from three different clam species (V. verrucosa, C. gallina, and C. striatula) were sequenced with Illumina paired-ends. Columns 5 and 6 show the number of reads generated for the host tissue (when neoplastic, matched-normal tissue was foot) and the tumoural haemolymph, respectively. (*) denotes the only available tissue from this neoplastic animal, collected in 2011, were gills. (#) denotes hemic neoplasia stage was not determined because cytohistological examination was not possible in this individual, which was diagnosed by cytogenetics.

Clam species	Specimen origin	Specimen code	Diagnosis	Foot reads	Haemolymph reads
V. verrucosa	Galicia, Spain	ERVV17-2995	N3	833 M	919 M
V. verrucosa	Galicia, Spain	ERVV17-2997	N1	766 M	598 M
V. verrucosa	Galicia, Spain	ERVV17-3193	N3	739 M	850 M
V. verrucosa	Balearic Islands, Spain	EMVV18-376	N1	784 M	849 M
V. verrucosa	Balearic Islands, Spain	EMVV18-391	N3	617 M	623 M
V. verrucosa	Balearic Islands, Spain	EMVV18-395	N3	697 M	679 M
V. verrucosa	Balearic Islands, Spain	EMVV18-400	N1	782 M	1133 M
V. verrucosa	Galicia, Spain	EVVV11-02	N#	743 M*	–*
V. verrucosa	Split, Croatia	CSVV18-1052	Healthy	161 M	–
V. verrucosa	Balearic Islands, Spain	EMVV18-385	Healthy	143 M	–
V. verrucosa	Granville, France	FGVV18-183	Healthy	752 M	–
V. verrucosa	Carna, Ireland	IGVV19-666	Healthy	155 M	–
V. verrucosa	Oeiras, Portugal	PLVV18-2249	Healthy	163 M	–
C. gallina	S.Benedetto, Italy	IMCG15-69	Healthy	147 M	–
C. gallina	Cadiz, Spain	ECCG15-201	Healthy	752 M	–
C. striatula	Galicia, Spain	EVCS14-09	Healthy	706 M	–